futtta / autoptimize

tests/test-ao.php

<?php

class AOTest extends WP_UnitTestcase
{
    /**
     * Plugin instance/fixture used in some tests.
     *
     * @var autoptimizeMain
     */
    protected $ao;

    protected static $flexible_url_parts_js = [
        'default'          => 'wp-content/cache/autoptimize/js/' . AUTOPTIMIZE_CACHEFILE_PREFIX,
        'custom'           => 'wp-content/c/ao/js/' . AUTOPTIMIZE_CACHEFILE_PREFIX,
        'multisite'        => 'wp-content/cache/autoptimize/1/js/' . AUTOPTIMIZE_CACHEFILE_PREFIX,
        'multisite_custom' => 'wp-content/c/ao/1/js/' . AUTOPTIMIZE_CACHEFILE_PREFIX,
    ];

    protected static $flexible_url_parts_css = [
        'default'          => 'wp-content/cache/autoptimize/css/' . AUTOPTIMIZE_CACHEFILE_PREFIX,
        'custom'           => 'wp-content/c/ao/css/' . AUTOPTIMIZE_CACHEFILE_PREFIX,
        'multisite'        => 'wp-content/cache/autoptimize/1/css/' . AUTOPTIMIZE_CACHEFILE_PREFIX,
        'multisite_custom' => 'wp-content/c/ao/1/css/' . AUTOPTIMIZE_CACHEFILE_PREFIX,
    ];

    protected function getAoStylesDefaultOptions()
    {
        $conf = autoptimizeConfig::instance();

        return [
            'aggregate'       => $conf->get( 'autoptimize_css_aggregate' ),
            'justhead'        => $conf->get( 'autoptimize_css_justhead' ),
            'datauris'        => $conf->get( 'autoptimize_css_datauris' ),
            'defer'           => $conf->get( 'autoptimize_css_defer' ),
            'defer_inline'    => $conf->get( 'autoptimize_css_defer_inline' ),
            'inline'          => $conf->get( 'autoptimize_css_inline' ),
            'css_exclude'     => $conf->get( 'autoptimize_css_exclude' ),
            'cdn_url'         => $conf->get( 'autoptimize_cdn_url' ),
            'include_inline'  => $conf->get( 'autoptimize_css_include_inline' ),
            'nogooglefont'    => $conf->get( 'autoptimize_css_nogooglefont' ),
            'minify_excluded' => $conf->get( 'autoptimize_minify_excluded' ),
        ];
    }

    protected function getAoScriptsDefaultOptions()
    {
        $conf = autoptimizeConfig::instance();

        return [
            'aggregate'           => $conf->get( 'autoptimize_js_aggregate' ),
            'defer_not_aggregate' => $conf->get( 'autoptimize_js_defer_not_aggregate' ),
            'justhead'            => $conf->get( 'autoptimize_js_justhead' ),
            'forcehead'           => $conf->get( 'autoptimize_js_forcehead' ),
            'trycatch'            => $conf->get( 'autoptimize_js_trycatch' ),
            'js_exclude'          => $conf->get( 'autoptimize_js_exclude' ),
            'cdn_url'             => $conf->get( 'autoptimize_cdn_url' ),
            'include_inline'      => $conf->get( 'autoptimize_js_include_inline' ),
            'minify_excluded'     => $conf->get( 'autoptimize_minify_excluded' ),
        ];
    }

    /**
     * @return array
     */
    protected function get_urls()
    {
        static $site_url = null;
        if ( null === $site_url ) {
            $site_url = site_url();
        }

        static $cdn_url = null;
        if ( null === $cdn_url ) {
            $cdn_url = autoptimizeOptionWrapper::get_option( 'autoptimize_cdn_url' );
        }

        static $imgopt_host = null;
        if ( null === $imgopt_host ) {
            $optimizer   = new autoptimizeImages();
            $imgopt_host = rtrim( $optimizer->get_imgopt_host(), '/' );
        }

        static $urls = [];

        if ( empty( $urls ) ) {
            $parts = autoptimizeUtils::get_ao_wp_site_url_parts();
            $urls  = [
                'siteurl'    => $site_url,
                'prsiteurl'  => '//' . str_replace( array( 'http://', 'https://' ), '', $site_url ),
                'wwwsiteurl' => $parts['scheme'] . '://www.' . str_replace( 'www.', '', $parts['host'] ),
                'cdnurl'     => $cdn_url,
                'imgopthost' => $imgopt_host,
                'subfolder'  => '',
            ];

            if ( AO_TEST_SUBFOLDER_INSTALL ) {
                $urls['subfolder'] = 'wordpress/';
            }
        }

        return $urls;
    }

    /**
     * Runs before each test method.
     */
    public function setUp()
    {
        $this->ao = new autoptimizeMain( AUTOPTIMIZE_PLUGIN_VERSION, AUTOPTIMIZE_PLUGIN_FILE );

        parent::setUp();
    }

    /**
     * Runs after each test method.
     */
    public function tearDown()
    {
        // Making sure certain filters are removed after each test to ensure isolation.
        $filter_tags = array(
            'autoptimize_filter_noptimize',
            'autoptimize_filter_base_cdnurl',
            'autoptimize_filter_css_is_datauri_candidate',
            'autoptimize_filter_css_datauri_image',
            'autoptimize_filter_css_inlinesize',
            'autoptimize_filter_css_fonts_cdn',
        );
        foreach ( $filter_tags as $filter_tag ) {
            remove_all_filters( $filter_tag );
        }

        parent::tearDown();
    }

    protected function get_test_markup()
    {
        $siteurl = $this->get_urls()['siteurl'];

        $markup = <<<MARKUP
<!DOCTYPE html>
<!--[if lt IE 7]> <html class="no-svg no-js lt-ie9 lt-ie8 lt-ie7"  xmlns:fb="https://www.facebook.com/2008/fbml"  xmlns:og="http://ogp.me/ns#" lang="hr"> <![endif]-->
<!--[if IE 7]> <html class="no-svg no-js lt-ie9 lt-ie8"  xmlns:fb="https://www.facebook.com/2008/fbml"  xmlns:og="http://ogp.me/ns#" lang="hr"> <![endif]-->
<!--[if IE 8]> <html class="no-svg no-js lt-ie9"  xmlns:fb="https://www.facebook.com/2008/fbml"  xmlns:og="http://ogp.me/ns#" lang="hr"> <![endif]-->
<!--[if gt IE 8]><!--> <html class="no-svg no-js"  xmlns:fb="https://www.facebook.com/2008/fbml"  xmlns:og="http://ogp.me/ns#" lang="hr"> <!--<![endif]-->
<head>
<meta charset="utf-8">
<title>Mliječna juha od brokule &#9832; Kuhaj.hr</title>
<meta name="viewport" content="width=device-width,initial-scale=1">
<style type="text/css">
/* cdn rewrite tests */

.bg { background:url('img/something.svg'); }
.bg-no-quote { background: url(img/something.svg); }
.bg-double-quotes { background: url("img/something.svg"); }

.whitespaces { background : url   (  "../../somewhere-else/svg.svg" ) ; }

.host-relative { background: url("/img/something.svg"); }
.protocol-relative { background: url("//something/somewhere/example.png"); }

/* roboto-100 - latin-ext_latin */
@font-face {
    font-family: 'Roboto';
    font-style: normal;
    font-weight: 100;
    src: url('../fonts/roboto-v15-latin-ext_latin-100.eot'); /* IE9 Compat Modes */
    src: local('Roboto Thin'), local('Roboto-Thin'),
        url('../fonts/roboto-v15-latin-ext_latin-100.eot?#iefix') format('embedded-opentype'), /* IE6-IE8 */
        url('../fonts/roboto-v15-latin-ext_latin-100.woff2') format('woff2'), /* Super Modern Browsers */
        url('../fonts/roboto-v15-latin-ext_latin-100.woff') format('woff'), /* Modern Browsers */
        url('../fonts/roboto-v15-latin-ext_latin-100.ttf') format('truetype'), /* Safari, Android, iOS */
        url('../fonts/roboto-v15-latin-ext_latin-100.svg#Roboto') format('svg'); /* Legacy iOS */
}
/* roboto-300 - latin-ext_latin */
@font-face {
    font-family: 'Roboto';
    font-style: normal;
    font-weight: 300;
    src: url('../fonts/roboto-v15-latin-ext_latin-300.eot'); /* IE9 Compat Modes */
    src: local('Roboto Light'), local('Roboto-Light'),
        url('../fonts/roboto-v15-latin-ext_latin-300.eot?#iefix') format('embedded-opentype'), /* IE6-IE8 */
        url('../fonts/roboto-v15-latin-ext_latin-300.woff2') format('woff2'), /* Super Modern Browsers */
        url('../fonts/roboto-v15-latin-ext_latin-300.woff') format('woff'), /* Modern Browsers */
        url('../fonts/roboto-v15-latin-ext_latin-300.ttf') format('truetype'), /* Safari, Android, iOS */
        url('../fonts/roboto-v15-latin-ext_latin-300.svg#Roboto') format('svg'); /* Legacy iOS */
}
/* roboto-regular - latin-ext_latin */
@font-face {
    font-family: 'Roboto';
    font-style: normal;
    font-weight: 400;
    src: url('../fonts/roboto-v15-latin-ext_latin-regular.eot'); /* IE9 Compat Modes */
    src: local('Roboto'), local('Roboto-Regular'),
        url('../fonts/roboto-v15-latin-ext_latin-regular.eot?#iefix') format('embedded-opentype'), /* IE6-IE8 */
        url('../fonts/roboto-v15-latin-ext_latin-regular.woff2') format('woff2'), /* Super Modern Browsers */
        url('../fonts/roboto-v15-latin-ext_latin-regular.woff') format('woff'), /* Modern Browsers */
        url('../fonts/roboto-v15-latin-ext_latin-regular.ttf') format('truetype'), /* Safari, Android, iOS */
        url('../fonts/roboto-v15-latin-ext_latin-regular.svg#Roboto') format('svg'); /* Legacy iOS */
}
/* roboto-500 - latin-ext_latin */
@font-face {
    font-family: 'Roboto';
    font-style: normal;
    font-weight: 500;
    src: url('../fonts/roboto-v15-latin-ext_latin-500.eot'); /* IE9 Compat Modes */
    src: local('Roboto Medium'), local('Roboto-Medium'),
        url('../fonts/roboto-v15-latin-ext_latin-500.eot?#iefix') format('embedded-opentype'), /* IE6-IE8 */
        url('../fonts/roboto-v15-latin-ext_latin-500.woff2') format('woff2'), /* Super Modern Browsers */
        url('../fonts/roboto-v15-latin-ext_latin-500.woff') format('woff'), /* Modern Browsers */
        url('../fonts/roboto-v15-latin-ext_latin-500.ttf') format('truetype'), /* Safari, Android, iOS */
        url('../fonts/roboto-v15-latin-ext_latin-500.svg#Roboto') format('svg'); /* Legacy iOS */
}
</style>
    <!--[if lt IE 9]>
    <script src="$siteurl/wp-content/themes/my-theme/js/vendor/html5shiv-printshiv.min.js" type="text/javascript"></script>
    <![endif]-->
    <!--[if (gte IE 6)&(lte IE 8)]>
        <script type="text/javascript" src="$siteurl/wp-content/themes/my-theme/js/vendor/respond.min.js"></script>
    <![endif]-->
<link rel='stylesheet' href='https://cdn.jsdelivr.net/npm/slick-carousel@1.8.1/slick/slick.css'>
<link rel='stylesheet' media='print' href='https://justsome.url/print.css'>
</head>

<body class="single single-post">

    <div id="fb-root"></div>
    <script>(function(d, s, id) {
        var js, fjs = d.getElementsByTagName(s)[0];
        if (d.getElementById(id)) return;
        js = d.createElement(s); js.id = id;
        js.src = "//connect.facebook.net/hr_HR/sdk.js#version=v2.0&xfbml=1&appId=";
        fjs.parentNode.insertBefore(js, fjs);
    }(document, 'script', 'facebook-jssdk'));</script>
    </script>

<script type='text/javascript' src='$siteurl/wp-content/plugins/ajax-load-more/core/js/ajax-load-more.min.js?ver=1.1'></script>
<script type='text/javascript' src='$siteurl/wp-content/plugins/wp-ga-social-tracking-js/ga-social-tracking.min.js'></script>
<script type='text/javascript' src='$siteurl/wp-content/themes/my-theme/js/vendor/alm-seo.js'></script>
<script type='text/javascript' src='$siteurl/wp-content/themes/my-theme/js/vendor/jquery.placeholder-2.1.1.min.js'></script>
<script type='text/javascript' src='$siteurl/wp-content/themes/my-theme/js/vendor/typeahead.bundle.min.js'></script>
<script type='text/javascript' src='$siteurl/wp-content/themes/my-theme/js/vendor/bootstrap-tagsinput.min.js'></script>
<script type='text/javascript' src='$siteurl/wp-content/themes/my-theme/js/m-mobilemenu.js'></script>
<script type='text/javascript' src='$siteurl/wp-content/themes/my-theme/js/main.js'></script>
<script type='text/javascript' src='$siteurl/wp-includes/js/comment-reply.min.js?ver=4.1.1'></script>
</body>
</html>
MARKUP;

        return $markup;
    }

    protected function get_test_markup_output()

This method seems to be duplicated in your project.

    {
        $key = 'default';
        if ( defined( 'CUSTOM_CONSTANTS_USED' ) && CUSTOM_CONSTANTS_USED ) {
            $key = 'custom';
        }

        $csspart = self::$flexible_url_parts_css[ $key ];
        $jspart  = self::$flexible_url_parts_js[ $key ];

        $csshash = '863f587e89f100b0223ddccc0dabc57a';
        if ( AO_TEST_SUBFOLDER_INSTALL ) {
            $csshash = '56398de576d59887e88e3011715250e0';
        }

        $urls      = $this->get_urls();
            $siteurl   = $urls['siteurl'];
        $cdnurl    = $urls['cdnurl'];
        $subfolder = $urls['subfolder'];

        $markup = <<<MARKUP
<!DOCTYPE html>
<!--[if lt IE 7]> <html class="no-svg no-js lt-ie9 lt-ie8 lt-ie7"  xmlns:fb="https://www.facebook.com/2008/fbml"  xmlns:og="http://ogp.me/ns#" lang="hr"> <![endif]-->
<!--[if IE 7]> <html class="no-svg no-js lt-ie9 lt-ie8"  xmlns:fb="https://www.facebook.com/2008/fbml"  xmlns:og="http://ogp.me/ns#" lang="hr"> <![endif]-->
<!--[if IE 8]> <html class="no-svg no-js lt-ie9"  xmlns:fb="https://www.facebook.com/2008/fbml"  xmlns:og="http://ogp.me/ns#" lang="hr"> <![endif]-->
<!--[if gt IE 8]><!--> <html class="no-svg no-js"  xmlns:fb="https://www.facebook.com/2008/fbml"  xmlns:og="http://ogp.me/ns#" lang="hr"> <!--<![endif]-->
<head>
<meta charset="utf-8">
<link media="all" href="${cdnurl}/${subfolder}${csspart}${csshash}.css" rel="stylesheet" /><title>Mliječna juha od brokule &#9832; Kuhaj.hr</title>
<meta name="viewport" content="width=device-width,initial-scale=1">

    <!--[if lt IE 9]>
    <script src="$siteurl/wp-content/themes/my-theme/js/vendor/html5shiv-printshiv.min.js" type="text/javascript"></script>
    <![endif]-->
    <!--[if (gte IE 6)&(lte IE 8)]>
        <script type="text/javascript" src="$siteurl/wp-content/themes/my-theme/js/vendor/respond.min.js"></script>
    <![endif]-->
<link rel='stylesheet' href='https://cdn.jsdelivr.net/npm/slick-carousel@1.8.1/slick/slick.css'>
<link rel='stylesheet' media='print' href='https://justsome.url/print.css'>
</head>

<body class="single single-post">

    <div id="fb-root"></div>
    <script>(function(d, s, id) {
        var js, fjs = d.getElementsByTagName(s)[0];
        if (d.getElementById(id)) return;
        js = d.createElement(s); js.id = id;
        js.src = "//connect.facebook.net/hr_HR/sdk.js#version=v2.0&xfbml=1&appId=";
        fjs.parentNode.insertBefore(js, fjs);
    }(document, 'script', 'facebook-jssdk'));</script>
    </script>

<script type='text/javascript' src='$siteurl/wp-content/plugins/ajax-load-more/core/js/ajax-load-more.min.js?ver=1.1'></script>
<script type='text/javascript' src='$siteurl/wp-content/plugins/wp-ga-social-tracking-js/ga-social-tracking.min.js'></script>
<script type='text/javascript' src='$siteurl/wp-content/themes/my-theme/js/vendor/alm-seo.js'></script>
<script type='text/javascript' src='$siteurl/wp-content/themes/my-theme/js/vendor/jquery.placeholder-2.1.1.min.js'></script>
<script type='text/javascript' src='$siteurl/wp-content/themes/my-theme/js/vendor/typeahead.bundle.min.js'></script>
<script type='text/javascript' src='$siteurl/wp-content/themes/my-theme/js/vendor/bootstrap-tagsinput.min.js'></script>
<script type='text/javascript' src='$siteurl/wp-content/themes/my-theme/js/m-mobilemenu.js'></script>
<script type='text/javascript' src='$siteurl/wp-content/themes/my-theme/js/main.js'></script>

<script defer src="$cdnurl/${subfolder}${jspart}2d6e668fad0726747cb413ac61486ee0.js"></script></body>
</html>
MARKUP;

        return $markup;
    }

    protected function get_test_markup_output_ms()

This method seems to be duplicated in your project.

    {
        $key = 'multisite';
        if ( defined( 'CUSTOM_CONSTANTS_USED' ) && CUSTOM_CONSTANTS_USED ) {
            $key = 'multisite_custom';
        }

        $csspart = self::$flexible_url_parts_css[ $key ];
        $jspart  = self::$flexible_url_parts_js[ $key ];

        $csshash = '863f587e89f100b0223ddccc0dabc57a';
        if ( AO_TEST_SUBFOLDER_INSTALL ) {
            $csshash = '56398de576d59887e88e3011715250e0';
        }

        $urls      = $this->get_urls();
        $siteurl   = $urls['siteurl'];
        $cdnurl    = $urls['cdnurl'];
        $subfolder = $urls['subfolder'];

        $markup = <<<MARKUP
<!DOCTYPE html>
<!--[if lt IE 7]> <html class="no-svg no-js lt-ie9 lt-ie8 lt-ie7"  xmlns:fb="https://www.facebook.com/2008/fbml"  xmlns:og="http://ogp.me/ns#" lang="hr"> <![endif]-->
<!--[if IE 7]> <html class="no-svg no-js lt-ie9 lt-ie8"  xmlns:fb="https://www.facebook.com/2008/fbml"  xmlns:og="http://ogp.me/ns#" lang="hr"> <![endif]-->
<!--[if IE 8]> <html class="no-svg no-js lt-ie9"  xmlns:fb="https://www.facebook.com/2008/fbml"  xmlns:og="http://ogp.me/ns#" lang="hr"> <![endif]-->
<!--[if gt IE 8]><!--> <html class="no-svg no-js"  xmlns:fb="https://www.facebook.com/2008/fbml"  xmlns:og="http://ogp.me/ns#" lang="hr"> <!--<![endif]-->
<head>
<meta charset="utf-8">
<link media="all" href="$cdnurl/${subfolder}${csspart}${csshash}.css" rel="stylesheet" /><title>Mliječna juha od brokule &#9832; Kuhaj.hr</title>
<meta name="viewport" content="width=device-width,initial-scale=1">

    <!--[if lt IE 9]>
    <script src="$siteurl/wp-content/themes/my-theme/js/vendor/html5shiv-printshiv.min.js" type="text/javascript"></script>
    <![endif]-->
    <!--[if (gte IE 6)&(lte IE 8)]>
        <script type="text/javascript" src="$siteurl/wp-content/themes/my-theme/js/vendor/respond.min.js"></script>
    <![endif]-->
<link rel='stylesheet' href='https://cdn.jsdelivr.net/npm/slick-carousel@1.8.1/slick/slick.css'>
<link rel='stylesheet' media='print' href='https://justsome.url/print.css'>
</head>

<body class="single single-post">

    <div id="fb-root"></div>
    <script>(function(d, s, id) {
        var js, fjs = d.getElementsByTagName(s)[0];
        if (d.getElementById(id)) return;
        js = d.createElement(s); js.id = id;
        js.src = "//connect.facebook.net/hr_HR/sdk.js#version=v2.0&xfbml=1&appId=";
        fjs.parentNode.insertBefore(js, fjs);
    }(document, 'script', 'facebook-jssdk'));</script>
    </script>

<script type='text/javascript' src='$siteurl/wp-content/plugins/ajax-load-more/core/js/ajax-load-more.min.js?ver=1.1'></script>
<script type='text/javascript' src='$siteurl/wp-content/plugins/wp-ga-social-tracking-js/ga-social-tracking.min.js'></script>
<script type='text/javascript' src='$siteurl/wp-content/themes/my-theme/js/vendor/alm-seo.js'></script>
<script type='text/javascript' src='$siteurl/wp-content/themes/my-theme/js/vendor/jquery.placeholder-2.1.1.min.js'></script>
<script type='text/javascript' src='$siteurl/wp-content/themes/my-theme/js/vendor/typeahead.bundle.min.js'></script>
<script type='text/javascript' src='$siteurl/wp-content/themes/my-theme/js/vendor/bootstrap-tagsinput.min.js'></script>
<script type='text/javascript' src='$siteurl/wp-content/themes/my-theme/js/m-mobilemenu.js'></script>
<script type='text/javascript' src='$siteurl/wp-content/themes/my-theme/js/main.js'></script>

<script defer src="$cdnurl/${subfolder}${jspart}2d6e668fad0726747cb413ac61486ee0.js"></script></body>
</html>
MARKUP;

        return $markup;
    }

    protected function get_test_markup_output_inline_defer()

This method seems to be duplicated in your project.

    {
        $key = 'default';
        if ( defined( 'CUSTOM_CONSTANTS_USED' ) && CUSTOM_CONSTANTS_USED ) {
            $key = 'custom';
        }

        $csspart = self::$flexible_url_parts_css[ $key ];
        $jspart  = self::$flexible_url_parts_js[ $key ];

        $csshash = '863f587e89f100b0223ddccc0dabc57a';
        if ( AO_TEST_SUBFOLDER_INSTALL ) {
            $csshash = '56398de576d59887e88e3011715250e0';
        }

        $urls      = $this->get_urls();
        $siteurl   = $urls['siteurl'];
        $cdnurl    = $urls['cdnurl'];
        $subfolder = $urls['subfolder'];

        $markup = <<<MARKUP
<!DOCTYPE html>
<!--[if lt IE 7]> <html class="no-svg no-js lt-ie9 lt-ie8 lt-ie7"  xmlns:fb="https://www.facebook.com/2008/fbml"  xmlns:og="http://ogp.me/ns#" lang="hr"> <![endif]-->
<!--[if IE 7]> <html class="no-svg no-js lt-ie9 lt-ie8"  xmlns:fb="https://www.facebook.com/2008/fbml"  xmlns:og="http://ogp.me/ns#" lang="hr"> <![endif]-->
<!--[if IE 8]> <html class="no-svg no-js lt-ie9"  xmlns:fb="https://www.facebook.com/2008/fbml"  xmlns:og="http://ogp.me/ns#" lang="hr"> <![endif]-->
<!--[if gt IE 8]><!--> <html class="no-svg no-js"  xmlns:fb="https://www.facebook.com/2008/fbml"  xmlns:og="http://ogp.me/ns#" lang="hr"> <!--<![endif]-->
<head>
<meta charset="utf-8">
<style id="aoatfcss" media="all">1</style><link rel="stylesheet" media="print" href="$cdnurl/${subfolder}${csspart}{$csshash}.css" onload="this.onload=null;this.media='all';" /><noscript id="aonoscrcss"><link media="all" href="$cdnurl/${subfolder}${csspart}${csshash}.css" rel="stylesheet" /></noscript><title>Mliječna juha od brokule &#9832; Kuhaj.hr</title>
<meta name="viewport" content="width=device-width,initial-scale=1">

    <!--[if lt IE 9]>
    <script src="$siteurl/wp-content/themes/my-theme/js/vendor/html5shiv-printshiv.min.js" type="text/javascript"></script>
    <![endif]-->
    <!--[if (gte IE 6)&(lte IE 8)]>
        <script type="text/javascript" src="$siteurl/wp-content/themes/my-theme/js/vendor/respond.min.js"></script>
    <![endif]-->
<noscript><link media='all' rel='stylesheet' href='https://cdn.jsdelivr.net/npm/slick-carousel@1.8.1/slick/slick.css'></noscript><link media='print' onload="this.onload=null;this.media='all';" rel='stylesheet' href='https://cdn.jsdelivr.net/npm/slick-carousel@1.8.1/slick/slick.css'>
<link rel='stylesheet' media='print' href='https://justsome.url/print.css'>
</head>

<body class="single single-post">

    <div id="fb-root"></div>
    <script>(function(d, s, id) {
        var js, fjs = d.getElementsByTagName(s)[0];
        if (d.getElementById(id)) return;
        js = d.createElement(s); js.id = id;
        js.src = "//connect.facebook.net/hr_HR/sdk.js#version=v2.0&xfbml=1&appId=";
        fjs.parentNode.insertBefore(js, fjs);
    }(document, 'script', 'facebook-jssdk'));</script>
    </script>

<script type='text/javascript' src='$siteurl/wp-content/plugins/ajax-load-more/core/js/ajax-load-more.min.js?ver=1.1'></script>
<script type='text/javascript' src='$siteurl/wp-content/plugins/wp-ga-social-tracking-js/ga-social-tracking.min.js'></script>
<script type='text/javascript' src='$siteurl/wp-content/themes/my-theme/js/vendor/alm-seo.js'></script>
<script type='text/javascript' src='$siteurl/wp-content/themes/my-theme/js/vendor/jquery.placeholder-2.1.1.min.js'></script>
<script type='text/javascript' src='$siteurl/wp-content/themes/my-theme/js/vendor/typeahead.bundle.min.js'></script>
<script type='text/javascript' src='$siteurl/wp-content/themes/my-theme/js/vendor/bootstrap-tagsinput.min.js'></script>
<script type='text/javascript' src='$siteurl/wp-content/themes/my-theme/js/m-mobilemenu.js'></script>
<script type='text/javascript' src='$siteurl/wp-content/themes/my-theme/js/main.js'></script>

<script defer src="$cdnurl/${subfolder}${jspart}2d6e668fad0726747cb413ac61486ee0.js"></script></body>
</html>
MARKUP;

        return $markup;
    }

    protected function get_test_markup_output_inline_defer_ms()

This method seems to be duplicated in your project.

    {
        $key = 'multisite';
        if ( defined( 'CUSTOM_CONSTANTS_USED' ) && CUSTOM_CONSTANTS_USED ) {
            $key = 'multisite_custom';
        }

        $csspart = self::$flexible_url_parts_css[ $key ];
        $jspart  = self::$flexible_url_parts_js[ $key ];

        $csshash = '863f587e89f100b0223ddccc0dabc57a';
        if ( AO_TEST_SUBFOLDER_INSTALL ) {
            $csshash = '56398de576d59887e88e3011715250e0';
        }

        $urls      = $this->get_urls();
        $siteurl   = $urls['siteurl'];
        $cdnurl    = $urls['cdnurl'];
        $subfolder = $urls['subfolder'];

        $markup = <<<MARKUP
<!DOCTYPE html>
<!--[if lt IE 7]> <html class="no-svg no-js lt-ie9 lt-ie8 lt-ie7"  xmlns:fb="https://www.facebook.com/2008/fbml"  xmlns:og="http://ogp.me/ns#" lang="hr"> <![endif]-->
<!--[if IE 7]> <html class="no-svg no-js lt-ie9 lt-ie8"  xmlns:fb="https://www.facebook.com/2008/fbml"  xmlns:og="http://ogp.me/ns#" lang="hr"> <![endif]-->
<!--[if IE 8]> <html class="no-svg no-js lt-ie9"  xmlns:fb="https://www.facebook.com/2008/fbml"  xmlns:og="http://ogp.me/ns#" lang="hr"> <![endif]-->
<!--[if gt IE 8]><!--> <html class="no-svg no-js"  xmlns:fb="https://www.facebook.com/2008/fbml"  xmlns:og="http://ogp.me/ns#" lang="hr"> <!--<![endif]-->
<head>
<meta charset="utf-8">
<style id="aoatfcss" media="all">1</style><link rel="stylesheet" media="print" href="$cdnurl/${subfolder}${csspart}${csshash}.css" onload="this.onload=null;this.media='all';" /><noscript id="aonoscrcss"><link media="all" href="$cdnurl/${subfolder}${csspart}${csshash}.css" rel="stylesheet" /></noscript><title>Mliječna juha od brokule &#9832; Kuhaj.hr</title>
<meta name="viewport" content="width=device-width,initial-scale=1">

    <!--[if lt IE 9]>
    <script src="$siteurl/wp-content/themes/my-theme/js/vendor/html5shiv-printshiv.min.js" type="text/javascript"></script>
    <![endif]-->
    <!--[if (gte IE 6)&(lte IE 8)]>
        <script type="text/javascript" src="$siteurl/wp-content/themes/my-theme/js/vendor/respond.min.js"></script>
    <![endif]-->
<noscript><link media='all' rel='stylesheet' href='https://cdn.jsdelivr.net/npm/slick-carousel@1.8.1/slick/slick.css'></noscript><link media='print' onload="this.onload=null;this.media='all';" rel='stylesheet' href='https://cdn.jsdelivr.net/npm/slick-carousel@1.8.1/slick/slick.css'>
<link rel='stylesheet' media='print' href='https://justsome.url/print.css'>
</head>

<body class="single single-post">

    <div id="fb-root"></div>
    <script>(function(d, s, id) {
        var js, fjs = d.getElementsByTagName(s)[0];
        if (d.getElementById(id)) return;
        js = d.createElement(s); js.id = id;
        js.src = "//connect.facebook.net/hr_HR/sdk.js#version=v2.0&xfbml=1&appId=";
        fjs.parentNode.insertBefore(js, fjs);
    }(document, 'script', 'facebook-jssdk'));</script>
    </script>

<script type='text/javascript' src='$siteurl/wp-content/plugins/ajax-load-more/core/js/ajax-load-more.min.js?ver=1.1'></script>
<script type='text/javascript' src='$siteurl/wp-content/plugins/wp-ga-social-tracking-js/ga-social-tracking.min.js'></script>
<script type='text/javascript' src='$siteurl/wp-content/themes/my-theme/js/vendor/alm-seo.js'></script>
<script type='text/javascript' src='$siteurl/wp-content/themes/my-theme/js/vendor/jquery.placeholder-2.1.1.min.js'></script>
<script type='text/javascript' src='$siteurl/wp-content/themes/my-theme/js/vendor/typeahead.bundle.min.js'></script>
<script type='text/javascript' src='$siteurl/wp-content/themes/my-theme/js/vendor/bootstrap-tagsinput.min.js'></script>
<script type='text/javascript' src='$siteurl/wp-content/themes/my-theme/js/m-mobilemenu.js'></script>
<script type='text/javascript' src='$siteurl/wp-content/themes/my-theme/js/main.js'></script>

<script defer src="$cdnurl/${subfolder}${jspart}2d6e668fad0726747cb413ac61486ee0.js"></script></body>
</html>
MARKUP;

        return $markup;
    }

    /**
     * @dataProvider provider_test_rewrite_markup_with_cdn
     */
    function test_rewrite_markup_with_cdn( $input, $expected )
    {
        $actual = $this->ao->end_buffering( $input );

        $this->assertEquals( $expected, $actual );
    }

    public function provider_test_rewrite_markup_with_cdn()
    {
        return array(

            array(
                // Input.
                $this->get_test_markup(),
                // Expected output.
                // TODO/FIXME: This seemed like the fastest way to get MS crude test to pass...
                ( is_multisite() ? $this->get_test_markup_output_ms() : $this->get_test_markup_output() ),
            ),

        );
    }

    public function test_rewrite_css_assets()
    {
        $urls   = $this->get_urls();
        $cdnurl = $urls['cdnurl'];
        $sub    = $urls['subfolder'];

        $css_in = <<<CSS
.bg { background:url('img/something.svg'); }
.bg-no-quote { background: url(img/something.svg); }
.bg-double-quotes { background: url("img/something.svg"); }

.whitespaces { background : url   (  "../../somewhere-else/svg.svg" ) ; }

.host-relative { background: url("/img/something.svg"); }
.protocol-relative { background: url("//something/somewhere/example.png"); }

@font-face {
  font-family: 'Roboto';
  font-style: normal;
  font-weight: 100;
  src: url('../fonts/roboto-v15-latin-ext_latin-100.eot'); /* IE9 Compat Modes */
  src: local('Roboto Thin'), local('Roboto-Thin'),
       url('../fonts/roboto-v15-latin-ext_latin-100.eot?#iefix') format('embedded-opentype'), /* IE6-IE8 */
       url('../fonts/roboto-v15-latin-ext_latin-100.woff2') format('woff2'), /* Super Modern Browsers */
       url('../fonts/roboto-v15-latin-ext_latin-100.woff') format('woff'), /* Modern Browsers */
       url('../fonts/roboto-v15-latin-ext_latin-100.ttf') format('truetype'), /* Safari, Android, iOS */
       url('../fonts/roboto-v15-latin-ext_latin-100.svg#Roboto') format('svg'); /* Legacy iOS */
}
CSS;

        $css_expected = <<<CSS
.bg { background:url(img/something.svg); }
.bg-no-quote { background: url(img/something.svg); }
.bg-double-quotes { background: url(img/something.svg); }

.whitespaces { background : url   (  ../../somewhere-else/svg.svg) ; }

.host-relative { background: url(${cdnurl}/${sub}img/something.svg); }
.protocol-relative { background: url(//something/somewhere/example.png); }

@font-face {
  font-family: 'Roboto';
  font-style: normal;
  font-weight: 100;
  src: url('../fonts/roboto-v15-latin-ext_latin-100.eot'); /* IE9 Compat Modes */
  src: local('Roboto Thin'), local('Roboto-Thin'),
       url('../fonts/roboto-v15-latin-ext_latin-100.eot?#iefix') format('embedded-opentype'), /* IE6-IE8 */
       url('../fonts/roboto-v15-latin-ext_latin-100.woff2') format('woff2'), /* Super Modern Browsers */
       url('../fonts/roboto-v15-latin-ext_latin-100.woff') format('woff'), /* Modern Browsers */
       url('../fonts/roboto-v15-latin-ext_latin-100.ttf') format('truetype'), /* Safari, Android, iOS */
       url('../fonts/roboto-v15-latin-ext_latin-100.svg#Roboto') format('svg'); /* Legacy iOS */
}
CSS;

        $instance = new autoptimizeStyles( $css_in );
        $instance->setOption( 'cdn_url', $cdnurl );

        $css_actual = $instance->rewrite_assets( $css_in );

        $this->assertEquals( $css_expected, $css_actual );
    }

    public function test_default_cssmin_minifier()

This method seems to be duplicated in your project.

    {
        $css = <<<CSS
.bg { background:url('img/something.svg'); }
.bg-no-quote { background: url(img/something.svg); }
.bg-double-quotes { background: url("img/something.svg"); }

.whitespaces { background : url   (  "../../somewhere-else/svg.svg" ) ; }

.host-relative { background: url("/img/something.svg"); }
.protocol-relative { background: url("//something/somewhere/example.png"); }

/* roboto-100 - latin-ext_latin */
@font-face {
  font-family: 'Roboto';
  font-style: normal;
  font-weight: 100;
  src: url(../fonts/roboto-v15-latin-ext_latin-100.eot); /* IE9 Compat Modes */
  src: local('Roboto Thin'), local('Roboto-Thin'),
       url(../fonts/roboto-v15-latin-ext_latin-100.eot?#iefix) format('embedded-opentype'), /* IE6-IE8 */
       url(../fonts/roboto-v15-latin-ext_latin-100.woff2) format('woff2'), /* Super Modern Browsers */
       url(../fonts/roboto-v15-latin-ext_latin-100.woff) format('woff'), /* Modern Browsers */
       url(../fonts/roboto-v15-latin-ext_latin-100.ttf) format('truetype'), /* Safari, Android, iOS */
       url(../fonts/roboto-v15-latin-ext_latin-100.svg#Roboto) format('svg'); /* Legacy iOS */
}
CSS;

        $expected = <<<CSS
.bg{background:url('img/something.svg')}.bg-no-quote{background:url(img/something.svg)}.bg-double-quotes{background:url("img/something.svg")}.whitespaces{background:url ("../../somewhere-else/svg.svg")}.host-relative{background:url("/img/something.svg")}.protocol-relative{background:url("//something/somewhere/example.png")}@font-face{font-family:'Roboto';font-style:normal;font-weight:100;src:url(../fonts/roboto-v15-latin-ext_latin-100.eot);src:local('Roboto Thin'),local('Roboto-Thin'),url(../fonts/roboto-v15-latin-ext_latin-100.eot?#iefix) format('embedded-opentype'),url(../fonts/roboto-v15-latin-ext_latin-100.woff2) format('woff2'),url(../fonts/roboto-v15-latin-ext_latin-100.woff) format('woff'),url(../fonts/roboto-v15-latin-ext_latin-100.ttf) format('truetype'),url(../fonts/roboto-v15-latin-ext_latin-100.svg#Roboto) format('svg')}
CSS;

        $instance = new autoptimizeStyles( $css );
        $minified = $instance->run_minifier_on( $css );

        $this->assertEquals( $expected, $minified );
    }

    /**
     * @dataProvider provider_test_should_aggregate_script_types
     */
    public function test_should_aggregate_script_types( $input, $expected )
    {
        $instance = new autoptimizeScripts( '' );
        $actual   = $instance->should_aggregate( $input );

        $this->assertEquals( $expected, $actual );
    }

    public function provider_test_should_aggregate_script_types()
    {
        return array(
            // No type attribute at all.
            array(
                // Input.
                '<script>var something=true</script>',
                // Expected output.
                true,
            ),
            // Case-insensitive.
            array(
                '<script type="text/ecmaScript">var something=true</script>',
                true,
            ),
            // Allowed/aggregated now (wasn't previously).
            array(
                '<script type="application/javascript">var something=true</script>',
                true,
            ),
            // Quotes shouldn't matter, nor should case-sensitivity.
            array(
                '<script type=\'text/JaVascriPt">var something=true</script>',
                true,
            ),
            // Liberal to whitespace around attribute names/values.
            array(
                '<script tYpe = text/javascript>var something=true</script>',
                true,
            ),
            // Something custom, should be ignored/skipped.
            array(
                '<script type=template/javascript>var something=true</script>',
                false,
            ),
            // Type attribute checking should be constrained to actual script
            // tag's type attribute only, regardless of any `type=` string
            // present in the actual inline script contents.
            array(
                // Since there's no type attribute, it should be aggregate by default.
                '<script>var type=something;</script>',
                true,
            ),
            // Application/ld+json should not be aggregated by default regardless
            // of spacing around attr/values.
            array(
                '<script type = "application/ld+json" >{   "@context": "" }',
                false,
            ),
            array(
                '<script type="application/ld+json">{   "@context": "" }',
                false,
            ),
        );
    }

    /**
     * @dataProvider provider_is_valid_buffer
     */
    public function test_valid_buffers( $input, $expected )
    {
        $actual = $this->ao->is_valid_buffer( $input );

        $this->assertEquals( $expected, $actual );
    }

    public function provider_is_valid_buffer()
    {
        return array(
            array(
                '<!doctype html>
<html ⚡>',
                false,
            ),
            array(
                '<!doctype html>
<html amp>',
                false,
            ),
            array(
                '<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">',
                false,
            ),
            array(
                // adding doctype & html tags to make sure that this is falsed by the extended has_xsl_stylesheet test.
                '<?xml version="2.0" encoding="UTF-8"?>
<!doctype html><html>
<?xml-stylesheet type="text/xsl" ',
                false,
            ),
            array(
                '<!doctype html>
<html>',
                true,
            ),
            array(
                '<html dir="ltr" amp>',
                false,
            ),
            array(
                '<html dir="ltr" ⚡>',
                false,
            ),
            array(
                '<html amp dir="ltr">',
                false,
            ),
            array(
                '<html ⚡ dir="ltr">',
                false,
            ),
            array(
                '<HTML ⚡ DIR="LTR">',
                false,
            ),
            array(
                '<HTML AMP DIR="LTR">',
                false,
            ),
            // @link https://github.com/futtta/autoptimize/commit/54385939db06f725fcafe68598cce6ed148ef6c1
            array(
                '<!doctype html>',
                true,
            ),
        );
    }

    /**
     * @dataProvider provider_is_amp_markup
     */
    public function test_autoptimize_is_amp_markup( $input, $expected )
    {
        $actual = autoptimizeMain::is_amp_markup( $input );

        $this->assertEquals( $expected, $actual );
    }

    public function provider_is_amp_markup()
    {
        return array(
            array(
                '<!doctype html>
<html ⚡>',
                true,
            ),
            array(
                '<!doctype html>
<html amp>',
                true,
            ),
            array(
                '<!doctype html>
<head>
<meta charset=utf-8>',
                false,
            ),
        );
    }

    /**
     * Test various conditions that can/should prevent autoptimize from buffering content.
     */
    public function test_skips_buffering_when_ao_noptimize_filter_is_true()

This method seems to be duplicated in your project.

    {
        // True => disable autoptimize.
        add_filter( 'autoptimize_filter_noptimize', '__return_true' );

        // Buffering should not run due to the above filter.
        $expected = false;
        $actual   = $this->ao->should_buffer( $doing_tests = true );

        $this->assertEquals( $expected, $actual );
    }

    public function test_does_buffering_when_ao_noptimize_filter_is_false()

This method seems to be duplicated in your project.

    {
        // False => disable noptimize, aka, run normally (weird, yes...).
        add_filter( 'autoptimize_filter_noptimize', '__return_false' );

        // Buffering should run because of above.
        $expected = true;
        $actual   = $this->ao->should_buffer( $doing_tests = true );

        $this->assertEquals( $expected, $actual );
    }

    public function test_ignores_ao_noptimize_qs_when_instructed()
    {
        // Should skip checking for the qs completely due to filter.
        add_filter( 'autoptimize_filter_honor_qs_noptimize', '__return_false' );

        /**
         * The above should then result in the "current" value being `false`
         * when passed to 'autoptimize_filter_noptimize' unless the DONOTMINIFY
         * constant is defined, which changes the result... Which basically
         * means this test changes its' expected result depending on the order
         * of tests execution and/or the environment, which is AAAARGGGGGGHHH...
         */

        $that = $this; // Makes it work on php 5.3!
        add_filter( 'autoptimize_filter_noptimize', function ( $current_value ) use ( $that ) {
            $expected = false;
            if ( defined( 'DONOTMINIFY' ) && DONOTMINIFY ) {
                $expected = true;
            }

            $that->assertEquals( $expected, $current_value );
        });

        $this->ao->should_buffer( $doing_tests = true );
    }

    public function test_wpengine_cache_flush()
    {
        // Creating a mock so that we can get past class_exists() and method_exists() checks present
        // in `autoptimizeCache::flushPageCache()`...
        $stub = $this->getMockBuilder( 'WpeCommon' )->disableAutoload()

$stub is not used, you could remove the assignment.

                ->disableOriginalConstructor()->setMethods(
                    array(
                        'purge_varnish_cache',
                    )
                )
                ->getMock();

        $that = $this;
        add_filter( 'autoptimize_flush_wpengine_methods', function( $methods ) use ( $that ) {
            $expected_methods = array( 'purge_varnish_cache' );
            $that->assertEquals( $methods, $expected_methods );

            return $methods;
        });

        autoptimizeCache::flushPageCache();
    }

    /**
     * Tests the `autoptimize_flush_wpengine_aggressive` filter
     */
    public function test_wpengine_cache_flush_agressive()
    {
        // Creating a mock so that we can get past class_exists() and method_exists() checks `autoptimize_flush_pagecache()`...
        $stub = $this->getMockBuilder( 'WpeCommon' )->disableAutoload()

$stub is not used, you could remove the assignment.

                ->disableOriginalConstructor()->setMethods(
                    array(
                        'purge_varnish_cache',
                        'purge_memcached',
                        'clear_maxcdn_cache',
                    )
                )
                ->getMock();

        add_filter( 'autoptimize_flush_wpengine_aggressive', function() {
            return true;
        });

        $that = $this;
        add_filter( 'autoptimize_flush_wpengine_methods', function( $methods ) use ( $that ) {
            $expected_methods = array(
                'purge_varnish_cache',
                'purge_memcached',
                'clear_maxcdn_cache',
            );

            $that->assertEquals( $methods, $expected_methods );

            return $methods;
        });

        autoptimizeCache::flushPageCache();
    }

    /**
     * @dataProvider provider_test_url_replace_cdn
     */
    public function test_url_replace_cdn( $cdn_url, $input, $expected )
    {
        $mock = $this->getMockBuilder( 'autoptimizeBase' )
                ->disableOriginalConstructor()
                ->getMockForAbstractClass();

        $mock->cdn_url = $cdn_url;
        $actual        = $mock->url_replace_cdn( $input );
        $this->assertEquals( $expected, $actual );
    }

    public function provider_test_url_replace_cdn()
    {
        $urls                 = $this->get_urls();
        $siteurl              = $urls['siteurl'];
        $wwwsiteurl           = $urls['wwwsiteurl'];
        $protorelativesiteurl = $urls['prsiteurl'];
        $subfolder            = $urls['subfolder'];

        return array(
            // Host-relative links get properly transformed...
            array(
                // CDN base url, url, expected result...
                'http://cdn-test.example.org',
                '/a.jpg',
                'http://cdn-test.example.org/' . $subfolder . 'a.jpg',
            ),
            // Full link with a matching AUTOPTIMIZE_WP_SITE_URL gets properly replaced...
            array(
                'http://cdn-test.example.org',
                $siteurl . '/wp-content/themes/something/example.svg',
                'http://cdn-test.example.org/' . $subfolder . 'wp-content/themes/something/example.svg',
            ),
            // Protocol-relative url with a "local" hostname that doesn't match example.org (AUTOPTIMIZE_WP_SITE_URL)...
            array(
                'http://cdn-test.example.org',
                '//something/somewhere.jpg',
                '//something/somewhere.jpg',
            ),
            // www.example.org does not match example.org (AUTOPTIMIZE_WP_SITE_URL) so it's left alone...
            array(
                'http://cdn-test.example.org',
                $wwwsiteurl . '/wp-content/themes/something/example.svg',
                $wwwsiteurl . '/wp-content/themes/something/example.svg',
            ),
            // SSL cdn url + host-relative link...
            array(
                'https://cdn.example.org',
                '/a.jpg',
                'https://cdn.example.org/' . $subfolder . 'a.jpg',
            ),
            // SSL cdn url + http site url that matches AUTOPTIMIZE_WP_SITE_URL is properly replaced...
            array(
                'https://cdn.example.org',
                $siteurl . '/wp-content/themes/something/example.svg',
                'https://cdn.example.org/' . $subfolder . 'wp-content/themes/something/example.svg',
            ),
            // Protocol-relative cdn url given with protocol relative link that matches AUTOPTIMIZE_WP_SITE_URL host...
            array(
                '//cdn.example.org',
                $protorelativesiteurl . '/something.jpg',
                '//cdn.example.org/' . $subfolder . 'something.jpg',
            ),
            // Protocol-relative cdn url given a http link that matches AUTOPTIMIZE_WP_SITE_URL host...
            array(
                '//cdn.example.org',
                $siteurl . '/something.png',
                '//cdn.example.org/' . $subfolder . 'something.png',
            ),
            // Protocol-relative cdn url with a host-relative link...
            array(
                '//cdn.example.org',
                '/a.jpg',
                '//cdn.example.org/' . $subfolder . 'a.jpg',
            ),
            // Testing cdn urls with an explicit port number...
            array(
                'http://cdn.com:8080',
                '/a.jpg',
                'http://cdn.com:8080/' . $subfolder . 'a.jpg',
            ),
            array(
                '//cdn.com:4433',
                '/a.jpg',
                '//cdn.com:4433/' . $subfolder . 'a.jpg',
            ),
            array(
                '//cdn.com:4433',
                $siteurl . '/something.jpg',
                '//cdn.com:4433/' . $subfolder . 'something.jpg',
            ),
            array(
                '//cdn.com:1234',
                $protorelativesiteurl . '/something.jpg',
                '//cdn.com:1234/' . $subfolder . 'something.jpg',
            ),
            // Relative links should not be touched by url_replace_cdn()...
            array(
                // Base cdn url.
                'http://cdn-test.example.org',
                // Url.
                'a.jpg',
                // Expected result.
                'a.jpg',
            ),
            array(
                'http://cdn-test.example.org',
                './a.jpg',
                './a.jpg',
            ),
            array(
                'http://cdn-test.example.org',
                '../something/somewhere.svg',
                '../something/somewhere.svg',
            ),
            // These prove some weird combinations pre-2.4 remain working
            // even though they are really strange...
            array(
                $siteurl, // example.org or http://localhost or http://localhost/wordpress
                $siteurl . '/something.jpg',
                $siteurl . '/something.jpg',
            ),
            // These shouldn't really be changed, or even if replacements do
            // happen, they shouldn't be destructive...
            array(
                'http://localhost/wp',
                'http://localhost/wp/something.jpg',
                'http://localhost/wp/something.jpg',
            ),
            array(
                'http://localhost',
                'http://localhost/something.jpg',
                'http://localhost/something.jpg',
            ),
            array(
                'http://localhost',
                'http://localhost/wordpress/something.jpg',
                'http://localhost/wordpress/something.jpg',
            ),
            array(
                'http://localhost/wordpress',
                'http://localhost/wordpress/something.jpg',
                'http://localhost/wordpress/something.jpg',
            ),
        );
    }

    /**
     * Tests `autoptimize_filter_base_cdnurl` filtering as described here:
     * https://wordpress.org/support/topic/disable-cdn-of-ssl-pages
     */
    public function test_autoptimize_filter_base_cdnurl()
    {
        $urls = $this->get_urls();
        $sub  = $urls['subfolder'];

        $test_link = '/a.jpg';
        $cdn_url   = '//cdn.example.org';

        $with_ssl = function( $cdn ) {

The parameter $cdn is not used and could be removed.

            return '';
        };
        $expected_with_ssl = '/a.jpg';

        $without_ssl = function( $cdn ) {
            return $cdn;
        };
        $expected_without_ssl = '//cdn.example.org/' . $sub . 'a.jpg';

        // With a filter that returns something considered "empty", cdn replacement shouldn't occur...
        add_filter( 'autoptimize_filter_base_cdnurl', $with_ssl );
        $mock = $this->getMockBuilder( 'autoptimizeBase' )
                ->disableOriginalConstructor()
                ->getMockForAbstractClass();

        $mock->cdn_url   = $cdn_url;
        $actual_with_ssl = $mock->url_replace_cdn( $test_link );
        $this->assertEquals( $expected_with_ssl, $actual_with_ssl );
        remove_filter( 'autoptimize_filter_base_cdnurl', $with_ssl );

        // With a filter that returns an actual cdn url, cdn replacement should occur.
        add_filter( 'autoptimize_filter_base_cdnurl', $without_ssl );
        $actual_without_ssl = $mock->url_replace_cdn( $test_link );
        $this->assertEquals( $expected_without_ssl, $actual_without_ssl );
    }

    public function provider_cssmin_issues()
    {
        return array(
            // @link https://wordpress.org/support/topic/css-minify-breaks-calc-subtract-operation-in-css/?replies=2#post-6610027
            array(
                // Input.
                'input { width: calc(33.33333% - ((0.75em*2)/3)); }',
                // Expected output (ancient version of CSSmin returns 0.75, newer versions drop the 0).
                'input{width:calc(33.33333% - ((.75em*2)/3))}',
            ),
            // Actual examples from above, but original wasn't really valid
            // css input fully, but these tests used to work and we'd like to
            // know if output changes with various CSSmin versions, for
            // backcompat reasons if nothing else.
            array(
                // Input.
                'width: calc(33.33333% - ((0.75em*2)/3));',
                // Expected output.
                'width:calc(33.33333% - ((0.75em*2)/3));',
            ),
            // @link https://github.com/tubalmartin/YUI-CSS-compressor-PHP-port/issues/22#issuecomment-251401341
            array(
                'input { width: calc(100% - (1em*1.5) - 2em); }',
                'input{width:calc(100% - (1em*1.5) - 2em)}',
            ),
            // @link https://github.com/tubalmartin/YUI-CSS-compressor-PHP-port/issues/26
            array(
                '.px { flex: 1 1 0px; }, .percent {flex: 1 1 0%}',
                '.px{flex:1 1 0px},.percent{flex:1 1 0%}',
            ),
        );
    }

    /**
     * @dataProvider provider_cssmin_issues
     */
    public function test_cssmin_issues( $input, $expected )
    {
        $minifier = new autoptimizeCSSmin( false ); // No need to raise limits for now.
        $actual   = $minifier->run( $input );
        $this->assertEquals( $expected, $actual );
    }

    public function provider_getpath()
    {
        return array(
            /**
             * These all don't really exist, and getpath() returns false for
             * non-existing files since upstream's 1386e4fe1d commit.
             */
            array(
                'img/something.svg',
                false,
            ),
            array(
                '../../somewhere-else/svg.svg',
                false,
            ),
            array(
                '//something/somewhere/example.png',
                false,
            ),
            // This file comes with core, so should exist...
            array(
                '/wp-includes/js/jquery/jquery.js',
                WP_ROOT_DIR . '/wp-includes/js/jquery/jquery.js',
            ),
            // This file comes with core as of 5.6, so should exist...
            array(
                '/wp-includes/js/jquery/jquery.min.js',
                WP_ROOT_DIR . '/wp-includes/js/jquery/jquery.min.js',
            ),
            // Empty $url should return false.
            array(
                '',
                false,
            ),
            array(
                false,
                false,
            ),
            array(
                null,
                false,
            ),
            array(
                0,
                false,
            ),
        );
    }

    /**
     * @dataProvider provider_getpath
     */
    public function test_getpath( $input, $expected )
    {
        $mock = $this->getMockBuilder( 'autoptimizeBase' )->disableOriginalConstructor()->getMockForAbstractClass();

        $actual = $mock->getpath( $input );
        $this->assertEquals( $expected, $actual );
    }

    /**
     * @link https://github.com/futtta/autoptimize/pull/81#issuecomment-278935307
     */
    public function test_fixurls_with_hash_only_urls()
    {
        $urls      = $this->get_urls();
        $siteurl   = $urls['siteurl'];

$siteurl is not used, you could remove the assignment.

        $subfolder = $urls['subfolder'];

$subfolder is not used, you could remove the assignment.

        $protorelativesiteurl = $urls['prsiteurl'];

        $css_orig     = <<<CSS
header{background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='90px' height='110px' viewBox='0 0 90 110'%3E%3Cstyle%3E.a%7Bstop-color:%23FFF;%7D.b%7Bstop-color:%23B2D235;%7D.c%7Bstop-color:%23BEE7FA;%7D.d%7Bfill:%23590C15;%7D%3C/style%3E%3ClinearGradient id='c' y2='135.4' gradientUnits='userSpaceOnUse' x2='209.1' gradientTransform='rotate(-1.467 -4082.888 7786.794)' y1='205.8' x1='262'%3E%3Cstop class='b' offset='0'/%3E%3Cstop class='b' offset='.48'/%3E%3Cstop stop-color='%23829D25' offset='1'/%3E%3C/linearGradient%3E%3Cpath stroke-width='.3' d='M77.3 45.4c-3-3.5-7.1-6.5-11.6-7.8-5.1-1.5-10-.1-14.9 1.5C52 35.4 54.3 29 60 24l-4.8-5.5c-3.4 3-5.8 6.3-7.5 9.4-1.7-4.3-4.1-8.4-7.5-12C33.4 8.6 24.3 4.7 15.1 4.2c-.2 9.3 3.1 18.6 9.9 25.9 5.2 5.6 11.8 9.2 18.7 10.8-2.5.2-4.9-.1-7.7-.9-5.2-1.4-10.5-2.8-15.8-1C10.6 42.3 4.5 51.9 4 61.7c-.5 11.6 3.8 23.8 9.9 33.5 3.9 6.3 9.6 13.7 17.7 13.4 3.8-.1 7-2.1 10.7-2.7 5.2-.8 9.1 1.2 14.1 1.8 16.4 2 24.4-23.6 26.4-35.9 1.2-9.1.8-19.1-5.5-26.4z' stroke='%233E6D1F' fill='url(%23c)'/%3E%3C/svg%3E")}
section.clipped.clippedTop {clip-path:url("#clipPolygonTop")}
section.clipped.clippedBottom {clip-path:url("#clipPolygonBottom")}
.myimg {background-image: url("images/under-left-leaf.png"), url("images/over-blue-bird.png"), url("images/under-top.png"), url("images/bg-top-grunge.png");}
CSS;
        $css_expected = <<<CSS
header{background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='90px' height='110px' viewBox='0 0 90 110'%3E%3Cstyle%3E.a%7Bstop-color:%23FFF;%7D.b%7Bstop-color:%23B2D235;%7D.c%7Bstop-color:%23BEE7FA;%7D.d%7Bfill:%23590C15;%7D%3C/style%3E%3ClinearGradient id='c' y2='135.4' gradientUnits='userSpaceOnUse' x2='209.1' gradientTransform='rotate(-1.467 -4082.888 7786.794)' y1='205.8' x1='262'%3E%3Cstop class='b' offset='0'/%3E%3Cstop class='b' offset='.48'/%3E%3Cstop stop-color='%23829D25' offset='1'/%3E%3C/linearGradient%3E%3Cpath stroke-width='.3' d='M77.3 45.4c-3-3.5-7.1-6.5-11.6-7.8-5.1-1.5-10-.1-14.9 1.5C52 35.4 54.3 29 60 24l-4.8-5.5c-3.4 3-5.8 6.3-7.5 9.4-1.7-4.3-4.1-8.4-7.5-12C33.4 8.6 24.3 4.7 15.1 4.2c-.2 9.3 3.1 18.6 9.9 25.9 5.2 5.6 11.8 9.2 18.7 10.8-2.5.2-4.9-.1-7.7-.9-5.2-1.4-10.5-2.8-15.8-1C10.6 42.3 4.5 51.9 4 61.7c-.5 11.6 3.8 23.8 9.9 33.5 3.9 6.3 9.6 13.7 17.7 13.4 3.8-.1 7-2.1 10.7-2.7 5.2-.8 9.1 1.2 14.1 1.8 16.4 2 24.4-23.6 26.4-35.9 1.2-9.1.8-19.1-5.5-26.4z' stroke='%233E6D1F' fill='url(%23c)'/%3E%3C/svg%3E")}
section.clipped.clippedTop {clip-path:url("#clipPolygonTop")}
section.clipped.clippedBottom {clip-path:url("#clipPolygonBottom")}
.myimg {background-image: url($protorelativesiteurl/wp-content/themes/my-theme/images/under-left-leaf.png), url($protorelativesiteurl/wp-content/themes/my-theme/images/over-blue-bird.png), url($protorelativesiteurl/wp-content/themes/my-theme/images/under-top.png), url($protorelativesiteurl/wp-content/themes/my-theme/images/bg-top-grunge.png);}
CSS;

        $fixurls_result = autoptimizeStyles::fixurls( ABSPATH . 'wp-content/themes/my-theme/style.css', $css_orig );
        $this->assertEquals( $css_expected, $fixurls_result );
    }

    public function test_background_datauri_sprites_with_fixurls()
    {
        $css_orig     = <<<CSS
.shadow { background:url(img/1x1.png) top center; }
.shadow1 { background-image:url(img/1x1.png) 0 -767px repeat-x; }
.shadow2 {background:url(img/1x1.png) top center}

.test { background:url(img/1x1.png) top center; }
.test1 { background-image:url('img/1x1.png') 0 -767px repeat-x; }
.test2 {background:url("img/1x1.png") top center}

header{background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='90px' height='110px' viewBox='0 0 90 110'%3E%3Cstyle%3E.a%7Bstop-color:%23FFF;%7D.b%7Bstop-color:%23B2D235;%7D.c%7Bstop-color:%23BEE7FA;%7D.d%7Bfill:%23590C15;%7D%3C/style%3E%3ClinearGradient id='c' y2='135.4' gradientUnits='userSpaceOnUse' x2='209.1' gradientTransform='rotate(-1.467 -4082.888 7786.794)' y1='205.8' x1='262'%3E%3Cstop class='b' offset='0'/%3E%3Cstop class='b' offset='.48'/%3E%3Cstop stop-color='%23829D25' offset='1'/%3E%3C/linearGradient%3E%3Cpath stroke-width='.3' d='M77.3 45.4c-3-3.5-7.1-6.5-11.6-7.8-5.1-1.5-10-.1-14.9 1.5C52 35.4 54.3 29 60 24l-4.8-5.5c-3.4 3-5.8 6.3-7.5 9.4-1.7-4.3-4.1-8.4-7.5-12C33.4 8.6 24.3 4.7 15.1 4.2c-.2 9.3 3.1 18.6 9.9 25.9 5.2 5.6 11.8 9.2 18.7 10.8-2.5.2-4.9-.1-7.7-.9-5.2-1.4-10.5-2.8-15.8-1C10.6 42.3 4.5 51.9 4 61.7c-.5 11.6 3.8 23.8 9.9 33.5 3.9 6.3 9.6 13.7 17.7 13.4 3.8-.1 7-2.1 10.7-2.7 5.2-.8 9.1 1.2 14.1 1.8 16.4 2 24.4-23.6 26.4-35.9 1.2-9.1.8-19.1-5.5-26.4z' stroke='%233E6D1F' fill='url(%23c)'/%3E%3C/svg%3E")}

/*
section.clipped.clippedTop {clip-path:url("#clipPolygonTop")}
section.clipped.clippedBottom {clip-path:url("#clipPolygonBottom")}
.myimg {background-image: url("images/under-left-leaf.png"), url("images/over-blue-bird.png"), url("images/under-top.png"), url("images/bg-top-grunge.png");}
.something {
    background:url(http://example.org/wp-content/themes/my-theme/images/nothing.png);
}
.something-else {background:url(wp-content/themes/my-theme/images/shadow.png) -100px 0 repeat-y;}
.another-thing { background:url(/wp-content/themes/my-theme/images/shadow.png) 0 -767px repeat-x; }
#whatevz {background:url(wp-content/themes/my-theme/images/shadow.png) center top no-repeat;}

.widget ul li { background:url(img/shadow.png) top center; }
*/
CSS;
        $css_expected = <<<CSS
.shadow { background:url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mNkYAAAAAYAAjCB0C8AAAAASUVORK5CYII=) top center; }
.shadow1 { background-image:url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mNkYAAAAAYAAjCB0C8AAAAASUVORK5CYII=) 0 -767px repeat-x; }
.shadow2 {background:url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mNkYAAAAAYAAjCB0C8AAAAASUVORK5CYII=) top center}

.test { background:url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mNkYAAAAAYAAjCB0C8AAAAASUVORK5CYII=) top center; }
.test1 { background-image:url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mNkYAAAAAYAAjCB0C8AAAAASUVORK5CYII=) 0 -767px repeat-x; }
.test2 {background:url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mNkYAAAAAYAAjCB0C8AAAAASUVORK5CYII=) top center}

header{background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='90px' height='110px' viewBox='0 0 90 110'%3E%3Cstyle%3E.a%7Bstop-color:%23FFF;%7D.b%7Bstop-color:%23B2D235;%7D.c%7Bstop-color:%23BEE7FA;%7D.d%7Bfill:%23590C15;%7D%3C/style%3E%3ClinearGradient id='c' y2='135.4' gradientUnits='userSpaceOnUse' x2='209.1' gradientTransform='rotate(-1.467 -4082.888 7786.794)' y1='205.8' x1='262'%3E%3Cstop class='b' offset='0'/%3E%3Cstop class='b' offset='.48'/%3E%3Cstop stop-color='%23829D25' offset='1'/%3E%3C/linearGradient%3E%3Cpath stroke-width='.3' d='M77.3 45.4c-3-3.5-7.1-6.5-11.6-7.8-5.1-1.5-10-.1-14.9 1.5C52 35.4 54.3 29 60 24l-4.8-5.5c-3.4 3-5.8 6.3-7.5 9.4-1.7-4.3-4.1-8.4-7.5-12C33.4 8.6 24.3 4.7 15.1 4.2c-.2 9.3 3.1 18.6 9.9 25.9 5.2 5.6 11.8 9.2 18.7 10.8-2.5.2-4.9-.1-7.7-.9-5.2-1.4-10.5-2.8-15.8-1C10.6 42.3 4.5 51.9 4 61.7c-.5 11.6 3.8 23.8 9.9 33.5 3.9 6.3 9.6 13.7 17.7 13.4 3.8-.1 7-2.1 10.7-2.7 5.2-.8 9.1 1.2 14.1 1.8 16.4 2 24.4-23.6 26.4-35.9 1.2-9.1.8-19.1-5.5-26.4z' stroke='%233E6D1F' fill='url(%23c)'/%3E%3C/svg%3E")}

/*
section.clipped.clippedTop {clip-path:url("#clipPolygonTop")}
section.clipped.clippedBottom {clip-path:url("#clipPolygonBottom")}
.myimg {background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mNkYAAAAAYAAjCB0C8AAAAASUVORK5CYII=), url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mNkYAAAAAYAAjCB0C8AAAAASUVORK5CYII=), url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mNkYAAAAAYAAjCB0C8AAAAASUVORK5CYII=), url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mNkYAAAAAYAAjCB0C8AAAAASUVORK5CYII=);}
.something {
    background:url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mNkYAAAAAYAAjCB0C8AAAAASUVORK5CYII=);
}
.something-else {background:url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mNkYAAAAAYAAjCB0C8AAAAASUVORK5CYII=) -100px 0 repeat-y;}
.another-thing { background:url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mNkYAAAAAYAAjCB0C8AAAAASUVORK5CYII=) 0 -767px repeat-x; }
#whatevz {background:url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mNkYAAAAAYAAjCB0C8AAAAASUVORK5CYII=) center top no-repeat;}

.widget ul li { background:url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mNkYAAAAAYAAjCB0C8AAAAASUVORK5CYII=) top center; }
*/
CSS;

        // For test purposes, ALL images in the css are being inline with a 1x1 trans png string/datauri.
        add_filter( 'autoptimize_filter_css_is_datauri_candidate', function( $is_candidate, $path ) {

The parameter $is_candidate is not used and could be removed.

The parameter $path is not used and could be removed.

            return true;
        }, 10, 2 );

        // For test purposes, ALL images in the css are being inline with a 1x1 trans png string/datauri.
        add_filter( 'autoptimize_filter_css_datauri_image', function( $base64array, $path ) {

The parameter $base64array is not used and could be removed.

The parameter $path is not used and could be removed.

This code seems to be duplicated across your project.

            $head = 'data:image/png;base64,';
            $data = 'iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mNkYAAAAAYAAjCB0C8AAAAASUVORK5CYII=';

            $result['full']       = $head . $data;

$result was never initialized. Although not strictly required by PHP, it is generally a good practice to add $result = array(); before regardless.

            $result['base64data'] = $data;
            return $result;
        }, 10, 2 );

        $instance = new autoptimizeStyles( $css_orig );
        $instance->setOption( 'datauris', true );

        $fixurls_result = autoptimizeStyles::fixurls( ABSPATH . 'wp-content/themes/my-theme/style.css', $css_orig );
        $css_actual     = $instance->rewrite_assets( $fixurls_result );

        $this->assertEquals( $css_expected, $css_actual );
    }

    /**
     * Doing rewrite_assets() without calling fixurls() beforehand could
     * cause wrong results if/when there's a (same) image referenced via
     * root-relative and relative urls, i.e.,
     * `/wp-content/themes/my-theme/images/shadow.png` and
     * `wp-content/themes/my-theme/images/shadow.png` in test code below.
     * That's because urls are not really "normalized" in rewrite_assets() at
     * all, and replacements are done using simple string keys (based on url),
     * so whenever the shorter url ends up being spotted first, the replacement
     * was done in a way that leaves the first `/` character in place.
     * Which could mean trouble, especially when doing inlining of smaller
     * images.
     * After sorting the replacements array in rewrite_assets() by string
     * length in descending order, the problem goes away.
     */
    public function test_background_datauri_sprites_without_fixurls()
    {
        $css_orig     = <<<CSS
.shadow { background:url(img/1x1.png) top center; }
.shadow1 { background-image:url(img/1x1.png) 0 -767px repeat-x; }
.shadow2 {background:url(img/1x1.png) top center}

.test { background:url(img/1x1.png) top center; }
.test1 { background-image:url('img/1x1.png') 0 -767px repeat-x; }
.test2 {background:url("img/1x1.png") top center}

section.clipped.clippedTop {clip-path:url("#clipPolygonTop")}
section.clipped.clippedBottom {clip-path:url("#clipPolygonBottom")}
.myimg {background-image: url("images/under-left-leaf.png"), url("images/over-blue-bird.png"), url("images/under-top.png"), url("images/bg-top-grunge.png");}
.something {
    background:url(http://example.org/wp-content/themes/my-theme/images/nothing.png);
}
.something-else {background:url(wp-content/themes/my-theme/images/shadow.png) -100px 0 repeat-y;}
.another-thing { background:url(/wp-content/themes/my-theme/images/shadow.png) 0 -767px repeat-x; }
#whatevz {background:url(wp-content/themes/my-theme/images/shadow.png) center top no-repeat;}

.widget ul li { background:url(img/shadow.png) top center; }
CSS;
        $css_expected = <<<CSS
.shadow { background:url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mNkYAAAAAYAAjCB0C8AAAAASUVORK5CYII=) top center; }
.shadow1 { background-image:url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mNkYAAAAAYAAjCB0C8AAAAASUVORK5CYII=) 0 -767px repeat-x; }
.shadow2 {background:url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mNkYAAAAAYAAjCB0C8AAAAASUVORK5CYII=) top center}

.test { background:url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mNkYAAAAAYAAjCB0C8AAAAASUVORK5CYII=) top center; }
.test1 { background-image:url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mNkYAAAAAYAAjCB0C8AAAAASUVORK5CYII=) 0 -767px repeat-x; }
.test2 {background:url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mNkYAAAAAYAAjCB0C8AAAAASUVORK5CYII=) top center}

section.clipped.clippedTop {clip-path:url("#clipPolygonTop")}
section.clipped.clippedBottom {clip-path:url("#clipPolygonBottom")}
.myimg {background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mNkYAAAAAYAAjCB0C8AAAAASUVORK5CYII=), url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mNkYAAAAAYAAjCB0C8AAAAASUVORK5CYII=), url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mNkYAAAAAYAAjCB0C8AAAAASUVORK5CYII=), url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mNkYAAAAAYAAjCB0C8AAAAASUVORK5CYII=);}
.something {
    background:url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mNkYAAAAAYAAjCB0C8AAAAASUVORK5CYII=);
}
.something-else {background:url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mNkYAAAAAYAAjCB0C8AAAAASUVORK5CYII=) -100px 0 repeat-y;}
.another-thing { background:url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mNkYAAAAAYAAjCB0C8AAAAASUVORK5CYII=) 0 -767px repeat-x; }
#whatevz {background:url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mNkYAAAAAYAAjCB0C8AAAAASUVORK5CYII=) center top no-repeat;}

.widget ul li { background:url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mNkYAAAAAYAAjCB0C8AAAAASUVORK5CYII=) top center; }
CSS;

        // For test purposes, ALL images in the css are being inlined with a 1x1 trans png string/datauri.
        add_filter( 'autoptimize_filter_css_is_datauri_candidate', function( $is_candidate, $path ) {

The parameter $is_candidate is not used and could be removed.

The parameter $path is not used and could be removed.

            return true;
        }, 10, 2 );

        // For test purposes, ALL images in the css are being inlined with a 1x1 trans png string/datauri.
        add_filter( 'autoptimize_filter_css_datauri_image', function( $base64array, $path ) {

The parameter $base64array is not used and could be removed.

The parameter $path is not used and could be removed.

This code seems to be duplicated across your project.

            $head = 'data:image/png;base64,';
            $data = 'iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mNkYAAAAAYAAjCB0C8AAAAASUVORK5CYII=';

            $result['full']       = $head . $data;

$result was never initialized. Although not strictly required by PHP, it is generally a good practice to add $result = array(); before regardless.

            $result['base64data'] = $data;
            return $result;
        }, 10, 2 );

        $instance = new autoptimizeStyles( $css_orig );
        $instance->setOption( 'datauris', true );
        $css_actual = $instance->rewrite_assets( $css_orig );
        $this->assertEquals( $css_expected, $css_actual );
    }

    /**
     * Test css with fonts pointed to the CDN + cdn_url option is set.
     */
    public function test_css_fonts_on_cdn_with_filter()
    {
        $urls    = $this->get_urls();
        $siteurl = $urls['siteurl'];
        $cdnurl  = $urls['cdnurl'];
        $sub     = $urls['subfolder'];

        $css_in = <<<CSS
/* these should not be touched except for quotes removal */
@font-face {
  font-family: 'Roboto';
  font-style: normal;
  font-weight: 100;
  src: url('../fonts/roboto-v15-latin-ext_latin-100.eot'); /* IE9 Compat Modes */
  src: local('Roboto Thin'), local('Roboto-Thin'),
       url('../fonts/roboto-v15-latin-ext_latin-100.eot?#iefix') format('embedded-opentype'), /* IE6-IE8 */
       url('../fonts/roboto-v15-latin-ext_latin-100.woff2') format('woff2'), /* Super Modern Browsers */
       url('../fonts/roboto-v15-latin-ext_latin-100.woff') format('woff'), /* Modern Browsers */
       url('../fonts/roboto-v15-latin-ext_latin-100.ttf') format('truetype'), /* Safari, Android, iOS */
       url('../fonts/roboto-v15-latin-ext_latin-100.svg#Roboto') format('svg'); /* Legacy iOS */
}
@font-face {
  font-family: 'Roboto';
  font-style: normal;
  font-weight: 100;
  src: url('//fonts/roboto-v15-latin-ext_latin-100.eot'); /* IE9 Compat Modes */
  src: local('Roboto Thin'), local('Roboto-Thin'),
       url('//fonts/roboto-v15-latin-ext_latin-100.eot?#iefix') format('embedded-opentype'), /* IE6-IE8 */
       url('//fonts/roboto-v15-latin-ext_latin-100.woff2') format('woff2'), /* Super Modern Browsers */
       url('//fonts/roboto-v15-latin-ext_latin-100.woff') format('woff'), /* Modern Browsers */
       url('//fonts/roboto-v15-latin-ext_latin-100.ttf') format('truetype'), /* Safari, Android, iOS */
       url('//fonts/roboto-v15-latin-ext_latin-100.svg#Roboto') format('svg'); /* Legacy iOS */
}
/* these will be replaced and quotes gone */
@font-face {
  font-family: 'Roboto';
  font-style: normal;
  font-weight: 100;
  src: url('/fonts/roboto-v15-latin-ext_latin-100.eot'); /* IE9 Compat Modes */
  src: local('Roboto Thin'), local('Roboto-Thin'),
       url('/fonts/roboto-v15-latin-ext_latin-100.eot?#iefix') format('embedded-opentype'), /* IE6-IE8 */
       url('/fonts/roboto-v15-latin-ext_latin-100.woff2') format('woff2'), /* Super Modern Browsers */
       url('/fonts/roboto-v15-latin-ext_latin-100.woff') format('woff'), /* Modern Browsers */
       url('/fonts/roboto-v15-latin-ext_latin-100.ttf') format('truetype'), /* Safari, Android, iOS */
       url('/fonts/roboto-v15-latin-ext_latin-100.svg#Roboto') format('svg'); /* Legacy iOS */
}
@font-face {
  font-family: 'Roboto';
  font-style: normal;
  font-weight: 100;
  src: url('$siteurl/wp-content/themes/mytheme/fonts/roboto-v15-latin-ext_latin-100.eot'); /* IE9 Compat Modes */
  src: local('Roboto Thin'), local('Roboto-Thin'),
       url('$siteurl/wp-content/themes/mytheme/fonts/roboto-v15-latin-ext_latin-100.eot?#iefix') format('embedded-opentype'), /* IE6-IE8 */
       url('$siteurl/wp-content/themes/mytheme/fonts/roboto-v15-latin-ext_latin-100.woff2') format('woff2'), /* Super Modern Browsers */
       url('$siteurl/wp-content/themes/mytheme/fonts/roboto-v15-latin-ext_latin-100.woff') format('woff'), /* Modern Browsers */
       url('$siteurl/wp-content/themes/mytheme/fonts/roboto-v15-latin-ext_latin-100.ttf') format('truetype'), /* Safari, Android, iOS */
       url('$siteurl/wp-content/themes/mytheme/fonts/roboto-v15-latin-ext_latin-100.svg#Roboto') format('svg'); /* Legacy iOS */
}
CSS;

        $css_expected_fonts_cdn = <<<CSS
/* these should not be touched except for quotes removal */
@font-face {
  font-family: 'Roboto';
  font-style: normal;
  font-weight: 100;
  src: url(../fonts/roboto-v15-latin-ext_latin-100.eot); /* IE9 Compat Modes */
  src: local('Roboto Thin'), local('Roboto-Thin'),
       url(../fonts/roboto-v15-latin-ext_latin-100.eot?#iefix) format('embedded-opentype'), /* IE6-IE8 */
       url(../fonts/roboto-v15-latin-ext_latin-100.woff2) format('woff2'), /* Super Modern Browsers */
       url(../fonts/roboto-v15-latin-ext_latin-100.woff) format('woff'), /* Modern Browsers */
       url(../fonts/roboto-v15-latin-ext_latin-100.ttf) format('truetype'), /* Safari, Android, iOS */
       url(../fonts/roboto-v15-latin-ext_latin-100.svg#Roboto) format('svg'); /* Legacy iOS */
}
@font-face {
  font-family: 'Roboto';
  font-style: normal;
  font-weight: 100;
  src: url(//fonts/roboto-v15-latin-ext_latin-100.eot); /* IE9 Compat Modes */
  src: local('Roboto Thin'), local('Roboto-Thin'),
       url(//fonts/roboto-v15-latin-ext_latin-100.eot?#iefix) format('embedded-opentype'), /* IE6-IE8 */
       url(//fonts/roboto-v15-latin-ext_latin-100.woff2) format('woff2'), /* Super Modern Browsers */
       url(//fonts/roboto-v15-latin-ext_latin-100.woff) format('woff'), /* Modern Browsers */
       url(//fonts/roboto-v15-latin-ext_latin-100.ttf) format('truetype'), /* Safari, Android, iOS */
       url(//fonts/roboto-v15-latin-ext_latin-100.svg#Roboto) format('svg'); /* Legacy iOS */
}
/* these will be replaced and quotes gone */
@font-face {
  font-family: 'Roboto';
  font-style: normal;
  font-weight: 100;
  src: url(${cdnurl}/${sub}fonts/roboto-v15-latin-ext_latin-100.eot); /* IE9 Compat Modes */
  src: local('Roboto Thin'), local('Roboto-Thin'),
       url(${cdnurl}/${sub}fonts/roboto-v15-latin-ext_latin-100.eot?#iefix) format('embedded-opentype'), /* IE6-IE8 */
       url(${cdnurl}/${sub}fonts/roboto-v15-latin-ext_latin-100.woff2) format('woff2'), /* Super Modern Browsers */
       url(${cdnurl}/${sub}fonts/roboto-v15-latin-ext_latin-100.woff) format('woff'), /* Modern Browsers */
       url(${cdnurl}/${sub}fonts/roboto-v15-latin-ext_latin-100.ttf) format('truetype'), /* Safari, Android, iOS */
       url(${cdnurl}/${sub}fonts/roboto-v15-latin-ext_latin-100.svg#Roboto) format('svg'); /* Legacy iOS */
}
@font-face {
  font-family: 'Roboto';
  font-style: normal;
  font-weight: 100;
  src: url(${cdnurl}/${sub}wp-content/themes/mytheme/fonts/roboto-v15-latin-ext_latin-100.eot); /* IE9 Compat Modes */
  src: local('Roboto Thin'), local('Roboto-Thin'),
       url(${cdnurl}/${sub}wp-content/themes/mytheme/fonts/roboto-v15-latin-ext_latin-100.eot?#iefix) format('embedded-opentype'), /* IE6-IE8 */
       url(${cdnurl}/${sub}wp-content/themes/mytheme/fonts/roboto-v15-latin-ext_latin-100.woff2) format('woff2'), /* Super Modern Browsers */
       url(${cdnurl}/${sub}wp-content/themes/mytheme/fonts/roboto-v15-latin-ext_latin-100.woff) format('woff'), /* Modern Browsers */
       url(${cdnurl}/${sub}wp-content/themes/mytheme/fonts/roboto-v15-latin-ext_latin-100.ttf) format('truetype'), /* Safari, Android, iOS */
       url(${cdnurl}/${sub}wp-content/themes/mytheme/fonts/roboto-v15-latin-ext_latin-100.svg#Roboto) format('svg'); /* Legacy iOS */
}
CSS;

        // Test with fonts pointed to the CDN + cdn option is set.
        add_filter( 'autoptimize_filter_css_fonts_cdn', '__return_true' );
        $instance = new autoptimizeStyles( $css_in );
        $instance->setOption( 'cdn_url', $cdnurl );
        $css_actual_fonts_cdn = $instance->rewrite_assets( $css_in );

        $this->assertEquals( $css_expected_fonts_cdn, $css_actual_fonts_cdn );
    }

    /**
     * Test css fonts not moved to cdn by default even if cdn_url option is set.
     */
    public function test_css_fonts_skipped_by_default_even_when_cdn_is_set()
    {
        $urls      = $this->get_urls();
        $siteurl   = $urls['siteurl'];
        $subfolder = $urls['subfolder'];

$subfolder is not used, you could remove the assignment.

        $css_in = <<<CSS
/* these should not be changed, not even quotes */
@font-face {
  font-family: 'Roboto';
  font-style: normal;
  font-weight: 100;
  src: url('../fonts/roboto-v15-latin-ext_latin-100.eot'); /* IE9 Compat Modes */
  src: local('Roboto Thin'), local('Roboto-Thin'),
       url('../fonts/roboto-v15-latin-ext_latin-100.eot?#iefix') format('embedded-opentype'), /* IE6-IE8 */
       url('../fonts/roboto-v15-latin-ext_latin-100.woff2') format('woff2'), /* Super Modern Browsers */
       url('../fonts/roboto-v15-latin-ext_latin-100.woff') format('woff'), /* Modern Browsers */
       url('../fonts/roboto-v15-latin-ext_latin-100.ttf') format('truetype'), /* Safari, Android, iOS */
       url('../fonts/roboto-v15-latin-ext_latin-100.svg#Roboto') format('svg'); /* Legacy iOS */
}
@font-face {
  font-family: 'Roboto';
  font-style: normal;
  font-weight: 100;
  src: url('//fonts/roboto-v15-latin-ext_latin-100.eot'); /* IE9 Compat Modes */
  src: local('Roboto Thin'), local('Roboto-Thin'),
       url('//fonts/roboto-v15-latin-ext_latin-100.eot?#iefix') format('embedded-opentype'), /* IE6-IE8 */
       url('//fonts/roboto-v15-latin-ext_latin-100.woff2') format('woff2'), /* Super Modern Browsers */
       url('//fonts/roboto-v15-latin-ext_latin-100.woff') format('woff'), /* Modern Browsers */
       url('//fonts/roboto-v15-latin-ext_latin-100.ttf') format('truetype'), /* Safari, Android, iOS */
       url('//fonts/roboto-v15-latin-ext_latin-100.svg#Roboto') format('svg'); /* Legacy iOS */
}
@font-face {
  font-family: 'Roboto';
  font-style: normal;
  font-weight: 100;
  src: url('/fonts/roboto-v15-latin-ext_latin-100.eot'); /* IE9 Compat Modes */
  src: local('Roboto Thin'), local('Roboto-Thin'),
       url('/fonts/roboto-v15-latin-ext_latin-100.eot?#iefix') format('embedded-opentype'), /* IE6-IE8 */
       url('/fonts/roboto-v15-latin-ext_latin-100.woff2') format('woff2'), /* Super Modern Browsers */
       url('/fonts/roboto-v15-latin-ext_latin-100.woff') format('woff'), /* Modern Browsers */
       url('/fonts/roboto-v15-latin-ext_latin-100.ttf') format('truetype'), /* Safari, Android, iOS */
       url('/fonts/roboto-v15-latin-ext_latin-100.svg#Roboto') format('svg'); /* Legacy iOS */
}
@font-face {
  font-family: 'Roboto';
  font-style: normal;
  font-weight: 100;
  src: url('$siteurl/wp-content/themes/mytheme/fonts/roboto-v15-latin-ext_latin-100.eot'); /* IE9 Compat Modes */
  src: local('Roboto Thin'), local('Roboto-Thin'),
       url('$siteurl/wp-content/themes/mytheme/fonts/roboto-v15-latin-ext_latin-100.eot?#iefix') format('embedded-opentype'), /* IE6-IE8 */
       url('$siteurl/wp-content/themes/mytheme/fonts/roboto-v15-latin-ext_latin-100.woff2') format('woff2'), /* Super Modern Browsers */
       url('$siteurl/wp-content/themes/mytheme/fonts/roboto-v15-latin-ext_latin-100.woff') format('woff'), /* Modern Browsers */
       url('$siteurl/wp-content/themes/mytheme/fonts/roboto-v15-latin-ext_latin-100.ttf') format('truetype'), /* Safari, Android, iOS */
       url('$siteurl/wp-content/themes/mytheme/fonts/roboto-v15-latin-ext_latin-100.svg#Roboto') format('svg'); /* Legacy iOS */
}
CSS;
        // Expected without cdning fonts but cdn option is set.
        $css_expected = <<<CSS
/* these should not be changed, not even quotes */
@font-face {
  font-family: 'Roboto';
  font-style: normal;
  font-weight: 100;
  src: url('../fonts/roboto-v15-latin-ext_latin-100.eot'); /* IE9 Compat Modes */
  src: local('Roboto Thin'), local('Roboto-Thin'),
       url('../fonts/roboto-v15-latin-ext_latin-100.eot?#iefix') format('embedded-opentype'), /* IE6-IE8 */
       url('../fonts/roboto-v15-latin-ext_latin-100.woff2') format('woff2'), /* Super Modern Browsers */
       url('../fonts/roboto-v15-latin-ext_latin-100.woff') format('woff'), /* Modern Browsers */
       url('../fonts/roboto-v15-latin-ext_latin-100.ttf') format('truetype'), /* Safari, Android, iOS */
       url('../fonts/roboto-v15-latin-ext_latin-100.svg#Roboto') format('svg'); /* Legacy iOS */
}
@font-face {
  font-family: 'Roboto';
  font-style: normal;
  font-weight: 100;
  src: url('//fonts/roboto-v15-latin-ext_latin-100.eot'); /* IE9 Compat Modes */
  src: local('Roboto Thin'), local('Roboto-Thin'),
       url('//fonts/roboto-v15-latin-ext_latin-100.eot?#iefix') format('embedded-opentype'), /* IE6-IE8 */
       url('//fonts/roboto-v15-latin-ext_latin-100.woff2') format('woff2'), /* Super Modern Browsers */
       url('//fonts/roboto-v15-latin-ext_latin-100.woff') format('woff'), /* Modern Browsers */
       url('//fonts/roboto-v15-latin-ext_latin-100.ttf') format('truetype'), /* Safari, Android, iOS */
       url('//fonts/roboto-v15-latin-ext_latin-100.svg#Roboto') format('svg'); /* Legacy iOS */
}
@font-face {
  font-family: 'Roboto';
  font-style: normal;
  font-weight: 100;
  src: url('/fonts/roboto-v15-latin-ext_latin-100.eot'); /* IE9 Compat Modes */
  src: local('Roboto Thin'), local('Roboto-Thin'),
       url('/fonts/roboto-v15-latin-ext_latin-100.eot?#iefix') format('embedded-opentype'), /* IE6-IE8 */
       url('/fonts/roboto-v15-latin-ext_latin-100.woff2') format('woff2'), /* Super Modern Browsers */
       url('/fonts/roboto-v15-latin-ext_latin-100.woff') format('woff'), /* Modern Browsers */
       url('/fonts/roboto-v15-latin-ext_latin-100.ttf') format('truetype'), /* Safari, Android, iOS */
       url('/fonts/roboto-v15-latin-ext_latin-100.svg#Roboto') format('svg'); /* Legacy iOS */
}
@font-face {
  font-family: 'Roboto';
  font-style: normal;
  font-weight: 100;
  src: url('$siteurl/wp-content/themes/mytheme/fonts/roboto-v15-latin-ext_latin-100.eot'); /* IE9 Compat Modes */
  src: local('Roboto Thin'), local('Roboto-Thin'),
       url('$siteurl/wp-content/themes/mytheme/fonts/roboto-v15-latin-ext_latin-100.eot?#iefix') format('embedded-opentype'), /* IE6-IE8 */
       url('$siteurl/wp-content/themes/mytheme/fonts/roboto-v15-latin-ext_latin-100.woff2') format('woff2'), /* Super Modern Browsers */
       url('$siteurl/wp-content/themes/mytheme/fonts/roboto-v15-latin-ext_latin-100.woff') format('woff'), /* Modern Browsers */
       url('$siteurl/wp-content/themes/mytheme/fonts/roboto-v15-latin-ext_latin-100.ttf') format('truetype'), /* Safari, Android, iOS */
       url('$siteurl/wp-content/themes/mytheme/fonts/roboto-v15-latin-ext_latin-100.svg#Roboto') format('svg'); /* Legacy iOS */
}
CSS;
        // Test without moving fonts to CDN, but cdn option is set.
        $instance = new autoptimizeStyles( $css_in );
        $instance->setOption( 'cdn_url', $urls['cdnurl'] );
        $css_actual = $instance->rewrite_assets( $css_in );
        $this->assertEquals( $css_expected, $css_actual );
    }

    public function test_assets_regex_replaces_multi_bg_images()
    {
        $urls   = $this->get_urls();
        $sub    = $urls['subfolder'];
        $cdnurl = $urls['cdnurl'];

        $in = <<<CSS
body:after {
  content: url(/img/close.png) url(/img/loading.gif) url(/img/prev.png) url(/img/next.png);
}
CSS;

        $expected = <<<CSS
body:after {
  content: url($cdnurl/${sub}img/close.png) url($cdnurl/${sub}img/loading.gif) url($cdnurl/${sub}img/prev.png) url($cdnurl/${sub}img/next.png);
}
CSS;

        $instance = new autoptimizeStyles( $in );
        $instance->setOption( 'cdn_url', $cdnurl );
        $actual = $instance->rewrite_assets( $in );

        $this->assertEquals( $expected, $actual );
    }

    public function test_at_supports_spacing_issue_110()
    {
        $in       = <<<CSS
@supports (-webkit-filter: blur(3px)) or (filter: blur(3px)) {
    .blur {
        filter:blur(3px);
    }
}
@supports((position:-webkit-sticky) or (position:sticky)) {
    .sticky { position:sticky; }
}
CSS;
        $expected = <<<CSS
@supports (-webkit-filter:blur(3px)) or (filter:blur(3px)){.blur{filter:blur(3px)}}@supports((position:-webkit-sticky) or (position:sticky)){.sticky{position:sticky}}
CSS;

        $instance = new autoptimizeStyles( $in );
        $actual   = $instance->run_minifier_on( $in );

        $this->assertEquals( $expected, $actual );
    }

    public function test_css_import_semicolon_url_issue_122()

This method seems to be duplicated in your project.

    {
        $urls   = $this->get_urls();
        $sub    = $urls['subfolder'];
        $cdnurl = $urls['cdnurl'];

        $in = <<<HTML
<style type="text/css">
@import url("foo.css?a&#038;b");
@import url("bar.css");
</style>
HTML;

        $expected = '<style media="all">@import url(' . $cdnurl . '/' . $sub . 'foo.css?a&#038;b);@import url(' . $cdnurl . '/' . $sub . 'bar.css);</style><!--noptimize--><!-- Autoptimize found a problem with the HTML in your Theme, tag `title` missing --><!--/noptimize-->';

        $options = [
            'autoptimizeStyles' => $this->getAoStylesDefaultOptions(),
        ];

        $instance = new autoptimizeStyles( $in );
        $instance->read( $options['autoptimizeStyles'] );
        $instance->minify();
        $instance->cache();
        $actual = $instance->getcontent();
        $this->assertEquals( $expected, $actual );
    }

    public function test_fixurls_with_at_imports_and_media_queries()
    {
        $urls      = $this->get_urls();
        $prsiteurl = $urls['prsiteurl'];
        $subfolder = $urls['subfolder'];

$subfolder is not used, you could remove the assignment.

        $in  = '@import "foo.css"; @import "bar.css" (orientation:landscape);';
        $exp = '@import url(' . $prsiteurl . '/wp-content/themes/my-theme/foo.css); @import url(' . $prsiteurl . '/wp-content/themes/my-theme/bar.css) (orientation:landscape);';

        $actual = autoptimizeStyles::fixurls( ABSPATH . 'wp-content/themes/my-theme/style.css', $in );
        $this->assertEquals( $exp, $actual );
    }

    public function test_aostyles_at_imports_with_media_queries()

This method seems to be duplicated in your project.

    {
        $urls   = $this->get_urls();
        $sub    = $urls['subfolder'];
        $cdnurl = $urls['cdnurl'];

        $in = <<<HTML
<style type="text/css">
@import "foo.css"; @import "bar.css" (orientation:landscape);
</style>
HTML;

        $expected = '<style media="all">@import url(' . $cdnurl . '/' . $sub . 'foo.css);@import url(' . $cdnurl . '/' . $sub . 'bar.css) (orientation:landscape);</style><!--noptimize--><!-- Autoptimize found a problem with the HTML in your Theme, tag `title` missing --><!--/noptimize-->';

        $options = [
            'autoptimizeStyles' => $this->getAoStylesDefaultOptions(),
        ];

        $instance = new autoptimizeStyles( $in );
        $instance->read( $options['autoptimizeStyles'] );
        $instance->minify();
        $instance->cache();

        $actual = $instance->getcontent();
        $this->assertEquals( $expected, $actual );
    }

    public function test_cache_size_checker_hooked_by_default()
    {
        $this->assertNotEmpty( autoptimizeCacheChecker::SCHEDULE_HOOK );

        // No schedule, because it's only added when is_admin() is true.
        $this->assertEquals( false, wp_get_schedule( autoptimizeCacheChecker::SCHEDULE_HOOK ) );

        // Proving that setup() sets the schedule as needed.
        $checker = new autoptimizeCacheChecker();
        $checker->setup();
        $this->assertEquals( 'twicedaily', wp_get_schedule( autoptimizeCacheChecker::SCHEDULE_HOOK ) );
    }

    public function test_cache_size_checker_disabled_with_filter()
    {
        add_filter( 'autoptimize_filter_cachecheck_do', '__return_false' );

        $checker = new autoptimizeCacheChecker();
        $checker->setup();
        $this->assertEquals( false, wp_get_schedule( autoptimizeCacheChecker::SCHEDULE_HOOK ) );

        remove_all_filters( 'autoptimize_filter_cachecheck_do' );
    }

    public function test_is_start_buffering_hooked_properly()
    {
        $instance = autoptimize();

        /**
         * TODO/FIXME: ideally, we'd test all possible setups, but once we set
         * a constant, there's no going back, unless we use runkit or somesuch:
         * https://www.theaveragedev.com/mocking-constants-in-tests/.
         */

        if ( defined( 'AUTOPTIMIZE_INIT_EARLIER' ) ) {
            $this->assertEquals(
                autoptimizeMain::INIT_EARLIER_PRIORITY,
                has_action( 'init', array( $instance, 'start_buffering' ) )
            );
            $this->assertTrue( ! defined( 'AUTOPTIMIZE_HOOK_INTO' ) );
        }

        /*
        // AUTOPTIMIZE_HOOK_INTO only exists if AUTOPTIMIZE_INIT_EARLIER doesnt
        $this->assertEquals(
            autoptimizeMain::DEFAULT_HOOK_PRIORITY,
            has_action( constant( 'AUTOPTIMIZE_HOOK_INTO' ), array( $instance, 'start_buffering' ) )
        );
        $this->assertFalse(
            has_action( 'init', array( $instance, 'start_buffering' ) )
        );
        */
    }

    public function test_inline_and_defer_markup()
    {
        add_filter( 'autoptimize_filter_css_defer', '__return_true' );
        add_filter( 'autoptimize_filter_css_defer_inline', '__return_true' );

        $actual = $this->ao->end_buffering( $this->get_test_markup() );
        if ( is_multisite() ) {
            $this->assertEquals( $this->get_test_markup_output_inline_defer_ms(), $actual );
        } else {
            $this->assertEquals( $this->get_test_markup_output_inline_defer(), $actual );
        }

        remove_all_filters( 'autoptimize_filter_css_defer' );
        remove_all_filters( 'autoptimize_filter_css_defer_inline' );
    }

    public function test_js_aggregation_decision_and_dontaggregate_filter()

This method seems to be duplicated in your project.

    {
        $opts = $this->getAoScriptsDefaultOptions();

        // Aggregating: true by default.
        $scripts = new autoptimizeScripts( '' );
        $scripts->read( $opts );
        $this->assertTrue( $scripts->aggregating() );

        // Aggregating: option=true (dontaggregate=false by default).
        $opts['aggregate'] = true;
        $scripts           = new autoptimizeScripts( '' );
        $scripts->read( $opts );
        $this->assertTrue( $scripts->aggregating() );

        // Aggregating: option=true, dontaggregate=false explicit.
        $opts['aggregate'] = true;
        add_filter( 'autoptimize_filter_js_dontaggregate', '__return_false' );
        $scripts = new autoptimizeScripts( '' );
        $scripts->read( $opts );
        $this->assertTrue( $scripts->aggregating() );
        remove_all_filters( 'autoptimize_filter_js_dontaggregate' );

        // Not aggregating: option=true, dontaggregate=true.
        $opts['aggregate'] = true;
        add_filter( 'autoptimize_filter_js_dontaggregate', '__return_true' );
        $scripts = new autoptimizeScripts( '' );
        $scripts->read( $opts );
        $this->assertFalse( $scripts->aggregating() );
        remove_all_filters( 'autoptimize_filter_js_dontaggregate' );

        // Not aggregating: option=false, dontaggregate=false.
        $opts['aggregate'] = false;
        add_filter( 'autoptimize_filter_js_dontaggregate', '__return_false' );
        $scripts = new autoptimizeScripts( '' );
        $scripts->read( $opts );
        $this->assertFalse( $scripts->aggregating() );
        remove_all_filters( 'autoptimize_filter_js_dontaggregate' );

        // Not aggregating: option=false, dontaggregate=true.
        $opts['aggregate'] = false;
        add_filter( 'autoptimize_filter_js_dontaggregate', '__return_true' );
        $scripts = new autoptimizeScripts( '' );
        $scripts->read( $opts );
        $this->assertFalse( $scripts->aggregating() );
        remove_all_filters( 'autoptimize_filter_js_dontaggregate' );
    }

    public function test_css_aggregation_decision_and_dontaggregate_filter()

This method seems to be duplicated in your project.

    {
        $opts = $this->getAoStylesDefaultOptions();

        // Aggregating: true by default.
        $styles = new autoptimizeStyles( '' );
        $this->assertTrue( $styles->aggregating() );

        // Aggregating: option=true (dontaggregate=false by default).
        $opts['aggregate'] = true;
        $styles            = new autoptimizeStyles( '' );
        $styles->read( $opts );
        $this->assertTrue( $styles->aggregating() );

        // Aggregating: option=true, dontaggregate=false explicit.
        $opts['aggregate'] = true;
        add_filter( 'autoptimize_filter_css_dontaggregate', '__return_false' );
        $styles = new autoptimizeStyles( '' );
        $styles->read( $opts );
        $this->assertTrue( $styles->aggregating() );
        remove_all_filters( 'autoptimize_filter_css_dontaggregate' );

        // Not aggregating: option=true, dontaggregate=true.
        $opts['aggregate'] = true;
        add_filter( 'autoptimize_filter_css_dontaggregate', '__return_true' );
        $styles = new autoptimizeStyles( '' );
        $styles->read( $opts );
        $this->assertFalse( $styles->aggregating() );
        remove_all_filters( 'autoptimize_filter_css_dontaggregate' );

        // Not aggregating: option=false, dontaggregate=false.
        $opts['aggregate'] = false;
        add_filter( 'autoptimize_filter_css_dontaggregate', '__return_false' );
        $styles = new autoptimizeStyles( '' );
        $styles->read( $opts );
        $this->assertFalse( $styles->aggregating() );
        remove_all_filters( 'autoptimize_filter_css_dontaggregate' );

        // Not aggregating: option=false, dontaggregate=true.
        $opts['aggregate'] = false;
        add_filter( 'autoptimize_filter_css_dontaggregate', '__return_true' );
        $styles = new autoptimizeStyles( '' );
        $styles->read( $opts );
        $this->assertFalse( $styles->aggregating() );
        remove_all_filters( 'autoptimize_filter_css_dontaggregate' );
    }

    public function test_css_minify_single_with_cdning()
    {
        $pathname = dirname( __FILE__ ) . '/fixtures/minify-single.css';
        $opts     = $this->getAoStylesDefaultOptions();
        $styles   = new autoptimizeStyles( '' );
        $styles->read( $opts );

        $url = $styles->minify_single( $pathname, $cache_miss = true );

        // Minified url filename + its pointed to cdn.
        $this->assertContains( AUTOPTIMIZE_CACHE_CHILD_DIR, $url );
        $this->assertContains( '/autoptimize_single_', $url );
        $this->assertContains( $styles->cdn_url, $url );

        // Actual minified css contents are minified and cdn-ed.
        $path     = $styles->getpath( $url );

It seems like $url defined by $styles->minify_single($pathname, $cache_miss = true) on line 1944 can also be of type false; however, autoptimizeBase::getpath() does only seem to accept string, did you maybe forget to handle an error condition?

        $contents = file_get_contents( $path );
        $this->assertContains( $styles->cdn_url, $contents );
        $this->assertContains( '.bg{background:url(' . $styles->cdn_url, $contents );
    }

    public function test_ao_partners_instantiation_without_explicit_include()
    {
        $partners = new autoptimizePartners();
        $this->assertTrue( $partners instanceof autoptimizePartners );
    }

    public function test_html_minify_keep_html_comments_inside_script_blocks()

This method seems to be duplicated in your project.

    {
        $markup   = <<<MARKUP
<script>
<!-- End Support AJAX add to cart -->
var a = "b";
</script>
MARKUP;
        $expected = <<<MARKUP
<script><!-- End Support AJAX add to cart -->
var a = "b";</script>
MARKUP;

        $markup2 = <<<MARKUP
<script>
var a = "b";
<!-- End Support AJAX add to cart -->
</script>
MARKUP;

        $expected2 = <<<MARKUP
<script>var a = "b";
<!-- End Support AJAX add to cart --></script>
MARKUP;

        // When keepcomments is true.
        $options = [
            'autoptimizeHTML' => [
                'keepcomments' => true,
            ],
        ];

        $instance = new autoptimizeHTML( $markup );
        $instance->read( $options['autoptimizeHTML'] );
        $instance->minify();
        $actual = $instance->getcontent();
        $this->assertEquals( $expected, $actual );

        $instance = new autoptimizeHTML( $markup2 );
        $instance->read( $options['autoptimizeHTML'] );
        $instance->minify();
        $actual2 = $instance->getcontent();
        $this->assertEquals( $expected2, $actual2 );
    }

    public function test_html_minify_remove_html_comments_inside_script_blocks()

This method seems to be duplicated in your project.

    {
        // Default case, html comments removed (keepcomments = false).
        $markup1   = <<<MARKUP
<script>
var a = "b";
<!-- End Support AJAX add to cart -->
</script>
MARKUP;
        $expected1 = <<<MARKUP
<script>var a = "b";
<!-- End Support AJAX add to cart</script>
MARKUP;

        $markup2   = <<<MARKUP
<script>
<!-- End Support AJAX add to cart -->
var a = "b";
</script>
MARKUP;
        $expected2 = <<<MARKUP
<script>End Support AJAX add to cart -->
var a = "b";</script>
MARKUP;

        $options = [
            'autoptimizeHTML' => [
                'keepcomments' => false,
            ],
        ];

        $instance = new autoptimizeHTML( $markup1 );
        $instance->read( $options['autoptimizeHTML'] );
        $instance->minify();
        $actual = $instance->getcontent();
        $this->assertEquals( $expected1, $actual );

        $instance = new autoptimizeHTML( $markup2 );
        $instance->read( $options['autoptimizeHTML'] );
        $instance->minify();
        $actual2 = $instance->getcontent();
        $this->assertEquals( $expected2, $actual2 );
    }

    public function test_html_minify_html_comments_inside_script_blocks_old_school_pattern()

This method seems to be duplicated in your project.

    {
        $markup = <<<MARKUP
<script>
<!-- // invisible for old browsers
var a = "z";
// -->
</script>
MARKUP;

        $expected = <<<MARKUP
<script>// invisible for old browsers
var a = "z";</script>
MARKUP;

        $options = [
            'autoptimizeHTML' => [
                'keepcomments' => false,
            ],
        ];

        $instance = new autoptimizeHTML( $markup );
        $instance->read( $options['autoptimizeHTML'] );
        $instance->minify();
        $actual = $instance->getcontent();
        $this->assertEquals( $expected, $actual );
    }

    public function test_html_minify_html_comments_inside_script_blocks_old_school_pattern_untouched()

This method seems to be duplicated in your project.

    {
        $markup = <<<MARKUP
<script>
<!-- // invisible for old browsers
var a = "z";
// -->
</script>
MARKUP;

        $expected = <<<MARKUP
<script><!-- // invisible for old browsers
var a = "z";
// --></script>
MARKUP;

        $options = [
            'autoptimizeHTML' => [
                'keepcomments' => true,
            ],
        ];

        $instance = new autoptimizeHTML( $markup );
        $instance->read( $options['autoptimizeHTML'] );
        $instance->minify();
        $actual = $instance->getcontent();
        $this->assertEquals( $expected, $actual );
    }

    public function test_utils_mbstring_availabilty_overriding()
    {
        $orig     = autoptimizeUtils::mbstring_available();
        $opposite = ! $orig;

        $this->assertSame( $orig, autoptimizeUtils::mbstring_available() );
        // Override works...
        $this->assertSame( $opposite, autoptimizeUtils::mbstring_available( $opposite ) );
        // And override remains cached as the last version.
        $this->assertSame( $opposite, autoptimizeUtils::mbstring_available() );
    }

    public function test_utils_mbstring_basics()
    {
        // Turn on mbstring usage.
        autoptimizeUtils::mbstring_available( true );

        $this->assertSame( 2, autoptimizeUtils::strlen( "\x00\xFF", 'ASCII' ) );
        $this->assertSame( 2, autoptimizeUtils::strlen( "\x00\xFF", 'CP850' ) );
        $this->assertSame( 3, autoptimizeUtils::strlen( '한국어' ) );

        $this->assertFalse( @autoptimizeUtils::strpos( 'abc', '' ) );
        $this->assertFalse( @autoptimizeUtils::strpos( 'abc', 'a', -1 ) );
        $this->assertFalse( autoptimizeUtils::strpos( 'abc', 'd' ) );
        $this->assertFalse( autoptimizeUtils::strpos( 'abc', 'a', 3 ) );
        $this->assertSame( 1, autoptimizeUtils::strpos( '한국어', '국' ) );
    }

    /**
     * @dataProvider provider_utils_substr_replace
     */
    function test_utils_substr_replace_basics_mbstring( $s, $repl, $start, $len, $expected )
    {
        // Force mbstring code path...
        autoptimizeUtils::mbstring_available( true );
        $this->assertEquals( $expected, autoptimizeUtils::substr_replace( $s, $repl, $start, $len ) );
    }

    public function provider_utils_substr_replace()
    {
        $str  = 'try this';
        $repl = 'bala ';

        return [
            [
                $str,
                $repl,
                2,
                null,
                'trbala ',
            ],
            [
                $str,
                $repl,
                2,
                3,
                'trbala his',
            ],
            [
                $str,
                $repl,
                2,
                0,
                'trbala y this',
            ],
            [
                $str,
                $repl,
                2,
                -2,
                'trbala is',
            ],
        ];
    }

    function test_mb_substr_replace_with_ascii_input_string()

This method seems to be duplicated in your project.

    {
        autoptimizeUtils::mbstring_available( false );

        $str = 'Ascii';

        $this->assertSame( 'Añ', autoptimizeUtils::substr_replace( $str, 'ñ', 1 ) );
        $this->assertSame( 'ñcii', autoptimizeUtils::substr_replace( $str, 'ñ', 0, 2 ) );
        $this->assertSame( 'Asñx', autoptimizeUtils::substr_replace( $str, 'ñx', 2, 3 ) );
        $this->assertSame( 'Asz', autoptimizeUtils::substr_replace( $str, 'z', 2, 10 ) );
        $this->assertSame( 'Añii', autoptimizeUtils::substr_replace( $str, 'ñ', 1, 2 ) );
    }

    function test_mb_substr_replace_with_utf8_input_string()

This method seems to be duplicated in your project.

    {
        autoptimizeUtils::mbstring_available( true );

        $str = 'âønæë';

        $this->assertSame( 'âñ', autoptimizeUtils::substr_replace( $str, 'ñ', 1 ) ); // No length.
        $this->assertSame( 'ñnæë', autoptimizeUtils::substr_replace( $str, 'ñ', 0, 2 ) );
        $this->assertSame( 'âøñx', autoptimizeUtils::substr_replace( $str, 'ñx', 2, 3 ) );
        $this->assertSame( 'âøz', autoptimizeUtils::substr_replace( $str, 'z', 2, 10 ) ); // Length larger than possible...
        $this->assertSame( 'âñæë', autoptimizeUtils::substr_replace( $str, 'ñ', 1, 2 ) );
    }

    function test_default_substr_replace_with_ascii_input_string()

This method seems to be duplicated in your project.

    {
        // Disable mbstring which should fall ack to substr_replace...
        autoptimizeUtils::mbstring_available( false );

        $str = 'Ascii';

        $this->assertSame( 'Añ', autoptimizeUtils::substr_replace( $str, 'ñ', 1 ) );
        $this->assertSame( 'ñcii', autoptimizeUtils::substr_replace( $str, 'ñ', 0, 2 ) );
        $this->assertSame( 'Asñx', autoptimizeUtils::substr_replace( $str, 'ñx', 2, 3 ) );
        $this->assertSame( 'Asz', autoptimizeUtils::substr_replace( $str, 'z', 2, 10 ) );
        $this->assertSame( 'Añii', autoptimizeUtils::substr_replace( $str, 'ñ', 1, 2 ) );
    }

    function test_default_substr_replace_with_utf8_input_string()
    {
        // Disabling mbstring, falling back to substr_replace...
        autoptimizeUtils::mbstring_available( false );

        // This is really impossible to make work properly, since
        // any start/len parameters we give are working with bytes instead
        // of characters, shit just breaks.
        $str = 'âønæë';

        // $this->assertSame( '�ñ', autoptimizeUtils::substr_replace( $str, 'ñ', 1 ) ); // No length.
        // $this->assertSame( 'ñ�næë', autoptimizeUtils::substr_replace( $str, 'ñ', 1, 2 ) );
        $this->assertSame( 'ñønæë', autoptimizeUtils::substr_replace( $str, 'ñ', 0, 2 ) );
        $this->assertSame( 'âñxæë', autoptimizeUtils::substr_replace( $str, 'ñx', 2, 3 ) );
        $this->assertSame( 'âz', autoptimizeUtils::substr_replace( $str, 'z', 2, 10 ) ); // Length larger than possible...
    }

    public function test_cache_fast_delete()
    {
        add_filter( 'autoptimize_filter_cache_clear_advanced', '__return_true' );

        $this->assertTrue( autoptimizeCache::clearall_actionless() );

        remove_all_filters( 'autoptimize_filter_cache_clear_advanced' );
    }

    public function test_delete_advanced_cache_clear_artifacts()
    {
        add_filter( 'autoptimize_filter_cache_clear_advanced', '__return_true' );

        $this->assertTrue( autoptimizeCache::delete_advanced_cache_clear_artifacts() );

        remove_all_filters( 'autoptimize_filter_cache_clear_advanced' );
    }

    public function provider_canonicalization()
    {
        return array(
            array( '../common', 'common' ),
            array( '../what-does-this-mean/really?/', 'what-does-this-mean/really?/' ),
            array( '../../what/where/how', 'what/where/how' ),
            array( '/../more.dots.please/', '/more.dots.please/' ),
            array( '/../../what/where/how', '/what/where/how' ),
            array( '/a/b/c/../../../d/e/file.txt', '/d/e/file.txt' ),
            array( 'a/b/../c', 'a/c' ),
            array( './../../etc/passwd', './etc/passwd' ),
            array( '/var/.////./user/./././..//.//../////../././.././test/////', '/test/' ),
            array( '/var/user/./././.././../.././././test/', '/test/' ),
            array( '/hello/0//how/../are/../you', '/hello/0/you' ),
            array( '', '' ),
            array( '.', '.' ),
            array( '..', '..' ),
            array( './..', './..' ),
            array( '../.', '.' ),
            // This might be debatable...
            array( '../..', '..' ),
        );
    }

    /**
     * @dataProvider provider_canonicalization
     */
    public function test_path_canonicalize( $path, $canonicalized )
    {
        $this->assertSame( $canonicalized, autoptimizeUtils::path_canonicalize( $path ) );
    }

    /**
     * For a site in subfolder, CDN-rewrite used to magically include
     * the subfolder when rewriting assets to CDN.
     * That behavior can be turned off by returning false via
     * `autoptimize_filter_cdn_magic_path_check`.
     * If it's false, cdn-rewriting should not include subfolder even
     * when the site is actually in a subfolder/subdirectory.
     */
    public function test_autoptimize_filter_cdn_magic_path_check()
    {
        $cdnurl = 'http://cdn.example.org';
        add_filter( 'autoptimize_filter_cdn_magic_path_check', '__return_false', 10, 2 );

        // Even when site is in a subfolder, the resulting cdn-rewritten url
        // should not magically include it, due to the above filter.
        // The second parameter is here to force a cache miss and re-run
        // the filter since we're using the same cdn url all over the place,
        // but want to prove different things with it.
        $this->assertSame( $cdnurl, autoptimizeUtils::tweak_cdn_url_if_needed( $cdnurl, true ) );

        remove_all_filters( 'autoptimize_filter_cdn_magic_path_check' );
    }

    /**
     * Test image optimization in autoptimizeImages.php.
     *
     * Default case: img with srcsets
     */
    public function test_imgopt()
    {
        $urls                                        = $this->get_urls();
        $siteurl                                     = $urls['siteurl'];
        $imgopthost                                  = $urls['imgopthost'];
        $opts                                        = autoptimizeImages::fetch_options();
        $opts['autoptimize_imgopt_checkbox_field_1'] = '1';
        $opts['autoptimize_imgopt_checkbox_field_3'] = '0';

        $markup = <<<MARKUP
<img src='$siteurl/wp-content/image.jpg' width='400' height='200' srcset="$siteurl/wp-content/image-300X150.jpg 300w, $siteurl/wp-content/image-600X300.jpg 600w" sizes="(max-width: 300px) 100vw, 300px" />
MARKUP;

        $expected = <<<MARKUP
<img src='$imgopthost/client/q_glossy,ret_img,w_400,h_200/$siteurl/wp-content/image.jpg' width='400' height='200' srcset="$imgopthost/client/q_glossy,ret_img,w_300/$siteurl/wp-content/image-300X150.jpg 300w, $imgopthost/client/q_glossy,ret_img,w_600/$siteurl/wp-content/image-600X300.jpg 600w" sizes="(max-width: 300px) 100vw, 300px" />
MARKUP;
        $instance = autoptimizeImages::instance();
        $instance->set_options( $opts );
        $actual = $instance->filter_optimize_images( $markup );
        $this->assertEquals( $expected, $actual );
    }
    
    /**
     * Test image optimization in autoptimizeImages.php with one excluded image.
     *
     * Default case: img with srcsets
     */
    public function test_imgopt_exclusion()
    {
        $urls                                        = $this->get_urls();
        $siteurl                                     = $urls['siteurl'];
        $imgopthost                                  = $urls['imgopthost'];
        $opts                                        = autoptimizeImages::fetch_options();
        $opts['autoptimize_imgopt_checkbox_field_1'] = '1';
        $opts['autoptimize_imgopt_checkbox_field_3'] = '0';
        $opts['autoptimize_imgopt_text_field_6']     = 'excluded.jpg';

        $markup = <<<MARKUP
<img src='$siteurl/wp-content/image.jpg' width='400' height='200' srcset="$siteurl/wp-content/image-300X150.jpg 300w, $siteurl/wp-content/image-600X300.jpg 600w" sizes="(max-width: 300px) 100vw, 300px" />
<img src='$siteurl/wp-content/excluded.jpg' width='400' height='200' srcset="$siteurl/wp-content/image-300X150.jpg 300w, $siteurl/wp-content/image-600X300.jpg 600w" sizes="(max-width: 300px) 100vw, 300px" />
MARKUP;

        $expected = <<<MARKUP
<img src='$imgopthost/client/q_glossy,ret_img,w_400,h_200/$siteurl/wp-content/image.jpg' width='400' height='200' srcset="$imgopthost/client/q_glossy,ret_img,w_300/$siteurl/wp-content/image-300X150.jpg 300w, $imgopthost/client/q_glossy,ret_img,w_600/$siteurl/wp-content/image-600X300.jpg 600w" sizes="(max-width: 300px) 100vw, 300px" />
<img src='$siteurl/wp-content/excluded.jpg' width='400' height='200' srcset="$siteurl/wp-content/image-300X150.jpg 300w, $siteurl/wp-content/image-600X300.jpg 600w" sizes="(max-width: 300px) 100vw, 300px" />
MARKUP;
        $instance = autoptimizeImages::instance();
        $instance->set_options( $opts );
        $actual = $instance->filter_optimize_images( $markup, true );
        $this->assertEquals( $expected, $actual );
    }

    /**
     * Test image optimization in autoptimizeImages.php.
     *
     * case: picture tag
     */
    public function test_imgopt_picture()
    {
        $urls                                        = $this->get_urls();
        $siteurl                                     = $urls['siteurl'];
        $imgopthost                                  = $urls['imgopthost'];
        $opts                                        = autoptimizeImages::fetch_options();
        $opts['autoptimize_imgopt_checkbox_field_1'] = '1';
        $opts['autoptimize_imgopt_checkbox_field_3'] = '0';

        $markup = <<<MARKUP
<picture><source srcset="$siteurl/wp-content/image.jpg" media="(min-width: 800px)"><img src="$siteurl/wp-content/image.jpg"/></picture>
MARKUP;

        $expected = <<<MARKUP
<picture><source srcset="$imgopthost/client/q_glossy,ret_img/$siteurl/wp-content/image.jpg" media="(min-width: 800px)"><img src="$imgopthost/client/q_glossy,ret_img/$siteurl/wp-content/image.jpg"/></picture>
MARKUP;
        $instance = autoptimizeImages::instance();
        $instance->set_options( $opts );
        $actual = $instance->filter_optimize_images( $markup );
        $this->assertEquals( $expected, $actual );
    }

    /**
     * Test image optimization & lazyload in autoptimizeImages.php.
     *
     * case: picture tag
     */
    public function test_imgopt_lazyload_picture()
    {
        $urls                                        = $this->get_urls();
        $siteurl                                     = $urls['siteurl'];
        $imgopthost                                  = $urls['imgopthost'];
        $opts                                        = autoptimizeImages::fetch_options();
        $opts['autoptimize_imgopt_checkbox_field_1'] = '1';
        $opts['autoptimize_imgopt_checkbox_field_3'] = '1';

        $markup = <<<MARKUP
<picture><source srcset="$siteurl/wp-content/image.jpg" media="(min-width: 800px)"><img src="$siteurl/wp-content/image.jpg"/></picture>
MARKUP;

        $expected = <<<MARKUP
<picture><source data-srcset="$imgopthost/client/q_glossy,ret_img/$siteurl/wp-content/image.jpg" media="(min-width: 800px)"><noscript><img src="$imgopthost/client/q_glossy,ret_img/$siteurl/wp-content/image.jpg"/></noscript><img class="lazyload" src='$imgopthost/client/q_lqip,ret_wait/$siteurl/wp-content/image.jpg' data-src="$imgopthost/client/q_glossy,ret_img/$siteurl/wp-content/image.jpg"/></picture>
MARKUP;
        $instance = autoptimizeImages::instance();
        $instance->set_options( $opts );
        $actual = $instance->filter_optimize_images( $markup );
        $this->assertEquals( $expected, $actual );
    }

    /**
     * Test image optimization in autoptimizeImages.php.
     *
     * case: img with srcsets and lazyload
     */
    public function test_imgopt_with_lazyload()
    {
        $urls                                        = $this->get_urls();
        $siteurl                                     = $urls['siteurl'];
        $imgopthost                                  = $urls['imgopthost'];
        $opts                                        = autoptimizeImages::fetch_options();
        $opts['autoptimize_imgopt_checkbox_field_1'] = '1';
        $opts['autoptimize_imgopt_checkbox_field_3'] = '1';

        $markup = <<<MARKUP
<img src='$siteurl/wp-content/image.jpg' width='400' height='200' srcset="$siteurl/wp-content/image-300X150.jpg 300w, $siteurl/wp-content/image-600X300.jpg 600w" sizes="(max-width: 300px) 100vw, 300px" />
MARKUP;

        $expected = <<<MARKUP
<noscript><img src='$imgopthost/client/q_glossy,ret_img,w_400,h_200/$siteurl/wp-content/image.jpg' width='400' height='200' srcset="$imgopthost/client/q_glossy,ret_img,w_300/$siteurl/wp-content/image-300X150.jpg 300w, $imgopthost/client/q_glossy,ret_img,w_600/$siteurl/wp-content/image-600X300.jpg 600w" sizes="(max-width: 300px) 100vw, 300px" /></noscript><img class="lazyload" src='$imgopthost/client/q_lqip,ret_wait,w_400,h_200/$siteurl/wp-content/image.jpg' data-src='$imgopthost/client/q_glossy,ret_img,w_400,h_200/$siteurl/wp-content/image.jpg' width='400' height='200' data-srcset="$imgopthost/client/q_glossy,ret_img,w_300/$siteurl/wp-content/image-300X150.jpg 300w, $imgopthost/client/q_glossy,ret_img,w_600/$siteurl/wp-content/image-600X300.jpg 600w" data-sizes="(max-width: 300px) 100vw, 300px" />
MARKUP;

        $instance = autoptimizeImages::instance();
        $instance->set_options( $opts );
        $actual = $instance->filter_optimize_images( $markup );
        $this->assertEquals( $expected, $actual );
    }

    /**
     * Test image optimization in autoptimizeImages.php.
     *
     * case: background image in a style attribute
     */
    public function test_imgopt_bgimg()

This method seems to be duplicated in your project.

    {
        $urls                                        = $this->get_urls();
        $siteurl                                     = $urls['siteurl'];
        $imgopthost                                  = $urls['imgopthost'];
        $opts                                        = autoptimizeImages::fetch_options();
        $opts['autoptimize_imgopt_checkbox_field_1'] = '1';
        $opts['autoptimize_imgopt_checkbox_field_3'] = '0';

        $markup = <<<MARKUP
<div class="textwidget custom-html-widget"><div class="et_parallax_bg et_pb_parallax_css" style="height:200px; background-image: url($siteurl/wp-content/uploads/2018/05/DSC_1615-300x201.jpg);"></div>
MARKUP;

        $expected = <<<MARKUP
<div class="textwidget custom-html-widget"><div class="et_parallax_bg et_pb_parallax_css" style="height:200px; background-image: url($imgopthost/client/q_glossy,ret_img/$siteurl/wp-content/uploads/2018/05/DSC_1615-300x201.jpg);"></div>
MARKUP;

        $instance = autoptimizeImages::instance();
        $instance->set_options( $opts );
        $actual = $instance->filter_optimize_images( $markup );
        $this->assertEquals( $expected, $actual );
    }

    /**
     * Test lazyloading in autoptimizeImages.php.
     *
     * case: no image optimization
     */
    public function test_lazyload()
    {
        $urls                                        = $this->get_urls();
        $siteurl                                     = $urls['siteurl'];
        $imgopthost                                  = $urls['imgopthost'];
        $opts                                        = autoptimizeImages::fetch_options();
        $opts['autoptimize_imgopt_checkbox_field_3'] = '1';

        $markup = <<<MARKUP
<img src='$siteurl/wp-content/image.jpg' width='400' height='200' srcset="$siteurl/wp-content/image-300X150.jpg 300w, $siteurl/wp-content/image-600X300.jpg 600w" sizes="(max-width: 300px) 100vw, 300px" />
MARKUP;

        $expected = <<<MARKUP
<noscript><img src='$siteurl/wp-content/image.jpg' width='400' height='200' srcset="$siteurl/wp-content/image-300X150.jpg 300w, $siteurl/wp-content/image-600X300.jpg 600w" sizes="(max-width: 300px) 100vw, 300px" /></noscript><img class="lazyload" src='data:image/svg+xml,%3Csvg%20xmlns=%22http://www.w3.org/2000/svg%22%20viewBox=%220%200%20400%20200%22%3E%3C/svg%3E' data-src='$siteurl/wp-content/image.jpg' width='400' height='200' data-srcset="$siteurl/wp-content/image-300X150.jpg 300w, $siteurl/wp-content/image-600X300.jpg 600w" data-sizes="(max-width: 300px) 100vw, 300px" />
MARKUP;

        $instance = autoptimizeImages::instance();
        $instance->set_options( $opts );
        $actual = $instance->filter_lazyload_images( $markup );
        $this->assertEquals( $expected, $actual );
    }

    /**
     * Test lazyload in autoptimizeImages.php.
     *
     * case: picture tag
     */
    public function test_picture_lazyload()
    {
        $urls                                        = $this->get_urls();
        $siteurl                                     = $urls['siteurl'];
        $imgopthost                                  = $urls['imgopthost'];
        $opts                                        = autoptimizeImages::fetch_options();
        $opts['autoptimize_imgopt_checkbox_field_3'] = '1';

        $markup = <<<MARKUP
<picture><source srcset="$siteurl/wp-content/image.jpg" media="(min-width: 800px)"><img src="$siteurl/wp-content/image.jpg"/></picture>
MARKUP;

        $expected = <<<MARKUP
<picture><source data-srcset="$siteurl/wp-content/image.jpg" media="(min-width: 800px)"><noscript><img src="$siteurl/wp-content/image.jpg"/></noscript><img class="lazyload" src='data:image/svg+xml,%3Csvg%20xmlns=%22http://www.w3.org/2000/svg%22%20viewBox=%220%200%20210%20140%22%3E%3C/svg%3E' data-src="$siteurl/wp-content/image.jpg"/></picture>
MARKUP;

        $instance = autoptimizeImages::instance();
        $instance->set_options( $opts );
        $actual = $instance->filter_lazyload_images( $markup );
        $this->assertEquals( $expected, $actual );
    }

    /**
     * Test lazyload in autoptimizeImages.php.
     *
     * case: picture tag
     */
    public function test_bgimg_lazyload()
    {
        $urls                                        = $this->get_urls();
        $siteurl                                     = $urls['siteurl'];
        $imgopthost                                  = $urls['imgopthost'];
        $opts                                        = autoptimizeImages::fetch_options();
        $opts['autoptimize_imgopt_checkbox_field_3'] = '1';

        $markup = <<<MARKUP
<div id="just-an-id" style="height:250px;background-image: url(/wp-content/uploads/2018/05/DSC_1615-300x201.jpg);" class="hero background-image"></div>
MARKUP;

        $expected = <<<MARKUP
<div id="just-an-id" data-bg="/wp-content/uploads/2018/05/DSC_1615-300x201.jpg" style="height:250px;background-image: url(data:image/svg+xml,%3Csvg%20xmlns=%22http://www.w3.org/2000/svg%22%20viewBox=%220%200%20500%20300%22%3E%3C/svg%3E);" class="lazyload hero background-image"></div>
MARKUP;

        $instance = autoptimizeImages::instance();
        $instance->set_options( $opts );
        $actual = $instance->filter_lazyload_images( $markup );
        $this->assertEquals( $expected, $actual );
    }

    /**
     * Test image optimization in autoptimizeImages.php.
     *
     * Exception case: image served by .php, should not be proxied.
     */
    public function test_imgopt_php()
    {
        $opts                                        = autoptimizeImages::fetch_options();
        $opts['autoptimize_imgopt_checkbox_field_1'] = '1';
        $opts['autoptimize_imgopt_checkbox_field_3'] = '0';

        $markup = <<<MARKUP
<img src='/wp-content/plugins/imageplugin/image.php?id=16' width='400' height='200'>
MARKUP;

        $instance = autoptimizeImages::instance();
        $instance->set_options( $opts );
        $actual = $instance->filter_optimize_images( $markup );

        // Expecting $markup since replacement should not happen.
        $this->assertEquals( $markup, $actual );
    }

    /**
     * Test image optimization in autoptimizeImages.php.
     *
     * Alternate case: lazy loaded images with srcsets (using wp rocket variant HTML)
     */
    public function test_imgopt_alreadylazied()
    {
        $urls                                        = $this->get_urls();
        $siteurl                                     = $urls['siteurl'];
        $imgopthost                                  = $urls['imgopthost'];
        $opts                                        = autoptimizeImages::fetch_options();
        $opts['autoptimize_imgopt_checkbox_field_1'] = '1';
        $opts['autoptimize_imgopt_checkbox_field_3'] = '0';

        $markup = <<<MARKUP
<img src="data:image/gif;base64,R0lGODdhAQABAPAAAP///wAAACwAAAAAAQABAEACAkQBADs=" data-lazy-src='$siteurl/wp-content/image.jpg' width='400' height='200' data-lazy-srcset="$siteurl/wp-content/image-300X150.jpg 300w, $siteurl/wp-content/image-600X300.jpg 600w" sizes="(max-width: 300px) 100vw, 300px" />
MARKUP;

        $expected = <<<MARKUP
<img src="data:image/gif;base64,R0lGODdhAQABAPAAAP///wAAACwAAAAAAQABAEACAkQBADs=" data-lazy-src='$imgopthost/client/q_glossy,ret_img,w_400,h_200/$siteurl/wp-content/image.jpg' width='400' height='200' data-lazy-srcset="$imgopthost/client/q_glossy,ret_img,w_300/$siteurl/wp-content/image-300X150.jpg 300w, $imgopthost/client/q_glossy,ret_img,w_600/$siteurl/wp-content/image-600X300.jpg 600w" sizes="(max-width: 300px) 100vw, 300px" />
MARKUP;

        $instance = autoptimizeImages::instance();
        $instance->set_options( $opts );
        $actual = $instance->filter_optimize_images( $markup );

        $this->assertEquals( $expected, $actual );
    }

    /**
     * Test image optimization when image urls have no explict host provided.
     */
    public function test_imgopt_url_normalize_root_relative()
    {
        $urls                                        = $this->get_urls();
        $siteurl                                     = $urls['siteurl'];
        $siteurlparsed                               = parse_url( $siteurl );
        $sitedomain                                  = $siteurlparsed['scheme'] . '://' . $siteurlparsed['host'];
        $imgopthost                                  = $urls['imgopthost'];
        $opts                                        = autoptimizeImages::fetch_options();
        $opts['autoptimize_imgopt_checkbox_field_1'] = '1';
        $opts['autoptimize_imgopt_checkbox_field_3'] = '0';

        $markup = <<<MARKUP
<img src='/wp-content/image.jpg' width='400' height='200' srcset="/wp-content/image-300X150.jpg 300w, /wp-content/image-600X300.jpg 600w" sizes="(max-width: 300px) 100vw, 300px" />
MARKUP;

        $expected = <<<MARKUP
<img src='$imgopthost/client/q_glossy,ret_img,w_400,h_200/$sitedomain/wp-content/image.jpg' width='400' height='200' srcset="$imgopthost/client/q_glossy,ret_img,w_300/$sitedomain/wp-content/image-300X150.jpg 300w, $imgopthost/client/q_glossy,ret_img,w_600/$sitedomain/wp-content/image-600X300.jpg 600w" sizes="(max-width: 300px) 100vw, 300px" />
MARKUP;

        $instance = autoptimizeImages::instance();
        $instance->set_options( $opts );
        $actual = $instance->filter_optimize_images( $markup );

        $this->assertEquals( $expected, $actual );
    }

    /**
     * Test image optimization when image urls have a protocol-relative url.
     */
    public function test_imgopt_url_normalize_protocol_relative()
    {
        $urls                                        = $this->get_urls();
        $siteurl                                     = $urls['siteurl'];
        $prsiteurl                                   = $urls['prsiteurl'];
        $imgopthost                                  = $urls['imgopthost'];
        $opts                                        = autoptimizeImages::fetch_options();
        $opts['autoptimize_imgopt_checkbox_field_1'] = '1';
        $opts['autoptimize_imgopt_checkbox_field_3'] = '0';

        $markup = <<<MARKUP
<img src='$prsiteurl/wp-content/image.jpg' width='400' height='200' srcset="$prsiteurl/wp-content/image-300X150.jpg 300w, $prsiteurl/wp-content/image-600X300.jpg 600w" sizes="(max-width: 300px) 100vw, 300px" />
MARKUP;

        $expected = <<<MARKUP
<img src='$imgopthost/client/q_glossy,ret_img,w_400,h_200/$siteurl/wp-content/image.jpg' width='400' height='200' srcset="$imgopthost/client/q_glossy,ret_img,w_300/$siteurl/wp-content/image-300X150.jpg 300w, $imgopthost/client/q_glossy,ret_img,w_600/$siteurl/wp-content/image-600X300.jpg 600w" sizes="(max-width: 300px) 100vw, 300px" />
MARKUP;

        $instance = autoptimizeImages::instance();
        $instance->set_options( $opts );
        $actual = $instance->filter_optimize_images( $markup );

        $this->assertEquals( $expected, $actual );
    }

    /**
     * @dataProvider provider_str_is_valid_regex
     */
    public function test_str_is_valid_regex( $str, $expected )
    {
        $actual = autoptimizeUtils::str_is_valid_regex( $str );

        $this->assertEquals( $expected, $actual );
    }

    public function provider_str_is_valid_regex()
    {
        return [
            [ '<!--[if', false ],
            [ '&lt;--[if', false ],
            [ '/booya/i', true ],
            [ '~Valid(Regular)Expression~', true ],
        ];
    }

    /**
     * @dataProvider provider_protocol_relative_tests
     */
    public function test_is_protocol_relative( $str, $expected )
    {
        $actual = autoptimizeUtils::is_protocol_relative( $str );

        $this->assertEquals( $expected, $actual );
    }

    public function provider_protocol_relative_tests()
    {
        return [
            [ '//something-that-might-be-an-url-but-isnt-really', true ],
            [ '', false ],
            [ null, false ],
            [ 'booya/i', false ],
            [ '/root-relative', false ],
            [ 'http://what.ever/', false ],
            [ 'https://booya.kasha', false ],
            [ '1/', false ],
        ];
    }

    public function test_css_minifier_unmatched_parens()

This method seems to be duplicated in your project.

    {
        $css = <<<MARKUP
img.centered, .aligncenter {
    -webkit-box-shadow: none;
    -moz-box-shadow: none;
    box-shadow: none;
MARKUP;

        $expected = 'img.centered,.aligncenter{-webkit-box-shadow:none;-moz-box-shadow:none;box-shadow:none}';

        $instance = new autoptimizeStyles( $css );
        $minified = $instance->run_minifier_on( $css );

        $this->assertEquals( $expected, $minified );
    }

    public function test_css_font_names_mangling()
    {
        // Properly quoted font names dont get mangled.
        $css      = 'h2{font-family:"Archivo Black"}';
        $instance = new autoptimizeStyles( $css );
        $actual   = $instance->run_minifier_on( $css );
        $this->assertEquals( $css, $actual );

        // When not quoted, 'Black' used to become '#000', but not anymore :) ...
        $css_unquoted = 'h2{font-family:Archivo Black;}';
        $expected     = 'h2{font-family:Archivo Black}';
        $instance     = new autoptimizeStyles( $css_unquoted );
        $actual       = $instance->run_minifier_on( $css_unquoted );
        $this->assertEquals( $expected, $actual );

        $css_unquoted = 'h1{font:italic 1.2em Fira White,serif}';
        $instance     = new autoptimizeStyles( $css_unquoted );
        $actual       = $instance->run_minifier_on( $css_unquoted );
        $this->assertEquals( $css_unquoted, $actual );
    }

    public function test_is_plugin_active_utils_wrapper()
    {
        // Our plugin is loaded via "muplugins_loaded" filter in tests/bootstrap.php.
        $this->assertFalse( autoptimizeUtils::is_plugin_active( 'autoptimize/autoptimize.php' ) );
        $this->assertFalse( autoptimizeUtils::is_plugin_active( 'async-javascript/async-javascript.php' ) );
    }

    public function test_jsminphp_string_literal_minification()
    {
        $js = '
// comment
`line
break` + `he  llo`; foo`hel( \'\');lo`; `he\nl\`lo`; (`he${one + two}`)
';

        $expected = '`line
break`+`he  llo`;foo`hel( \'\');lo`;`he\nl\`lo`;(`he${one + two}`)';

        $actual = JSMin::minify( $js );
        $this->assertEquals( $expected, $actual );
    }

    /**
     * Test preloading of resources (e.g. fonts).
     */
    public function test_preload()
    {
        $opts                                   = autoptimizeExtra::fetch_options();
        $opts['autoptimize_extra_text_field_7'] = 'https://whatever.com/fonts/openfuttta.woff2, https://whatever.com/css/openfuttta.css';

        $markup = <<<MARKUP
<html><link rel="stylesheet" href="xyz.css">
MARKUP;

        $expected = <<<MARKUP
<html><link rel="preload" href="https://whatever.com/fonts/openfuttta.woff2" as="font" type="font/woff2" crossorigin><link rel="preload" href="https://whatever.com/css/openfuttta.css" as="style"><link rel="stylesheet" href="xyz.css">
MARKUP;

        $instance = autoptimizeExtra::instance();
        $instance->set_options( $opts );
        $actual = $instance->filter_preload( $markup );
        $this->assertEquals( $expected, $actual );
    }

    /**
     * Test preloading of resources (e.g. fonts).
     */
    public function test_preload_withqs()
    {
        $opts                                   = autoptimizeExtra::fetch_options();
        $opts['autoptimize_extra_text_field_7'] = 'https://whatever.com/fonts/openfuttta.woff2?123#abc, https://whatever.com/css/openfuttta.css?v=124';

        $markup = <<<MARKUP
<html><link rel="stylesheet" href="xyz.css">
MARKUP;

        $expected = <<<MARKUP
<html><link rel="preload" href="https://whatever.com/fonts/openfuttta.woff2?123#abc" as="font" type="font/woff2" crossorigin><link rel="preload" href="https://whatever.com/css/openfuttta.css?v=124" as="style"><link rel="stylesheet" href="xyz.css">
MARKUP;

        $instance = autoptimizeExtra::instance();
        $instance->set_options( $opts );
        $actual = $instance->filter_preload( $markup );
        $this->assertEquals( $expected, $actual );
    }

    /**
     * Test aggregating Google Fonts.
     */
    public function test_google_font_aggregate_preload()
    {
        $opts                                    = autoptimizeExtra::fetch_options();
        $opts['autoptimize_extra_radio_field_4'] = '5';

        $markup = <<<MARKUP
<link href='//fonts.googleapis.com/css?family=Open+Sans:300italic,400italic,600italic,400,300,600&subset=latin,cyrillic-ext,greek-ext,greek,vietnamese,latin-ext,cyrillic' rel='stylesheet' type='text/css'><link rel='stylesheet' type='text/css' href='https://fonts.googleapis.com/css2?family=Crimson+Pro:ital,wght@0,700;1,400'><link rel="dummy">
MARKUP;

        $expected = <<<MARKUP
<link rel="stylesheet" media="print" onload="this.onload=null;this.media='all';" id="ao_optimized_gfonts" href="https://fonts.googleapis.com/css?family=Open+Sans:300italic,400italic,600italic,400,300,600%7CCrimson+Pro:700,italic400&#038;subset=latin%2Ccyrillic-ext%2Cgreek-ext%2Cgreek%2Cvietnamese%2Clatin-ext%2Ccyrillic&amp;display=swap" /><link rel="dummy">
MARKUP;

        $instance = autoptimizeExtra::instance();
        $instance->set_options( $opts );
        $actual = $instance->filter_optimize_google_fonts( $markup );
        $this->assertEquals( $expected, $actual );
    }

    /**
     * Test network vs site settings: network only.
     */
    public function test_network_no_site_settings()
    {
        if ( is_multisite() ) {
            define( 'TEST_MULTISITE_FORCE_AO_ON_NETWORK', true );
            // set options through WordPress core methods.
            update_option( 'autoptimize_js_exclude', 'site' );
            update_network_option( get_main_network_id(), 'autoptimize_js_exclude', 'network' );
            update_network_option( get_main_network_id(), 'autoptimize_enable_site_config', '' );

            // and then try fetching them through optionwrapper.
            $expected = 'network';
            $actual   = autoptimizeOptionWrapper::get_option( 'autoptimize_js_exclude' );
            $this->assertEquals( $expected, $actual );
        } else {
            $this->assertEquals( 1, 1 ); // just to ensure this isn't marked as a risky test.
        }
    }

    /**
     * Test network vs site settings; per site.
     */
    public function test_network_per_site_settings()
    {
        if ( is_multisite() ) {
            // define of TEST_MULTISITE_FORCE_AO_ON_NETWORK not needed, done in previous test.
            // set options through WordPress core methods.
            update_option( 'autoptimize_js_exclude', 'site' );
            update_network_option( get_main_network_id(), 'autoptimize_js_exclude', 'network' );
            update_network_option( get_main_network_id(), 'autoptimize_enable_site_config', 'on' );

            // and then try fetching them through optionwrapper.
            $expected = 'site';
            $actual   = autoptimizeOptionWrapper::get_option( 'autoptimize_js_exclude' );
            $this->assertEquals( $expected, $actual );
        } else {
            $this->assertEquals( 1, 1 ); // just to ensure this isn't marked as a risky test.
        }
    }
}