Duplicate code is one of the most pungent code smells. A rule that is often used is to re-structure code once it is duplicated in three or more places.
Common duplication problems, and corresponding solutions are:
| 1 | <?php | ||
| 19 | class Test_Atomic_Admin_Menu extends WP_UnitTestCase { | ||
| 20 | |||
| 21 | /** | ||
| 22 | * Menu data fixture. | ||
| 23 | * | ||
| 24 | * @var array | ||
| 25 | */ | ||
| 26 | public static $menu_data; | ||
| 27 | |||
| 28 | /** | ||
| 29 | * Submenu data fixture. | ||
| 30 | * | ||
| 31 | * @var array | ||
| 32 | */ | ||
| 33 | public static $submenu_data; | ||
| 34 | |||
| 35 | /** | ||
| 36 | * Test domain. | ||
| 37 | * | ||
| 38 | * @var string | ||
| 39 | */ | ||
| 40 | public static $domain; | ||
| 41 | |||
| 42 | /** | ||
| 43 | * Whether this testsuite is run on WP.com. | ||
| 44 | * | ||
| 45 | * @var bool | ||
| 46 | */ | ||
| 47 | public static $is_wpcom; | ||
| 48 | |||
| 49 | /** | ||
| 50 | * Admin menu instance. | ||
| 51 | * | ||
| 52 | * @var Atomic_Admin_Menu | ||
| 53 | */ | ||
| 54 | public static $admin_menu; | ||
| 55 | |||
| 56 | /** | ||
| 57 | * Mock user ID. | ||
| 58 | * | ||
| 59 | * @var int | ||
| 60 | */ | ||
| 61 | private static $user_id = 0; | ||
| 62 | |||
| 63 | /** | ||
| 64 | * Create shared fixtures. | ||
| 65 | * | ||
| 66 | * @param WP_UnitTest_Factory $factory Fixture factory. | ||
| 67 | */ | ||
| 68 | View Code Duplication | 	public static function wpSetUpBeforeClass( $factory ) { | |
| 69 | static::$domain = ( new Status() )->get_site_suffix(); | ||
| 70 | static::$user_id = $factory->user->create( array( 'role' => 'administrator' ) ); | ||
|  | |||
| 71 | static::$menu_data = get_wpcom_menu_fixture(); | ||
| 72 | static::$submenu_data = get_submenu_fixture(); | ||
| 73 | } | ||
| 74 | |||
| 75 | /** | ||
| 76 | * Set up data. | ||
| 77 | */ | ||
| 78 | View Code Duplication | 	public function setUp() { | |
| 79 | parent::setUp(); | ||
| 80 | global $menu, $submenu; | ||
| 81 | |||
| 82 | // Initialize in setUp so it registers hooks for every test. | ||
| 83 | static::$admin_menu = Atomic_Admin_Menu::get_instance(); | ||
| 84 | |||
| 85 | $menu = static::$menu_data; | ||
| 86 | $submenu = static::$submenu_data; | ||
| 87 | |||
| 88 | wp_set_current_user( static::$user_id ); | ||
| 89 | } | ||
| 90 | |||
| 91 | /** | ||
| 92 | * Test get_instance. | ||
| 93 | * | ||
| 94 | * @covers ::get_instance | ||
| 95 | * @covers ::__construct | ||
| 96 | */ | ||
| 97 | View Code Duplication | 	public function test_get_instance() { | |
| 98 | $instance = Atomic_Admin_Menu::get_instance(); | ||
| 99 | |||
| 100 | $this->assertInstanceOf( Atomic_Admin_Menu::class, $instance ); | ||
| 101 | $this->assertSame( $instance, static::$admin_menu ); | ||
| 102 | |||
| 103 | $this->assertSame( 99999, has_action( 'admin_menu', array( $instance, 'reregister_menu_items' ) ) ); | ||
| 104 | $this->assertSame( 10, has_action( 'admin_enqueue_scripts', array( $instance, 'enqueue_scripts' ) ) ); | ||
| 105 | } | ||
| 106 | |||
| 107 | /** | ||
| 108 | * Tests add_browse_sites_link. | ||
| 109 | * | ||
| 110 | * @covers ::add_browse_sites_link | ||
| 111 | */ | ||
| 112 | 	public function test_add_browse_sites_link() { | ||
| 113 | global $menu; | ||
| 114 | |||
| 115 | // No output when executed in single site mode. | ||
| 116 | static::$admin_menu->add_browse_sites_link(); | ||
| 117 | $this->assertArrayNotHasKey( 0, $menu ); | ||
| 118 | } | ||
| 119 | |||
| 120 | /** | ||
| 121 | * Tests add_browse_sites_link. | ||
| 122 | * | ||
| 123 | * @covers ::add_browse_sites_link | ||
| 124 | */ | ||
| 125 | 	public function test_add_browse_sites_link_multisite() { | ||
| 126 | 		if ( ! is_multisite() ) { | ||
| 127 | $this->markTestSkipped( 'Only used on multisite' ); | ||
| 128 | } | ||
| 129 | |||
| 130 | global $menu; | ||
| 131 | |||
| 132 | // No output when user has just one site. | ||
| 133 | static::$admin_menu->add_browse_sites_link(); | ||
| 134 | $this->assertArrayNotHasKey( 0, $menu ); | ||
| 135 | |||
| 136 | // Give user a second site. | ||
| 137 | update_user_option( static::$user_id, 'wpcom_site_count', 2 ); | ||
| 138 | |||
| 139 | static::$admin_menu->add_browse_sites_link(); | ||
| 140 | |||
| 141 | $browse_sites_menu_item = array( | ||
| 142 | 'Browse sites', | ||
| 143 | 'read', | ||
| 144 | 'https://wordpress.com/home', | ||
| 145 | 'site-switcher', | ||
| 146 | 'menu-top toplevel_page_https://wordpress.com/home', | ||
| 147 | 'toplevel_page_https://wordpress.com/home', | ||
| 148 | 'dashicons-arrow-left-alt2', | ||
| 149 | ); | ||
| 150 | $this->assertSame( $menu[0], $browse_sites_menu_item ); | ||
| 151 | |||
| 152 | delete_user_option( static::$user_id, 'wpcom_site_count' ); | ||
| 153 | } | ||
| 154 | |||
| 155 | /** | ||
| 156 | * Tests add_new_site_link. | ||
| 157 | * | ||
| 158 | * @covers ::add_new_site_link | ||
| 159 | */ | ||
| 160 | 	public function test_add_new_site_link() { | ||
| 161 | global $menu; | ||
| 162 | |||
| 163 | // Set jetpack user data. | ||
| 164 | update_user_option( static::$user_id, 'wpcom_site_count', 1 ); | ||
| 165 | |||
| 166 | static::$admin_menu->add_new_site_link(); | ||
| 167 | |||
| 168 | $new_site_menu_item = array( | ||
| 169 | 'Add new site', | ||
| 170 | 'read', | ||
| 171 | 'https://wordpress.com/start?ref=calypso-sidebar', | ||
| 172 | 'Add new site', | ||
| 173 | 'menu-top toplevel_page_https://wordpress.com/start?ref=calypso-sidebar', | ||
| 174 | 'toplevel_page_https://wordpress.com/start?ref=calypso-sidebar', | ||
| 175 | 'dashicons-plus-alt', | ||
| 176 | ); | ||
| 177 | $this->assertSame( $menu[1002], $new_site_menu_item ); // 1001 is the separator position, 1002 is the link position | ||
| 178 | |||
| 179 | delete_user_option( static::$user_id, 'wpcom_site_count' ); | ||
| 180 | } | ||
| 181 | |||
| 182 | /** | ||
| 183 | * Tests add_site_card_menu | ||
| 184 | * | ||
| 185 | * @covers ::add_site_card_menu | ||
| 186 | */ | ||
| 187 | 	public function test_add_site_card_menu() { | ||
| 188 | global $menu; | ||
| 189 | |||
| 190 | 		if ( ! function_exists( 'site_is_private' ) ) { | ||
| 191 | 			function site_is_private() { // phpcs:ignore | ||
| 194 | } | ||
| 195 | static::$admin_menu->add_site_card_menu(); | ||
| 196 | |||
| 197 | $home_url = home_url(); | ||
| 198 | $site_card_menu_item = array( | ||
| 199 | // phpcs:ignore Squiz.Strings.DoubleQuoteUsage.NotRequired | ||
| 200 | ' | ||
| 214 | |||
| 215 | /** | ||
| 216 | * Tests set_site_card_menu_class | ||
| 217 | * | ||
| 218 | * @covers ::set_site_card_menu_class | ||
| 219 | */ | ||
| 220 | 	public function test_set_site_card_menu_class() { | ||
| 246 | |||
| 247 | /** | ||
| 248 | * Shim wpcomsh fallback site icon. | ||
| 249 | * | ||
| 250 | * @return string | ||
| 251 | */ | ||
| 252 | 	public function wpcomsh_site_icon_url() { | ||
| 255 | |||
| 256 | /** | ||
| 257 | * Custom site icon. | ||
| 258 | * | ||
| 259 | * @return string | ||
| 260 | */ | ||
| 261 | 	public function custom_site_icon_url() { | ||
| 264 | |||
| 265 | /** | ||
| 266 | * Tests add_upgrades_menu | ||
| 267 | * | ||
| 268 | * @covers ::add_upgrades_menu | ||
| 269 | */ | ||
| 270 | 	public function test_add_upgrades_menu() { | ||
| 277 | |||
| 278 | /** | ||
| 279 | * Tests add_tools_menu | ||
| 280 | * | ||
| 281 | * @covers ::add_tools_menu | ||
| 282 | */ | ||
| 283 | 	public function test_add_tools_menu() { | ||
| 291 | |||
| 292 | /** | ||
| 293 | * Tests add_options_menu | ||
| 294 | * | ||
| 295 | * @covers ::add_options_menu | ||
| 296 | */ | ||
| 297 | 	public function test_add_options_menu() { | ||
| 314 | |||
| 315 | /** | ||
| 316 | * Tests add_plugins_menu | ||
| 317 | * | ||
| 318 | * @covers ::add_plugins_menu | ||
| 319 | */ | ||
| 320 | 	public function test_add_plugins_menu() { | ||
| 328 | |||
| 329 | /** | ||
| 330 | * Tests add_appearance_menu | ||
| 331 | * | ||
| 332 | * @covers ::add_appearance_menu | ||
| 333 | */ | ||
| 334 | 	public function test_add_appearance_menu() { | ||
| 351 | |||
| 352 | /** | ||
| 353 | * Tests add_users_menu | ||
| 354 | * | ||
| 355 | * @covers ::add_users_menu | ||
| 356 | */ | ||
| 357 | View Code Duplication | 	public function test_add_users_menu() { | |
| 370 | |||
| 371 | /** | ||
| 372 | * Tests add_gutenberg_menus | ||
| 373 | * | ||
| 374 | * @covers ::add_gutenberg_menus | ||
| 375 | */ | ||
| 376 | 	public function test_add_gutenberg_menus() { | ||
| 383 | } | ||
| 384 | 
Let’s assume you have a class which uses late-static binding:
The code above will run fine in your PHP runtime. However, if you now create a sub-class and call the
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