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 // phpcs:ignore WordPress.Files.FileName.InvalidClassFileName  | 
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| 18 | class Test_Status extends TestCase { | 
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| 19 | /**  | 
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| 20 | * Default site URL.  | 
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| 21 | *  | 
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| 22 | * @var string  | 
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| 23 | */  | 
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| 24 | private $site_url = 'https://yourjetpack.blog';  | 
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| 25 | |||
| 26 | /**  | 
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| 27 | * Status instance.  | 
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| 28 | *  | 
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| 29 | * @var Automattic\Jetpack\Status  | 
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| 30 | */  | 
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| 31 | private $status_obj;  | 
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| 32 | |||
| 33 | /**  | 
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| 34 | * Mocked constants.  | 
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| 35 | *  | 
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| 36 | * @var array  | 
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| 37 | */  | 
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| 38 | private $mocked_constants = array();  | 
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| 39 | |||
| 40 | /**  | 
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| 41 | * Setup before running any of the tests.  | 
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| 42 | *  | 
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| 43 | * @beforeClass  | 
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| 44 | */  | 
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| 45 | 	public static function set_up_before_class() { | 
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| 50 | |||
| 51 | /**  | 
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| 52 | * Test setup.  | 
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| 53 | *  | 
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| 54 | * @before  | 
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| 55 | */  | 
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| 56 | 	public function set_up() { | 
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| 76 | |||
| 77 | /**  | 
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| 78 | * Test teardown.  | 
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| 79 | *  | 
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| 80 | * @after  | 
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| 81 | */  | 
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| 82 | 	public function tear_down() { | 
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| 85 | |||
| 86 | /**  | 
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| 87 | * Test is_offline_mode when not using any filter  | 
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| 88 | *  | 
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| 89 | * @covers Automattic\Jetpack\Status::is_offline_mode  | 
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| 90 | */  | 
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| 91 | 	public function test_is_offline_mode_default() { | 
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| 96 | |||
| 97 | /**  | 
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| 98 | * Test is_offline_mode when using the jetpack_offline_mode filter  | 
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| 99 | *  | 
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| 100 | * @covers Automattic\Jetpack\Status::is_offline_mode  | 
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| 101 | */  | 
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| 102 | 	public function test_is_offline_mode_filter_true() { | 
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| 107 | |||
| 108 | /**  | 
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| 109 | * Test when using a bool value for the jetpack_offline_mode filter.  | 
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| 110 | *  | 
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| 111 | * @covers Automattic\Jetpack\Status::is_offline_mode  | 
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| 112 | */  | 
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| 113 | 	public function test_is_offline_mode_filter_bool() { | 
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| 118 | |||
| 119 | /**  | 
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| 120 | * Test when site url is localhost (dev mode on)  | 
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| 121 | *  | 
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| 122 | * @covers Automattic\Jetpack\Status::is_offline_mode  | 
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| 123 | */  | 
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| 124 | 	public function test_is_offline_mode_localhost() { | 
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| 131 | |||
| 132 | /**  | 
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| 133 | * Test when wp_get_environment_type is local.  | 
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| 134 | *  | 
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| 135 | * @covers Automattic\Jetpack\Status::is_local_site  | 
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| 136 | */  | 
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| 137 | 	public function test_is_local_wp_get_environment_type_local() { | 
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| 144 | |||
| 145 | /**  | 
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| 146 | * Test when wp_get_environment_type is local.  | 
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| 147 | *  | 
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| 148 | * @covers Automattic\Jetpack\Status::is_staging_site  | 
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| 149 | */  | 
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| 150 | View Code Duplication | 	public function test_is_staging_wp_get_environment_type_local() { | 
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| 157 | |||
| 158 | /**  | 
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| 159 | * Test when wp_get_environment_type is staging.  | 
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| 160 | *  | 
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| 161 | * @covers Automattic\Jetpack\Status::is_staging_site  | 
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| 162 | */  | 
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| 163 | View Code Duplication | 	public function test_is_staging_wp_get_environment_type_staging() { | 
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| 170 | |||
| 171 | /**  | 
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| 172 | * Test when wp_get_environment_type is production.  | 
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| 173 | *  | 
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| 174 | * @covers Automattic\Jetpack\Status::is_staging_site  | 
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| 175 | */  | 
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| 176 | View Code Duplication | 	public function test_is_staging_wp_get_environment_type_production() { | 
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| 183 | |||
| 184 | /**  | 
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| 185 | * Test when wp_get_environment_type is a random value.  | 
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| 186 | *  | 
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| 187 | * @covers Automattic\Jetpack\Status::is_staging_site  | 
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| 188 | */  | 
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| 189 | View Code Duplication | 	public function test_is_staging_wp_get_environment_type_random() { | 
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| 196 | |||
| 197 | /**  | 
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| 198 | * Test when using the constant to set dev mode  | 
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| 199 | *  | 
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| 200 | * @covers Automattic\Jetpack\Status::is_offline_mode  | 
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| 201 | *  | 
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| 202 | * @runInSeparateProcess  | 
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| 203 | */  | 
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| 204 | 	public function test_is_offline_mode_constant() { | 
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| 210 | |||
| 211 | /**  | 
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| 212 | * Test for is_multi_network with a single site  | 
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| 213 | *  | 
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| 214 | * @covers Automattic\Jetpack\Status::is_multi_network  | 
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| 215 | */  | 
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| 216 | 	public function test_is_multi_network_not_multisite() { | 
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| 221 | |||
| 222 | /**  | 
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| 223 | * Test is_multi_network with a multisite install  | 
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| 224 | *  | 
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| 225 | * @covers Automattic\Jetpack\Status::is_multi_network  | 
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| 226 | */  | 
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| 227 | 	public function test_is_multi_network_when_single_network() { | 
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| 235 | |||
| 236 | /**  | 
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| 237 | * Test is_multi_network when multiple networks  | 
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| 238 | *  | 
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| 239 | * @covers Automattic\Jetpack\Status::is_multi_network  | 
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| 240 | */  | 
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| 241 | View Code Duplication | 	public function test_is_multi_network_when_multiple_networks() { | 
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| 249 | |||
| 250 | /**  | 
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| 251 | * Test cached is_single_user_site  | 
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| 252 | *  | 
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| 253 | * @covers Automattic\Jetpack\Status::is_single_user_site  | 
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| 254 | */  | 
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| 255 | 	public function test_is_single_user_site_with_transient() { | 
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| 263 | |||
| 264 | /**  | 
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| 265 | * Test is_single_user_site  | 
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| 266 | *  | 
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| 267 | * @covers Automattic\Jetpack\Status::is_single_user_site  | 
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| 268 | */  | 
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| 269 | View Code Duplication | 	public function test_is_single_user_site_with_one_user() { | 
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| 278 | |||
| 279 | /**  | 
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| 280 | * Test is_single_user_site with multiple users  | 
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| 281 | *  | 
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| 282 | * @covers Automattic\Jetpack\Status::is_single_user_site  | 
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| 283 | */  | 
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| 284 | View Code Duplication | 	public function test_is_single_user_site_with_multiple_users() { | 
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| 293 | |||
| 294 | /**  | 
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| 295 | * Mock $wpdb->get_var() and make it return a certain value.  | 
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| 296 | *  | 
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| 297 | * @param mixed $return_value Return value of the function.  | 
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| 298 | *  | 
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| 299 | * PHPUnit\Framework\MockObject\MockObject The mock object.  | 
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| 300 | */  | 
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| 301 | 	protected function mock_wpdb_get_var( $return_value = null ) { | 
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| 315 | |||
| 316 | /**  | 
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| 317 | * Clean up the existing $wpdb->get_var() mock.  | 
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| 318 | */  | 
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| 319 | 	protected function clean_mock_wpdb_get_var() { | 
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| 323 | |||
| 324 | /**  | 
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| 325 | * Tests known staging sites.  | 
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| 326 | *  | 
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| 327 | * @dataProvider get_is_staging_site_known_hosting_providers_data  | 
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| 328 | * @covers Automattic\Jetpack\Status::is_staging_site  | 
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| 329 | *  | 
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| 330 | * @param string $site_url Site URL.  | 
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| 331 | * @param bool $expected Expected return.  | 
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| 332 | */  | 
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| 333 | 	public function test_is_staging_site_for_known_hosting_providers( $site_url, $expected ) { | 
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| 346 | |||
| 347 | /**  | 
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| 348 | * Known hosting providers.  | 
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| 349 | *  | 
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| 350 | * Including a couple of general RegEx checks (subdir, ending slash).  | 
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| 351 | *  | 
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| 352 | * @return array  | 
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| 353 | */  | 
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| 354 | 	public function get_is_staging_site_known_hosting_providers_data() { | 
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| 386 | |||
| 387 | /**  | 
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| 388 | * Tests known local development sites.  | 
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| 389 | *  | 
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| 390 | * @dataProvider get_is_local_site_known_tld  | 
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| 391 | *  | 
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| 392 | * @param string $site_url Site URL.  | 
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| 393 | * @param bool $expected_response Expected response.  | 
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| 394 | */  | 
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| 395 | 	public function test_is_local_site_for_known_tld( $site_url, $expected_response ) { | 
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| 408 | |||
| 409 | /**  | 
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| 410 | * Known hosting providers.  | 
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| 411 | *  | 
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| 412 | * @return array  | 
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| 413 | */  | 
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| 414 | 	public function get_is_local_site_known_tld() { | 
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| 442 | |||
| 443 | /**  | 
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| 444 | * Tests for site_suffix().  | 
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| 445 | *  | 
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| 446 | * @covers Automattic\Jetpack\Status::get_site_suffix  | 
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| 447 | * @dataProvider get_site_suffix_examples  | 
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| 448 | *  | 
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| 449 | * @param string $site Given site URL.  | 
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| 450 | * @param string $expected Site suffix.  | 
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| 451 | */  | 
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| 452 | 	public function test_jetpack_get_site_suffix( $site, $expected ) { | 
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| 458 | |||
| 459 | /**  | 
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| 460 | * Examples of sites passed to get_site_suffix  | 
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| 461 | *  | 
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| 462 | * @covers Automattic\Jetpack\Status::get_site_suffix  | 
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| 463 | */  | 
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| 464 | 	public function get_site_suffix_examples() { | 
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| 496 | }  | 
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| 497 | 
Our type inference engine has found an assignment to a property that is incompatible with the declared type of that property.
Either this assignment is in error or the assigned type should be added to the documentation/type hint for that property..