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 |
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| 19 | class Test_Jetpack_Admin_Menu extends WP_UnitTestCase { |
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| 20 | |||
| 21 | /** |
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| 22 | * Menu data fixture. |
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| 23 | * |
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| 24 | * @var array |
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| 25 | */ |
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| 26 | public static $menu_data; |
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| 27 | |||
| 28 | /** |
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| 29 | * Submenu data fixture. |
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| 30 | * |
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| 31 | * @var array |
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| 32 | */ |
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| 33 | public static $submenu_data; |
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| 34 | |||
| 35 | /** |
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| 36 | * Test domain. |
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| 37 | * |
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| 38 | * @var string |
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| 39 | */ |
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| 40 | public static $domain; |
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| 41 | |||
| 42 | /** |
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| 43 | * Whether this testsuite is run on WP.com. |
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| 44 | * |
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| 45 | * @var bool |
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| 46 | */ |
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| 47 | public static $is_wpcom; |
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| 48 | |||
| 49 | /** |
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| 50 | * Admin menu instance. |
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| 51 | * |
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| 52 | * @var Jetpack_Admin_Menu |
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| 53 | */ |
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| 54 | public static $admin_menu; |
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| 55 | |||
| 56 | /** |
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| 57 | * Mock user ID. |
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| 58 | * |
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| 59 | * @var int |
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| 60 | */ |
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| 61 | private static $user_id = 0; |
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| 62 | |||
| 63 | /** |
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| 64 | * Create shared fixtures. |
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| 65 | * |
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| 66 | * @param WP_UnitTest_Factory $factory Fixture factory. |
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| 67 | */ |
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| 68 | View Code Duplication | public static function wpSetUpBeforeClass( $factory ) { |
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| 75 | |||
| 76 | /** |
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| 77 | * Set up data. |
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| 78 | */ |
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| 79 | View Code Duplication | public function setUp() { |
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| 91 | |||
| 92 | /** |
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| 93 | * Tests add_jetpack_menu |
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| 94 | * |
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| 95 | * @covers ::add_jetpack_menu |
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| 96 | */ |
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| 97 | public function test_add_jetpack_menu() { |
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| 98 | global $submenu; |
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| 99 | |||
| 100 | static::$admin_menu->add_jetpack_menu(); |
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| 101 | |||
| 102 | $domains_submenu_item = array( |
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| 103 | 'Scan', |
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| 104 | 'manage_options', |
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| 105 | 'https://wordpress.com/scan/' . static::$domain, |
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| 106 | 'Scan', |
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| 107 | ); |
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| 108 | $this->assertContains( $domains_submenu_item, $submenu[ 'https://wordpress.com/activity-log/' . static::$domain ] ); |
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| 109 | } |
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| 110 | |||
| 111 | /** |
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| 112 | * Tests add_tools_menu |
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| 113 | * |
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| 114 | * @covers ::add_tools_menu |
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| 115 | */ |
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| 116 | public function test_add_tools_menu() { |
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| 140 | |||
| 141 | /** |
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| 142 | * Tests add_wp_admin_menu |
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| 143 | * |
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| 144 | * @covers ::add_wp_admin_menu |
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| 145 | */ |
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| 146 | public function test_add_wp_admin_menu() { |
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| 162 | } |
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| 163 |
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
getSomeVariable()on that sub-class, you will receive a runtime error:In the case above, it makes sense to update
SomeClassto useselfinstead: