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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17 | class Test_Base_Admin_Menu extends WP_UnitTestCase { |
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18 | |||
19 | /** |
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20 | * Admin menu instance. |
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21 | * |
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22 | * @var Base_Admin_Menu |
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23 | */ |
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24 | public static $admin_menu; |
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25 | |||
26 | /** |
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27 | * Mock user ID. |
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28 | * |
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29 | * @var int |
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30 | */ |
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31 | private static $user_id = 0; |
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32 | |||
33 | /** |
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34 | * Menu data fixture. |
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35 | * |
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36 | * @var array |
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37 | */ |
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38 | public static $menu_data; |
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39 | |||
40 | /** |
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41 | * Submenu data fixture. |
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42 | * |
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43 | * @var array |
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44 | */ |
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45 | public static $submenu_data; |
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46 | |||
47 | /** |
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48 | * Create shared fixtures. |
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49 | * |
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50 | * @param WP_UnitTest_Factory $factory Fixture factory. |
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51 | */ |
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52 | public static function wpSetUpBeforeClass( $factory ) { |
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57 | |||
58 | /** |
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59 | * Set up data. |
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60 | */ |
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61 | public function setUp() { |
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71 | |||
72 | /** |
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73 | * Test get_instance. |
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74 | * |
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75 | * @covers ::get_instance |
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76 | * @covers ::__construct |
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77 | */ |
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78 | View Code Duplication | public function test_get_instance() { |
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90 | |||
91 | /** |
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92 | * Tests add_admin_menu_separator |
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93 | * |
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94 | * @covers ::add_admin_menu_separator |
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95 | */ |
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96 | public function test_add_admin_menu_separator() { |
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115 | |||
116 | /** |
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117 | * Get an object of Base_Admin_Menu |
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118 | * |
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119 | * @return Base_Admin_Menu |
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120 | */ |
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121 | private function get_concrete_menu_admin() { |
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124 | } |
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125 |
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
SomeClass
to useself
instead: