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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8 | trait JsonApiAssertions |
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9 | { |
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10 | /** |
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11 | * Assert that all given keys are set in an associative array. Nested |
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12 | * members may be specified using dot notation. |
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13 | * |
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14 | * @param array $keys |
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15 | * @param array $array |
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16 | * |
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17 | * @throws PHPUnit_Framework_AssertionFailedError |
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18 | */ |
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19 | public function assertArrayHasAll(array $keys, array $array) |
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27 | |||
28 | /** |
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29 | * Assert that an array contains a valid JSON API resource identifier. |
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30 | * |
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31 | * @param array $array |
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32 | * |
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33 | * @throws PHPUnit_Framework_AssertionFailedError |
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34 | */ |
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35 | public function assertJsonApiResourceIdentifier(array $array) |
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39 | |||
40 | /** |
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41 | * Assert that an array contains a valid JSON API resource object. |
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42 | * |
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43 | * @param array $array |
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44 | * |
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45 | * @throws PHPUnit_Framework_AssertionFailedError |
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46 | */ |
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47 | public function assertJsonApiResourceObject(array $array) |
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51 | |||
52 | /** |
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53 | * Assert that an array contains a valid JSON API resource identifier |
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54 | * object collection. |
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55 | * |
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56 | * @param array $array |
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57 | * @param int $count |
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58 | * |
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59 | * @throws PHPUnit_Framework_AssertionFailedError |
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60 | */ |
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61 | View Code Duplication | public function assertJsonApiIdentifierCollection(array $array, $count = null) |
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71 | |||
72 | /** |
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73 | * Assert that an array contains a valid JSON API resource object collection. |
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74 | * |
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75 | * @param array $array |
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76 | * @param int $count |
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77 | * |
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78 | * @throws PHPUnit_Framework_AssertionFailedError |
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79 | */ |
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80 | View Code Duplication | public function assertJsonApiObjectCollection(array $array, $count = null) |
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90 | } |
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91 |
This check looks for methods that are used by a trait but not required by it.
To illustrate, let’s look at the following code example
The trait
Idable
provides a methodequalsId
that in turn relies on the methodgetId()
. If this method does not exist on a class mixing in this trait, the method will fail.Adding the
getId()
as an abstract method to the trait will make sure it is available.