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 EcommercePaymentResponseTest extends \PHPUnit_Framework_TestCase |
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20 | { |
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21 | /** @test */ |
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22 | public function CanBeVerified() |
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29 | |||
30 | /** @test */ |
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31 | public function CanBeConvertedToArray() |
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43 | |||
44 | |||
45 | /** |
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46 | * @test |
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47 | * @expectedException InvalidArgumentException |
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48 | */ |
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49 | public function CannotExistWithoutShaSign() |
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53 | |||
54 | /** @test */ |
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55 | View Code Duplication | public function ParametersCanBeRetrieved() |
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62 | |||
63 | /** |
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64 | * @test |
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65 | * @expectedException InvalidArgumentException |
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66 | */ |
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67 | public function RequestIsFilteredFromNonOgoneParameters() |
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74 | |||
75 | /** @test */ |
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76 | public function ChecksStatus() |
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83 | |||
84 | /** @test */ |
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85 | public function AmountIsConvertedToCent() |
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92 | |||
93 | public function provideFloats() |
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102 | |||
103 | /** |
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104 | * @test |
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105 | * @expectedException InvalidArgumentException |
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106 | */ |
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107 | public function InvalidForInvalidCurrency() |
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112 | |||
113 | /** |
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114 | * @test |
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115 | * @dataProvider provideFloats |
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116 | */ |
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117 | public function CorrectlyConvertsFloatAmountsToInteger($string, $integer) |
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122 | |||
123 | /** |
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124 | * Helper method to setup a request array |
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125 | */ |
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126 | private function provideRequest() |
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136 | } |
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137 |
This check looks for variable assignements that are either overwritten by other assignments or where the variable is not used subsequently.
Both the
$myVar
assignment in line 1 and the$higher
assignment in line 2 are dead. The first because$myVar
is never used and the second because$higher
is always overwritten for every possible time line.