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:
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19 | View Code Duplication | class AbstractArticleOverviewPageTest extends TestCase |
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21 | public function testGettersAndSetters() |
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Having each class in a dedicated file usually plays nice with PSR autoloaders and is therefore a well established practice. If you use other autoloaders, you might not want to follow this rule.