Use the `PHPUnit\Framework\TestCase` notation instead of `PHPUnit_Framework_TestCase` while extending our TestCases. This will help us migrate to PHPUnit 6, that [no longer support snake case class names](https://github.com/sebastianbergmann/phpunit/blob/master/ChangeLog-6.0.md#changed-1). |
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| .. | ||
| Calculation | ||
| Cell | ||
| Chart | ||
| Collection | ||
| Custom | ||
| Helper | ||
| Reader | ||
| Shared | ||
| Style | ||
| Worksheet | ||
| Writer | ||
| IOFactoryTest.php | ||
| ReferenceHelperTest.php | ||
| SettingsTest.php | ||