Issue #2850635: Move AttributeTest class tests from Common to Template

Kieran Cottrequested to merge
issue/drupal-2850635:2850635-merge-common-template-attributetest into main
  • Moved the data provider and three tests into core/tests/Drupal/Tests/Core/Template/AttributeTest.php:28.
  • Deleted Core/Common/AttributesTest.php.
  • PHP syntax, targeted PHPCS, and git diff --check passed.

Closes #2850635

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