- Replace tabs with spaces in test files
- Use require_once instead of require
- Add @return void to docblocks
- Define constants for repeated string literals
- Use WordPress spacing conventions
- Add use statements for cleaner class references
- Add guards to WP_Mock tests to skip when WP_UnitTestCase is available
- Add guards to WordPress unit tests to skip when WP_UnitTestCase is not available
- Add @group annotations for test separation
