Problem/Motivation
This is a subissue of #2526060: Add tests for action plugins. We need automated tests for the Comment action plugins. Those plugins can be found in core/modules/comment/src/Plugin/Action
Proposed resolution
Add tests.
Remaining tasks
- The test class contains one test, testing all the comment action plugins. It should have a test per plugin.
- The test class is called CommentActionsUnitTests, but I think these are not unit tests, but kernel tests.