Fix strict type errors in kernel tests: Add casts and fix types where needed

Expanded to include a few int and bool casts, there were not many.

Decided to exclude \Drupal\KernelTests\AssertContentTrait as I think it should have its own issue.

Have adjusted this to include incorrect type declarations and hard coded values (e.g. FALSE instead of 0).

44 files is a lot but was easy to read. Tests are all green but guess we will know quickly when strict gets added to all kernel tests.

Opened one other informational thread, but agreed this is ready.

Crediting mstrelan for the effort, smustgrave and myself for reviews.

Thanks!
-Derek

I'm triaging RTBC issues → . I read the IS, the comments and reviewed the MR. I didn't find any unanswered questions, and all my questions were already answered.

Leaving at RTBC.

Committed to 11.x and backported to 10.2.x for consistency with other test strict-typing changes

larowlan → closed merge request !5470

Automatically closed - issue fixed for 2 weeks with no activity.