add a crashing test for mainActorNow

[ecito]

No description provided.

[stephencelis]

@ecito Without more context we're not sure what to do with this PR. The test seems to be invoking the internal mainActorNow API directly, which can for sure cause an issue when invoked on the main thread on a non-main queue. We've since reduced the number of calls to mainActorNow on main, so if you were experiencing an issue related to that, can you confirm if it was fixed or not? If not, can you provide a test that fails from how TCA uses mainActorNow rather than a test that invokes it directly?

[stephencelis]

Going to close this PR since I'm not sure it's actionable, but feel to follow up with a comment or another PR. Thanks!

[ecito]

ah sorry, missed this question. very OK to close the PR, it was just to show code for discussion.

I can confirm these changes fixes the issue for us