test(sdk): Add test for maybe_apply_new_redaction

[Hywan]

Follow up of #4740. I forgot to add a test!

This patch adds a test for maybe_apply_new_redaction when the redacted event is not loaded in-memory, i.e. when it lives in the store only.

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• Address [meta] EventCache storage #3280

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.29%. Comparing base (1d7c60c) to head (208e6ed).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4760      +/-   ##
==========================================
+ Coverage   86.28%   86.29%   +0.01%     
==========================================
  Files         290      290              
  Lines       34281    34281              
==========================================
+ Hits        29578    29583       +5     
+ Misses       4703     4698       -5     

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[poljar]

Thanks for adding the forgotten test. I left a small suggestion but feel free to ignore.

[poljar]

Suggested change

	AnySyncTimelineEvent::MessageLike(AnySyncMessageLikeEvent::RoomMessage(event)) => {
	// The event has been redacted!
	assert!(event.as_original().is_none());
	AnySyncTimelineEvent::MessageLike(event) => {
	// The event has been redacted!
	assert!(event.is_redacted());

Not quite the same, but if we only care about the fact that the event is redacted might be nicer to read.