Add test support to record async events, with JUnit Jupiter caveat #30020
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This commit modifies the way the
@RecordApplicationEventsannotationworks in tests, allowing for capture of events from threads other than
the main test thread (async events) and for the assertion of captured
event from a separate thread (e.g. when using
Awaitility).This is done by switching the
ApplicationEventsHolderto use anInheritedThreadLocal.There is a mutual exclusion between support of asynchronous events vs
support of JUnit5 parallel tests with the
@TestInstance(PER_CLASS)mode. As a result, we favor the former and now
SpringExtensionwillinvalidate a test class that is annotated (or meta-annotated, or
enclosed-annotated) with
@RecordApplicationEventsAND@TestInstance(PER_CLASS)AND@Execution(CONCURRENT).Closes gh-29827