b2f8d3a668
Flutter widget tests assert if a test completes with timers still pending. However, it can be hard to diagnose where a pending timer came from. For example, a widget might consume a third-party library that internally uses a timer. I added a FakeAsync.pendingTimersDebugInfo getter to quiver (https://github.com/google/quiver-dart/pull/500). Make flutter_test use it. Additionally modify Flutter's debugPrintStack to take an optional StackTrace argument instead of always printing StackTrace.current. Fixes #4237.
This is a fake package for use by automated testing.
For example, the flutter_tools package uses this to test flutter test.