Fix a bug in build_test where the resolve* apis would leak unhandled async errors #2599
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Fixes #2596
Specifically if the
action
callback throws any exceptions then we would leak those as unhandled async errors.We can't await the call to
runBuilder
because that would block on thetearDown
future which would hang tests.The solution is to just swallow all errors from the unawaited future, and rely on the
onDone
Future to report most errors. We try/catch the action callback and forward the errors to theonDone
completer.