[tests] Fix flaky standalone/io/http_auth_digest_test

This test has a few independent calls to asyncExpectThrows which uses
asyncStart/asyncEnd. However, multiple top-level asyncStart/asyncEnd
are not allowed, which causes the following flaky error:

```
Unhandled exception:
Exception: Fatal: asyncStart() was called even though we are done with testing.. This is most likely a bug in your test.
#0      asyncStart (package:expect/async_helper.dart:53)
#1      asyncExpectThrows (package:expect/async_helper.dart:140)
#2      testMalformedAuthenticateHeaderWithAuthHandler.<anonymous closure> (file:///b/s/w/ir/cache/builder/sdk/tests/standalone/io/http_auth_digest_test.dart:345)
#3      Future._propagateToListeners.handleValueCallback (dart:async/future_impl.dart:951)
#4      Future._propagateToListeners (dart:async/future_impl.dart:980)
#5      Future._completeWithValue (dart:async/future_impl.dart:723)
#6      Future._asyncCompleteWithValue.<anonymous closure> (dart:async/future_impl.dart:807)
#7      _microtaskLoop (dart:async/schedule_microtask.dart:40)
#8      _startMicrotaskLoop (dart:async/schedule_microtask.dart:49)
#9      _runPendingImmediateCallback (dart:isolate-patch/isolate_patch.dart:128)
#10     _RawReceivePort._handleMessage (dart:isolate-patch/isolate_patch.dart:195)

--- Re-run this test:
python3 tools/test.py -n vm-aot-ubsan-linux-release-x64 standalone/io/http_auth_digest_test
```

This change attempts to fix this by adding a top-level asyncStart/asyncEnd
and also asyncStart/asyncEnd to the server start/shutdown to
enclose each test case into asyncStart/asyncEnd and avoid printing
"unittest-suite-success" marker before all test cases are finished.

TEST=standalone/io/http_auth_digest_test

Change-Id: I950e7c6c09f5c2144da874ab3be3cd3a130d3790
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/411086
Commit-Queue: Alexander Markov <alexmarkov@google.com>
Reviewed-by: Alexander Aprelev <aam@google.com>
1 file changed
tree: 0fbada77b9857ffdbafee9c732e9458d75675ddd
  1. .dart_tool/
  2. .github/
  3. benchmarks/
  4. build/
  5. docs/
  6. pkg/
  7. runtime/
  8. samples/
  9. sdk/
  10. tests/
  11. third_party/
  12. tools/
  13. utils/
  14. .clang-format
  15. .gitattributes
  16. .gitconfig
  17. .gitignore
  18. .gn
  19. .mailmap
  20. .style.yapf
  21. AUTHORS
  22. BUILD.gn
  23. CHANGELOG.md
  24. codereview.settings
  25. CONTRIBUTING.md
  26. DEPS
  27. LICENSE
  28. OWNERS
  29. PATENT_GRANT
  30. PRESUBMIT.py
  31. README.dart-sdk
  32. README.md
  33. sdk.code-workspace
  34. sdk_args.gni
  35. sdk_packages.yaml
  36. SECURITY.md
  37. WATCHLISTS
README.md

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