Flaky test: "port test dart fail async"

[mkorbel1]

Describe the bug

The test "port test dart fail async" is flakey and fails occasionally.

To Reproduce

Run the test and/or all tests in the file. Unsure what causes the flakiness and if there is a real issue or not.

Expected behavior

pass

Actual behavior

  TimeoutException after 0:00:30.000000: Test timed out after 30 seconds. See https://pub.dev/packages/test#timeouts
  dart:isolate  _RawReceivePort._handleMessage

Additional: Dart SDK info

No response

Additional: pubspec.yaml

No response

Additional: Context

No response