Tests are not executed properly

[pnezis]

When executing mix test I am getting the following errors.

 Quantum.ExecutionBroadcasterTest: failure on setup_all callback, all tests have been invalidated
     ** (EXIT from #PID<0.422.0>) exited in: ExUnit.CaptureLog.remove_capture(#PID<0.490.0>)
         ** (EXIT) {:error, :module_not_found}

Quantum.ExecutorTest: failure on setup_all callback, all tests have been invalidated
     ** (EXIT from #PID<0.3948.0>) exited in: ExUnit.CaptureLog.remove_capture(#PID<0.3949.0>)
         ** (EXIT) {:error, :module_not_found}

The same errors appear in all latest coveralls pipelines. Notice that all remaining tests in the modules with issues are never executed and the tests appear as successful

The culprits are the following tests. If I comment them out all other tests run without issues:

- Quantum.ExecutionBroadcasterTest: "invalid timezone will not create a crash"
- Quantum.ExecutorTest: "start_link/3 logs error"
- Quantum.ExucutorTest: "start_link/3 releases lock on error"

[maennchen]

Hmm. There seems to be an elixir issue about it: https://github.com/elixir-lang/elixir/issues/8507

[pnezis]

This seems to be introduced by the addition of logger metadata #462.

Test output on the previous PR (#459):