Steps to reproduce:
1. run tests on attached project from command line with batchmode turned on
[path-to-unity]/Unity.exe -runTests -projectpath [path-to-project]\BatchmodeRepro\ -testPlatform playmode -testResults [path-to-save-results]\testresults.xml -batchmode

Actual: the test result shows a timing out test
Expected results: there is one passing test

Reproduced on: 2018.3.0a6

The project contains following test which should always pass:

[UnityTest]
public IEnumerator WaitForEndOfFrame_DoesNotTimeout()
{
yield return new WaitForEndOfFrame();
}

Although if called in batchmode it never returns and ends up timing out.