When Unity is instructed to run Play mode tests, the full path to the results file must be given. If this not given, then Unity will hang indefinitely.

Steps:
1. Create a New Project, save it, exit Unity
2. Open attached file ("RunTests.bat") and edit it:
a) change Unity.exe location
b) change projectPath location
3. Run batch file
4. Click any number on keyboard

Expected results: batch operation finishes, results appear on .xml file
Actual results: Unity hangs.

Workaround: give a full path to -testResults.

Reproduced with: 2017.3.0b3, 2017.2.0f2, 2017.1.2p1, 5.6.4p1.