To reproduce:
1. Open Terminal window
2. Download user's project and unzip it
3. Launch Test Runner by using this command:
/(path to the folder with Unity's installation)/Unity.app/Contents/MacOS/Unity -projectPath (path to the folder with user's project) -batchmode -runTests -testPlatform editmode -logFile (enter path where log file should be saved)

Expected result: After running a test Unity should close itself (terminate).
Actual result: Unity freezes and you have to Force Quit it.

Reproduced with: 5.6.3p4, 2017.1.2p1, 2017.2.0f3, 2017.3.0b4, 2018.1.0a1
Not reproducible with: 5.5.5p1

Won't fix because we don't support static test methods.