[android-developers] adb shell am start -W hangs

For automated testing purposes I am trying to launch my app via the command line, and have it not return until the app is finished.  I am using this shell command:

adb shell am start -W -S -n com.whatever.my_app/.RunAllTests;

The problem is this works sometimes, and when it doesn't, it hangs and never returns.  In LogCat, and on the device or emulator, I see my app launch, run tests, and quit, but I am still stuck in the shell command.  Any ideas why this fails to return?

Regards, Guy

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