This testcase will

1) Verify the handleQuitRequestWith() method of QuitHandler interface.
2) Check that the response is passed to the handler by means of quit notification generated by a key combination of META+Q (Mac) or ALT+F4(Windows & Linux).
3) Confirm that the active window is closed.

Testing:
Tested using Mach5(20 times per platform) in Mac OS, Linux and Windows and got all pass.