def test_greeter_hides_on_app_open(self):
        """Greeter should hide when an app is opened"""
        process_helpers.lock_unity()

        def unlock_thread_worker(greeter):
            greeter.wait_swiped_away()
            process_helpers.unlock_unity()
            greeter.created.wait_for(False)

        greeter = self.main_window.get_greeter()
        unlock_thread = threading.Thread(target=unlock_thread_worker, args=(greeter,))
        unlock_thread.start()
        application_name = self.launch_fake_app()
        unlock_thread.join(10)
        
        self.assert_current_focused_application(application_name)