def test_invalid_signal(self):
        """
        Test sending a signal that no one is connected to.

        @raise AssertionError: If the test fails.
        """
        mediator = Mediator()

        try:
            mediator.signal('foo')
        except:
            raise AssertionError()

        Test sending a signal that no one is connected to.

        @raise AssertionError: If the test fails.
        
tests/behavioral_tests/test_mediator.py