def testResetButton(self): Keyboard.initKeyboard = MagicMock(0) keyboard = Keyboard() keyboard.mapping_notes = [1, 2] keyboard.customMapping = {1:2} keyboard.resetButton() self.assertEqual(keyboard.mapping_notes, []) self.assertNotEqual(keyboard.customMapping, {}) keyboard.resetButton() self.assertEqual(keyboard.mapping_notes, []) self.assertEqual(keyboard.customMapping, {})