Use TestCase.addCleanup (#36560)

tests/components/command_line/test_switch.py

@@ -20,10 +20,7 @@ class TestCommandSwitch(unittest.TestCase):
     def setUp(self):
         """Set up things to be run when tests are started."""
         self.hass = get_test_home_assistant()
-
-    def tearDown(self):
-        """Stop everything that was started."""
-        self.hass.stop()
+        self.addCleanup(self.hass.stop)
 
     def test_state_none(self):
         """Test with none state."""