Correct device_class test for mqtt button (#101500)

tests/components/mqtt/test_button.py

@@ -443,7 +443,7 @@ async def test_entity_debug_info_message(
             mqtt.DOMAIN: {
                 button.DOMAIN: {
                     "name": "test",
-                    "state_topic": "test-topic",
+                    "command_topic": "test-topic",
                     "device_class": "foobarnotreal",
                 }
             }
@@ -451,11 +451,14 @@ async def test_entity_debug_info_message(
     ],
 )
 async def test_invalid_device_class(
-    hass: HomeAssistant, mqtt_mock_entry: MqttMockHAClientGenerator
+    hass: HomeAssistant,
+    mqtt_mock_entry: MqttMockHAClientGenerator,
+    caplog: pytest.LogCaptureFixture,
 ) -> None:
     """Test device_class option with invalid value."""
     with pytest.raises(AssertionError):
         await mqtt_mock_entry()
+    assert "expected ButtonDeviceClass" in caplog.text
 
 
 @pytest.mark.parametrize(