Add tests

homeassistant/components/mqtt/client.py

@@ -387,6 +387,7 @@ class MQTT:
         self.loop = hass.loop
         self.config_entry = config_entry
         self.conf = conf
+        self.is_mqttv5 = conf.get(CONF_PROTOCOL, DEFAULT_PROTOCOL) == PROTOCOL_5
 
         self._simple_subscriptions: defaultdict[str, set[Subscription]] = defaultdict(
             set
@@ -686,9 +687,7 @@ class MQTT:
                     # subscriptions) is cleared on successful connect when the
                     # clean_start flag is set. For MQTT v3.1.1, the clean_session
                     # argument of Client should be used for similar result.
-                    True
-                    if self._mqttc.protocol == mqtt.MQTTv5
-                    else mqtt.MQTT_CLEAN_START_FIRST_ONLY,  # clean_start
+                    True if self.is_mqttv5 else mqtt.MQTT_CLEAN_START_FIRST_ONLY,
                 )
         except (OSError, mqtt.WebsocketConnectionError) as err:
             _LOGGER.error("Failed to connect to MQTT server due to exception: %s", err)

tests/components/mqtt/test_client.py

@@ -1330,7 +1330,7 @@ async def test_handle_message_callback(
 
 
 @pytest.mark.parametrize(
-    ("mqtt_config_entry_data", "protocol"),
+    ("mqtt_config_entry_data", "protocol", "clean_session"),
     [
         (
             {
@@ -1338,6 +1338,7 @@ async def test_handle_message_callback(
                 CONF_PROTOCOL: "3.1",
             },
             3,
+            True,
         ),
         (
             {
@@ -1345,6 +1346,7 @@ async def test_handle_message_callback(
                 CONF_PROTOCOL: "3.1.1",
             },
             4,
+            True,
         ),
         (
             {
@@ -1352,22 +1354,72 @@ async def test_handle_message_callback(
                 CONF_PROTOCOL: "5",
             },
             5,
+            None,
         ),
     ],
+    ids=["v3.1", "v3.1.1", "v5"],
 )
-async def test_setup_mqtt_client_protocol(
-    mqtt_mock_entry: MqttMockHAClientGenerator, protocol: int
+async def test_setup_mqtt_client_clean_session_and_protocol(
+    hass: HomeAssistant,
+    mqtt_mock_entry: MqttMockHAClientGenerator,
+    mqtt_client_mock: MqttMockPahoClient,
+    protocol: int,
+    clean_session: bool | None,
 ) -> None:
-    """Test MQTT client protocol setup."""
+    """Test MQTT client clean_session and protocol setup."""
     with patch(
         "homeassistant.components.mqtt.async_client.AsyncMQTTClient"
     ) as mock_client:
         await mqtt_mock_entry()
 
+    # check if clean_session was correctly
+    assert mock_client.call_args[1]["clean_session"] == clean_session
+
     # check if protocol setup was correctly
     assert mock_client.call_args[1]["protocol"] == protocol
 
 
+@pytest.mark.parametrize(
+    ("mqtt_config_entry_data", "connect_args"),
+    [
+        (
+            {
+                mqtt.CONF_BROKER: "mock-broker",
+                CONF_PROTOCOL: "3.1",
+            },
+            call("mock-broker", 1883, 60, "", 0, 3),
+        ),
+        (
+            {
+                mqtt.CONF_BROKER: "mock-broker",
+                CONF_PROTOCOL: "3.1.1",
+            },
+            call("mock-broker", 1883, 60, "", 0, 3),
+        ),
+        (
+            {
+                mqtt.CONF_BROKER: "mock-broker",
+                CONF_PROTOCOL: "5",
+            },
+            call("mock-broker", 1883, 60, "", 0, True),
+        ),
+    ],
+    ids=["v3.1", "v3.1.1", "v5"],
+)
+async def test_setup_mqtt_client_clean_start(
+    hass: HomeAssistant,
+    mqtt_mock_entry: MqttMockHAClientGenerator,
+    mqtt_client_mock: MqttMockPahoClient,
+    connect_args: tuple[Any],
+) -> None:
+    """Test MQTT client protocol connects with `clean_start` set correctly."""
+    await mqtt_mock_entry()
+
+    # check if clean_start was set correctly
+    assert len(mqtt_client_mock.connect.mock_calls) == 1
+    assert mqtt_client_mock.connect.mock_calls[0] == connect_args
+
+
 @patch("homeassistant.components.mqtt.client.TIMEOUT_ACK", 0.2)
 async def test_handle_mqtt_timeout_on_callback(
     hass: HomeAssistant, caplog: pytest.LogCaptureFixture, mock_debouncer: asyncio.Event