fix: handle empty last_message_received

custom_components/weenect/sensor.py

@@ -145,6 +145,7 @@ def native_value(self) -> StateType:
                     self.entity_description.key
                 ]
                 if self.device_class == str(SensorDeviceClass.TIMESTAMP):
-                    return dt.parse_datetime(value)
+                    if value:
+                        return dt.parse_datetime(value)
                 return value
         return None

tests/conftest.py

@@ -69,3 +69,15 @@ def get_trackers_last_freq_mode_none_fixture():
         side_effect=AsyncMock(return_value=response),
     ):
         yield
+
+
+@pytest.fixture(name="get_trackers_last_message_none")
+def get_trackers_last_message_none_fixture():
+    """Static result when retrieving data from weenect."""
+    response = copy.deepcopy(GET_RACKERS_RESPONSE)
+    response["items"][0]["position"][0]["last_message"] = None
+    with patch(
+        "aioweenect.AioWeenect.get_trackers",
+        side_effect=AsyncMock(return_value=response),
+    ):
+        yield

tests/test_sensor.py

@@ -45,7 +45,7 @@ async def test_sensor(hass):
 
 
 @pytest.mark.usefixtures("get_trackers")
-async def test_device_class_does_not_return_strin_for_its_state(hass, caplog):
+async def test_device_class_does_not_return_string_for_its_state(hass, caplog):
     """Test that sensor works."""
     config_entry = MockConfigEntry(domain=DOMAIN, data=MOCK_CONFIG, entry_id="test")
     config_entry.add_to_hass(hass)
@@ -58,3 +58,16 @@ async def test_device_class_does_not_return_strin_for_its_state(hass, caplog):
         "is providing a string for its state, while the device class is"
         not in caplog.text
     )
+
+
+@pytest.mark.usefixtures("get_trackers_last_message_none")
+async def test_sensor_with_last_message_none(hass):
+    """Test that the special timestamp sensor works for a None value ."""
+    config_entry = MockConfigEntry(domain=DOMAIN, data=MOCK_CONFIG, entry_id="test")
+    config_entry.add_to_hass(hass)
+
+    await hass.config_entries.async_setup(config_entry.entry_id)
+
+    await hass.async_block_till_done()
+
+    assert hass.states.get("sensor.test_last_message_received").state == "unknown"