Add test_async_update_forecast_fail

tests/test_binary_sensor.py

@@ -31,7 +31,7 @@
     CONF_PLATFORM,
     UnitOfTemperature,
 )
-from homeassistant.core import HomeAssistant, State
+from homeassistant.core import HomeAssistant, State, SupportsResponse
 from homeassistant.exceptions import HomeAssistantError
 from homeassistant.util import dt as dt_util
 
@@ -184,3 +184,35 @@ async def test_async_update(hass: HomeAssistant, default_sensor):
     assert default_sensor.available
     assert default_sensor.is_on is False
     assert default_sensor.icon == ICON_SUMMER
+
+
+async def test_async_update_forecast_fail(hass: HomeAssistant, default_sensor):
+    """Test sensor update on forecast fail."""
+    hass.states._states[MOCK_WEATHER_ENTITY] = State(MOCK_WEATHER_ENTITY, None)
+
+    with raises(HomeAssistantError):
+        await default_sensor.async_update()
+
+    hass.states.async_set(MOCK_WEATHER_ENTITY, "State")
+
+    with raises(HomeAssistantError):
+        await default_sensor.async_update()
+
+    async_mock_service(
+        hass,
+        CONF_WEATHER,
+        SERVICE_GET_FORECASTS,
+        supports_response=SupportsResponse.OPTIONAL,
+    )
+
+    hass.states.async_set(
+        MOCK_WEATHER_ENTITY,
+        "State",
+        attributes={
+            ATTR_WEATHER_TEMPERATURE: -1,
+            ATTR_SUPPORTED_FEATURES: WeatherEntityFeature.FORECAST_DAILY,
+        },
+    )
+
+    with raises(HomeAssistantError):
+        await default_sensor.async_update()