Improve error logging in trend binary sensor (#146358)

homeassistant/components/trend/binary_sensor.py

@@ -239,7 +239,14 @@ class SensorTrend(BinarySensorEntity, RestoreEntity):
 
                 self.async_schedule_update_ha_state(True)
             except (ValueError, TypeError) as ex:
-                _LOGGER.error(ex)
+                _LOGGER.error(
+                    "Error processing sensor state change for "
+                    "entity_id=%s, attribute=%s, state=%s: %s",
+                    self._entity_id,
+                    self._attribute,
+                    new_state.state,
+                    ex,
+                )
 
         self.async_on_remove(
             async_track_state_change_event(

tests/components/trend/test_binary_sensor.py

@@ -437,3 +437,50 @@ async def test_unavailable_source(
     await hass.async_block_till_done()
 
     assert hass.states.get("binary_sensor.test_trend_sensor").state == "on"
+
+
+async def test_invalid_state_handling(
+    hass: HomeAssistant,
+    config_entry: MockConfigEntry,
+    setup_component: ComponentSetup,
+    freezer: FrozenDateTimeFactory,
+    caplog: pytest.LogCaptureFixture,
+) -> None:
+    """Test handling of invalid states in trend sensor."""
+    await setup_component(
+        {
+            "sample_duration": 10000,
+            "min_gradient": 1,
+            "max_samples": 25,
+            "min_samples": 5,
+        },
+    )
+
+    for val in (10, 20, 30, 40, 50, 60):
+        freezer.tick(timedelta(seconds=2))
+        hass.states.async_set("sensor.test_state", val)
+        await hass.async_block_till_done()
+
+    assert hass.states.get("binary_sensor.test_trend_sensor").state == STATE_ON
+
+    # Set an invalid state
+    hass.states.async_set("sensor.test_state", "invalid")
+    await hass.async_block_till_done()
+
+    # The trend sensor should handle the invalid state gracefully
+    assert (sensor_state := hass.states.get("binary_sensor.test_trend_sensor"))
+    assert sensor_state.state == STATE_ON
+
+    # Check if a warning is logged
+    assert (
+        "Error processing sensor state change for entity_id=sensor.test_state, "
+        "attribute=None, state=invalid: could not convert string to float: 'invalid'"
+    ) in caplog.text
+
+    # Set a valid state again
+    hass.states.async_set("sensor.test_state", 50)
+    await hass.async_block_till_done()
+
+    # The trend sensor should return to a valid state
+    assert (sensor_state := hass.states.get("binary_sensor.test_trend_sensor"))
+    assert sensor_state.state == "on"