Handle empty strings for ESPHome UOMs (#96556)

tests/components/esphome/test_number.py

@@ -15,7 +15,7 @@ from homeassistant.components.number import (
     DOMAIN as NUMBER_DOMAIN,
     SERVICE_SET_VALUE,
 )
-from homeassistant.const import ATTR_ENTITY_ID, STATE_UNKNOWN
+from homeassistant.const import ATTR_ENTITY_ID, ATTR_UNIT_OF_MEASUREMENT, STATE_UNKNOWN
 from homeassistant.core import HomeAssistant
 
 
@@ -89,3 +89,36 @@ async def test_generic_number_nan(
     state = hass.states.get("number.test_mynumber")
     assert state is not None
     assert state.state == STATE_UNKNOWN
+
+
+async def test_generic_number_with_unit_of_measurement_as_empty_string(
+    hass: HomeAssistant,
+    mock_client: APIClient,
+    mock_generic_device_entry,
+) -> None:
+    """Test a generic number entity with nan state."""
+    entity_info = [
+        NumberInfo(
+            object_id="mynumber",
+            key=1,
+            name="my number",
+            unique_id="my_number",
+            max_value=100,
+            min_value=0,
+            step=1,
+            unit_of_measurement="",
+            mode=ESPHomeNumberMode.SLIDER,
+        )
+    ]
+    states = [NumberState(key=1, state=42)]
+    user_service = []
+    await mock_generic_device_entry(
+        mock_client=mock_client,
+        entity_info=entity_info,
+        user_service=user_service,
+        states=states,
+    )
+    state = hass.states.get("number.test_mynumber")
+    assert state is not None
+    assert state.state == "42"
+    assert ATTR_UNIT_OF_MEASUREMENT not in state.attributes