Fix fan not checking supported_features (#35248)

* Fix fan not checking supported_features

* Fix pylint

* Fix test

* Code cleanup

* Fix fan demo

* Code style improvement

homeassistant/components/demo/fan.py

@@ -37,12 +37,12 @@ class DemoFan(FanEntity):
         self.hass = hass
         self._supported_features = supported_features
         self._speed = STATE_OFF
-        self.oscillating = None
+        self._oscillating = None
         self._direction = None
         self._name = name
 
         if supported_features & SUPPORT_OSCILLATE:
-            self.oscillating = False
+            self._oscillating = False
         if supported_features & SUPPORT_DIRECTION:
             self._direction = "forward"
 
@@ -89,7 +89,7 @@ class DemoFan(FanEntity):
 
     def oscillate(self, oscillating: bool) -> None:
         """Set oscillation."""
-        self.oscillating = oscillating
+        self._oscillating = oscillating
         self.schedule_update_ha_state()
 
     @property
@@ -97,6 +97,11 @@ class DemoFan(FanEntity):
         """Fan direction."""
         return self._direction
 
+    @property
+    def oscillating(self) -> bool:
+        """Oscillating."""
+        return self._oscillating
+
     @property
     def supported_features(self) -> int:
         """Flag supported features."""

homeassistant/components/fan/__init__.py

@@ -45,12 +45,6 @@ ATTR_SPEED_LIST = "speed_list"
 ATTR_OSCILLATING = "oscillating"
 ATTR_DIRECTION = "direction"
 
-PROP_TO_ATTR = {
-    "speed": ATTR_SPEED,
-    "oscillating": ATTR_OSCILLATING,
-    "current_direction": ATTR_DIRECTION,
-}
-
 
 @bind_hass
 def is_on(hass, entity_id: str) -> bool:
@@ -166,23 +160,32 @@ class FanEntity(ToggleEntity):
         """Return the current direction of the fan."""
         return None
 
+    @property
+    def oscillating(self):
+        """Return whether or not the fan is currently oscillating."""
+        return None
+
     @property
     def capability_attributes(self):
         """Return capability attributes."""
-        return {ATTR_SPEED_LIST: self.speed_list}
+        if self.supported_features & SUPPORT_SET_SPEED:
+            return {ATTR_SPEED_LIST: self.speed_list}
+        return {}
 
     @property
     def state_attributes(self) -> dict:
         """Return optional state attributes."""
         data = {}
+        supported_features = self.supported_features
 
-        for prop, attr in PROP_TO_ATTR.items():
-            if not hasattr(self, prop):
-                continue
+        if supported_features & SUPPORT_DIRECTION:
+            data[ATTR_DIRECTION] = self.current_direction
 
-            value = getattr(self, prop)
-            if value is not None:
-                data[attr] = value
+        if supported_features & SUPPORT_OSCILLATE:
+            data[ATTR_OSCILLATING] = self.oscillating
+
+        if supported_features & SUPPORT_SET_SPEED:
+            data[ATTR_SPEED] = self.speed
 
         return data
 

tests/components/fan/test_init.py

@@ -31,7 +31,7 @@ class TestFanEntity(unittest.TestCase):
         assert self.fan.state == "off"
         assert len(self.fan.speed_list) == 0
         assert self.fan.supported_features == 0
-        assert {"speed_list": []} == self.fan.capability_attributes
+        assert self.fan.capability_attributes == {}
         # Test set_speed not required
         self.fan.oscillate(True)
         with pytest.raises(NotImplementedError):