Fix wrong exposed light for emulated hue (#25581)

* Add auto detect if brightness is supported

* Fix

* Fix tests

* Cleanup

homeassistant/components/emulated_hue/hue_api.py

@@ -517,6 +517,8 @@ def get_entity_state(config, entity):
 
 def entity_to_json(config, entity, state):
     """Convert an entity to its Hue bridge JSON representation."""
+    entity_features = entity.attributes.get(ATTR_SUPPORTED_FEATURES, 0)
+    if entity_features & SUPPORT_BRIGHTNESS:
         return {
             'state':
             {
@@ -532,6 +534,18 @@ def entity_to_json(config, entity, state):
             'uniqueid': entity.entity_id,
             'swversion': '123'
             }
+    return {
+        'state':
+        {
+            HUE_API_STATE_ON: state[STATE_ON],
+            'reachable': True
+        },
+        'type': 'On/off light',
+        'name': config.get_entity_name(entity),
+        'modelid': 'HASS123',
+        'uniqueid': entity.entity_id,
+        'swversion': '123'
+        }
 
 
 def create_hue_success_response(entity_id, attr, value):

tests/components/emulated_hue/test_hue_api.py

@@ -121,6 +121,10 @@ def hass_hue(loop, hass):
         kitchen_light_entity.entity_id, kitchen_light_entity.state,
         attributes=attrs)
 
+    # create a lamp without brightness support
+    hass.states.async_set(
+        'light.no_brightness', 'on', {})
+
     # Ceiling Fan is explicitly excluded from being exposed
     ceiling_fan_entity = hass.states.get('fan.ceiling_fan')
     attrs = dict(ceiling_fan_entity.attributes)
@@ -219,6 +223,15 @@ def test_discover_lights(hue_client):
     assert 'climate.ecobee' not in devices
 
 
+@asyncio.coroutine
+def test_light_without_brightness_supported(hass_hue, hue_client):
+    light_without_brightness_json = yield from perform_get_light_state(
+        hue_client, 'light.no_brightness', 200)
+
+    assert light_without_brightness_json['state'][HUE_API_STATE_ON] is True
+    assert light_without_brightness_json['type'] == 'On/off light'
+
+
 @asyncio.coroutine
 def test_get_light_state(hass_hue, hue_client):
     """Test the getting of light state."""