Add dynamic icon for lightbulb group (#176218)

homeassistant/components/group/icons.json

@@ -1,4 +1,14 @@
 {
+  "entity": {
+    "light": {
+      "light": {
+        "default": "mdi:lightbulb-group",
+        "state": {
+          "off": "mdi:lightbulb-group-off"
+        }
+      }
+    }
+  },
   "services": {
     "reload": {
       "service": "mdi:reload"

homeassistant/components/group/light.py

@@ -147,7 +147,7 @@ class LightGroup(GroupEntity, LightEntity):
     """Representation of a light group."""
 
     _attr_available = False
-    _attr_icon = "mdi:lightbulb-group"
+    _attr_translation_key = "light"
     _attr_max_color_temp_kelvin = 6500
     _attr_min_color_temp_kelvin = 2000
     _attr_should_poll = False

tests/components/group/test_config_flow.py

@@ -475,7 +475,6 @@ EVENT_ATTRS = [{"event_types": []}, {"event_type": None}]
 FAN_ATTRS = [{"supported_features": 0}, {}]
 LIGHT_ATTRS = [
     {
-        "icon": "mdi:lightbulb-group",
         "supported_color_modes": ["onoff"],
         "supported_features": 0,
     },