Alexa: Set Equalizer property to retrievable (#50730)

homeassistant/components/alexa/capabilities.py

@@ -1920,6 +1920,10 @@ class AlexaEqualizerController(AlexaCapability):
         """
         return [{"name": "mode"}]
 
+    def properties_retrievable(self):
+        """Return True if properties can be retrieved."""
+        return True
+
     def get_property(self, name):
         """Read and return a property."""
         if name != "mode":

tests/components/alexa/test_smart_home.py

@@ -3264,6 +3264,7 @@ async def test_media_player_eq_modes(hass):
 
     eq_capability = get_capability(capabilities, "Alexa.EqualizerController")
     assert eq_capability is not None
+    assert eq_capability["properties"]["retrievable"]
     assert "modes" in eq_capability["configurations"]
 
     eq_modes = eq_capability["configurations"]["modes"]