Update and add missing tests.

Author: mplatypus

tests/hikari/impl/test_entity_factory.py

@@ -5724,26 +5724,30 @@ def test__deserialize_media_with_unset_fields(self, entity_factory_impl, media_p
         del media_payload["width"]
         del media_payload["height"]
         del media_payload["content_type"]
+        del media_payload["loading_state"]
 
         media = entity_factory_impl._deserialize_media(media_payload)
 
         assert media.proxy_url is None
         assert media.width is undefined.UNDEFINED
         assert media.height is undefined.UNDEFINED
         assert media.content_type is undefined.UNDEFINED
+        assert media.loading_state is undefined.UNDEFINED
 
         assert isinstance(media, component_models.MediaResource)
 
     def test__deserialize_media_with_nullable_fields(self, entity_factory_impl, media_payload):
         media_payload["width"] = None
         media_payload["height"] = None
         media_payload["content_type"] = None
+        media_payload["loading_state"] = None
 
         media = entity_factory_impl._deserialize_media(media_payload)
 
         assert media.width is None
         assert media.height is None
         assert media.content_type is None
+        assert media.loading_state is None
 
         assert isinstance(media, component_models.MediaResource)