test: add tests to set and clear the media description of an episode

program/tests/test_episodes.py

@@ -43,6 +43,7 @@ def user_with_episode_perms(request) -> User:
             "edit__episode__image",
             "edit__episode__contributors",
             "edit__episode__languages",
+            "edit__episode__media_description",
             "edit__episode__tags",
             "edit__episode__links",
         }
@@ -236,3 +237,20 @@ def test_episode_timeslot_ids_are_ordered_by_start_time(
     response = admin_api_client.get(url(episode))
     # timeslot ids must be in order of start time
     assert response.json()["timeslotIds"] == [first_ts.id, second_ts.id, third_ts.id]
+
+
+def test_episode_set_media_description(api_client_episode_perms, _owned_show):
+    episode = EpisodeFactory.create(show=_owned_show)
+    update = {"mediaDescription": "a media description"}
+
+    response = api_client_episode_perms.patch(url(episode=episode), data=update)
+
+    assert response.json()["mediaDescription"] == update["mediaDescription"]
+
+
+def test_episode_clear_media_description(api_client_episode_perms, _owned_show):
+    episode = EpisodeFactory.create(show=_owned_show)
+
+    response = api_client_episode_perms.patch(url(episode=episode), data={"mediaDescription": ""})
+
+    assert response.json()["mediaDescription"] == ""