Only allow MusicBrainz tagged file on a pod (#2083)

Part-of: <https://dev.funkwhale.audio/funkwhale/funkwhale/-/merge_requests/2607>

api/tests/music/test_tasks.py

@@ -1400,3 +1400,30 @@ def test_fs_import(factories, cache, mocker, settings):
     }
     assert cache.get("fs-import:status") == "finished"
     assert "Pruning dangling tracks" in cache.get("fs-import:logs")[-1]
+
+
+def test_upload_checks_mbid_tag(temp_signal, factories, mocker):
+    mocker.patch("funkwhale_api.federation.routes.outbox.dispatch")
+    mocker.patch("funkwhale_api.music.tasks.populate_album_cover")
+    mocker.patch("funkwhale_api.music.metadata.Metadata.get_picture")
+    # mocker.spy(tasks, "get_track_from_import_metadata")
+    track = factories["music.Track"](album__attachment_cover=None, mbid=None)
+    path = os.path.join(DATA_DIR, "with_cover.opus")
+
+    upload = factories["music.Upload"](
+        track=None,
+        audio_file__from_path=path,
+        import_metadata={"funkwhale": {"track": {"uuid": str(track.uuid)}}},
+    )
+    mocker.patch("funkwhale_api.music.models.TrackActor.create_entries")
+
+    with temp_signal(signals.upload_import_status_updated) as handler:
+        tasks.process_upload(upload_id=upload.pk)
+
+    upload.refresh_from_db()
+
+    assert upload.import_status == "errored"
+    assert upload.import_details == {
+        "error_code": "Uploading files without a MusicBrainz ID is not permitted in this pod",
+        "detail": "You can tag you files with MusicBrainz Picard",
+    }