write metadata tests; start source tests

aircox_streamer/controllers/__init__.py

@@ -1,9 +1,16 @@
 # TODO: for the moment, update in station and program names do not update the
 #       related fields.
 
-from .base import Request
+from .metadata import Metadata, Request
 from .streamer import Streamer
 from .sources import Source, PlaylistSource, QueueSource
 
 
-__all__ = ("Request", "Streamer", "Source", "PlaylistSource", "QueueSource")
+__all__ = (
+    "Metadata",
+    "Request",
+    "Streamer",
+    "Source",
+    "PlaylistSource",
+    "QueueSource",
+)