write tests for serializers; add controllers.streamers + tests

aircox_streamer/urls.py

@@ -4,11 +4,11 @@ from django.utils.translation import gettext_lazy as _
 from aircox.viewsets import SoundViewSet
 
 from . import viewsets
-from .views import StreamerAdminMixin
+from .views import StreamerAdminView
 
 admin.site.route_view(
     "tools/streamer",
-    StreamerAdminMixin.as_view(),
+    StreamerAdminView.as_view(),
     "tools-streamer",
     label=_("Streamer Monitor"),
 )