diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 345451f1b1c51b2b7c9f0426fe447fe7ed34e743..5dfbf0642691e4033bac3f82bdc6fcdeff49f878 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -20,7 +20,7 @@ black:
   before_script:
     - pip install black
   script:
-    - black --check api/
+    - black --check --diff api/
 
 flake8:
   image: python:3.6
@@ -30,7 +30,7 @@ flake8:
   before_script:
     - pip install flake8
   script:
-    - flake8 api
+    - flake8 -v api
   cache:
     key: "$CI_PROJECT_ID__flake8_pip_cache"
     paths:
diff --git a/api/requirements/local.txt b/api/requirements/local.txt
index c5f2ad0b7f7921a3af127f971f93eb4a3c80ad30..f11f976b8b165a1fff0fa219fd921a1644ff9084 100644
--- a/api/requirements/local.txt
+++ b/api/requirements/local.txt
@@ -9,3 +9,4 @@ django-debug-toolbar>=1.9,<1.10
 
 # improved REPL
 ipdb==0.8.1
+black
diff --git a/api/tests/music/test_activity.py b/api/tests/music/test_activity.py
index 5286f1fef1c19cf0e1163f035dcc0d20100a59b3..8c119394d620b28eac7a594a89bae552e968c3ad 100644
--- a/api/tests/music/test_activity.py
+++ b/api/tests/music/test_activity.py
@@ -1,5 +1,3 @@
-
-
 def test_get_track_activity_url_mbid(factories):
     track = factories["music.Track"]()
     expected = "https://musicbrainz.org/recording/{}".format(track.mbid)
diff --git a/api/tests/subsonic/test_views.py b/api/tests/subsonic/test_views.py
index f823a443ec4dec2c41bc138714a11cf1179fdc56..1523a2f6270746a909bc670a354f027e9060eed0 100644
--- a/api/tests/subsonic/test_views.py
+++ b/api/tests/subsonic/test_views.py
@@ -163,9 +163,7 @@ def test_unstar(f, db, logged_in_api_client, factories):
     url = reverse("api:subsonic-unstar")
     assert url.endswith("unstar") is True
     track = factories["music.Track"]()
-    factories["favorites.TrackFavorite"](
-        track=track, user=logged_in_api_client.user
-    )
+    factories["favorites.TrackFavorite"](track=track, user=logged_in_api_client.user)
     response = logged_in_api_client.get(url, {"f": f, "id": track.pk})
 
     assert response.status_code == 200