Run black on the CI with --check option

.travis.yml

@@ -13,8 +13,10 @@ before_install:
 
 matrix:
   include:
-    - name: Tox test
+    - name: Test
       script: tox -e py36
+    - name: Black
+      script: tox -e black
     - name: Basic Docker
       script: sh tests/test_docker.sh
     - name: Docker with Celery

tests/test_docker.sh

@@ -19,6 +19,9 @@ cd my_awesome_project
 # run the project's type checks
 docker-compose -f local.yml run django mypy my_awesome_project
 
+# Run black with --check option
+docker-compose -f local.yml run django black --check my_awesome_project
+
 # run the project's tests
 docker-compose -f local.yml run django pytest
 

tox.ini

@@ -1,7 +1,11 @@
 [tox]
 skipsdist = true
-envlist = py36
+envlist = py36,black
 
 [testenv]
 deps = -rrequirements.txt
 commands = pytest {posargs:./tests}
+
+[testenv:black]
+deps = black
+commands = black --check hooks tests setup.py docs