codestyle check

.buildkite/pipeline.yml

@@ -5,8 +5,8 @@ steps:
 
   - command:
       - "python -m pip install tox"
-      - "tox -e pep8"
-    label: "\U0001F9F9 PEP-8"
+      - "tox -e check_codestyle"
+    label: "\U0001F9F9 Check Style"
     plugins:
       - docker#v3.0.1:
           image: "python:3.6"

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = packaging, py35, py36, py37, pep8, check_isort
+envlist = packaging, py35, py36, py37, check_codestyle, check_isort
 
 [base]
 deps =
@@ -112,12 +112,15 @@ deps =
 commands =
     check-manifest
 
-[testenv:pep8]
+[testenv:check_codestyle]
 skip_install = True
 basepython = python3.6
 deps =
     flake8
-commands = /bin/sh -c "flake8 synapse tests scripts scripts-dev scripts/hash_password scripts/register_new_matrix_user scripts/synapse_port_db synctl {env:PEP8SUFFIX:}"
+    black
+commands =
+    python -m black --check --diff .
+    /bin/sh -c "flake8 synapse tests scripts scripts-dev scripts/hash_password scripts/register_new_matrix_user scripts/synapse_port_db synctl {env:PEP8SUFFIX:}"
 
 [testenv:check_isort]
 skip_install = True