1 files changed, 5 insertions, 0 deletions
diff --git a/tox.ini b/tox.ini
index 13057e4..f45ed53 100644
--- a/tox.ini
+++ b/tox.ini
@@ -9,6 +9,11 @@ description = lint with flake8
 deps = flake8
 commands = flake8 --max-line-length=88
 
+[testenv:black]
+description = auto formatter with black
+deps = black
+commands = black .
+
 [testenv:pytest]
 description = test cases
 usedevelop = True