diff --git a/sandbox/__init__.py b/sandbox/__init__.py
--- a/sandbox/__init__.py
+++ b/sandbox/__init__.py
@@ -1,6 +1,11 @@
 from datetime import datetime
 
 
+def some_stuff(toto):
+    "nothing fancy here"
+    return toto
+
+
 def useful_function():
     "telling the truth might be useful"
     return 42
diff --git a/tox.ini b/tox.ini
--- a/tox.ini
+++ b/tox.ini
@@ -13,3 +13,12 @@
   flake8
 commands =
   {envpython} -m flake8
+
+
+[testenv:flake8-phab]
+skip_install = true
+deps =
+  flake8
+  git+https://framagit.org/douardda/flake8-phabricator-formatter.git
+commands =
+  {envpython} -m flake8 --format=phabricator --output-file=.phabricator-lint