diff --git a/testing/python/integration.py b/testing/python/integration.py
index e070b4398..b51fc7766 100644
--- a/testing/python/integration.py
+++ b/testing/python/integration.py
@@ -128,11 +128,12 @@ class TestMockDecoration:
                 return "mock_basename"
             @mock.patch("os.path.abspath")
             @mock.patch("os.path.normpath")
-            @mock.patch("os.path.basename",new=mock_basename)
+            @mock.patch("os.path.basename", new=mock_basename)
             def test_someting(normpath, abspath, tmpdir):
                 abspath.return_value = "this"
                 os.path.normpath(os.path.abspath("hello"))
                 normpath.assert_any_call("this")
+                assert os.path.basename("123") == "mock_basename"
         """)
         reprec = testdir.inline_run()
         reprec.assertoutcome(passed=2)
diff --git a/tox.ini b/tox.ini
index f56865819..d960cd22b 100644
--- a/tox.ini
+++ b/tox.ini
@@ -7,6 +7,7 @@ changedir=testing
 commands= py.test --lsof -rfsxX --junitxml={envlogdir}/junit-{envname}.xml []
 deps=
     nose
+    mock
 
 [testenv:genscript]
 changedir=.