Add mock to the testing requirements

gergelypolonkai · gergelypolonkai · commit d8a5803076f0 · 2017-02-01T13:38:42.000+01:00
It was missing, and without them, tests didn’t run.
diff --git a/requirements-test.txt b/requirements-test.txt
@@ -5,4 +5,5 @@ pytest-cov==2.2.1
 pytest-flakes==1.0.1
 pytest-pep8==1.0.6
 pep8==1.7.0
-coverage==4.2
+coverage==4.2
+mock==2.0.0
