diff --git a/tox.ini b/tox.ini
index 0e16b95..db277a7 100644
--- a/tox.ini
+++ b/tox.ini
@@ -4,10 +4,11 @@ envlist = py27,py34
 [testenv]
 deps =
   pytest
+  pytest-cov
   flake8
   isort
 
 commands =
   flake8 dcos tests
-  isort -rc -c -vb dcos tests
-  py.test tests
+  isort -rc -c -vb {envsitepackagesdir}/dcos
+  py.test --cov {envsitepackagesdir}/dcos tests