Add coverage to test run

tox.ini

@@ -24,6 +24,7 @@ deps =
   django111: Django>=1.11,<1.12
   django-master: https://github.com/django/django/archive/master.tar.gz
   jinja2
+  coverage
   jsmin==2.2.0
   ply==3.4
   slimit==0.8.1
@@ -31,7 +32,8 @@ setenv =
     DJANGO_SETTINGS_MODULE = tests.settings
     PYTHONPATH = {toxinidir}
 commands =
-    {envbindir}/django-admin.py test {posargs:tests}
+    {envbindir}/coverage run --source pipeline {envbindir}/django-admin.py test {posargs:tests}
+    {envbindir}/coverage report
 
 [testenv:docs]
 basepython = python2.7