unit tests are now blended with statement and branch coverage. If

coverage drops, tests will now fail. The coverage threshold will raise
as we get more code under test.

.coveragerc

@@ -1,6 +1,12 @@
 [run]
+source = djstripe
+branch = True
 omit =
     djstripe/migrations/*
     djstripe/south_migrations/*
     djstripe/management/*
-    djstripe/admin.py
+    djstripe/admin.py
+    djstripe/*__init__.py
+
+[html]
+directory = "htmlcoverage"

.gitignore

@@ -24,6 +24,7 @@ logfile
 pip-log.txt
 
 # Unit test / coverage reports
+cover/*
 .coverage
 .tox
 nosetests.xml

CONTRIBUTING.rst

@@ -79,7 +79,8 @@ Ready to contribute? Here's how to set up `dj-stripe` for local development.
 Now you can make your changes locally.
 
 6. When you're done making changes, check that your changes pass flake8 and the
-tests, including testing other Python versions with tox::
+tests, including testing other Python versions with tox. If your changes cause code
+coverage to drop, the tests will fail.::
 
     $ pip install -r requirements_test.txt
     $ flake8 djstripe tests
@@ -94,12 +95,7 @@ tests, including testing other Python versions with tox::
 
 To get flake8 and tox, just pip install them into your virtualenv. 
 
-7. Check the test coverage report. Make sure coverage hasn't dropped::
-
-    $ coverage run --source djstripe runtests.py
-    $ coverage report -m
-
-8. Commit your changes and push your branch to GitHub::
+7. Commit your changes and push your branch to GitHub::
 
     $ git add .
     $ git commit -m "Your detailed description of your changes."

runtests.py

@@ -36,8 +36,8 @@
         "django.contrib.auth.middleware.AuthenticationMiddleware",
     ),
     SITE_ID=1,
-    STRIPE_PUBLIC_KEY=os.environ.get("STRIPE_PUBLIC_KEY", ""),
-    STRIPE_SECRET_KEY=os.environ.get("STRIPE_SECRET_KEY", ""),
+    STRIPE_PUBLIC_KEY=os.environ.get("STRIPE_PUBLIC_KEY", "pk_test_lOasUMgiIA701U9wZnL6Zo6a"),
+    STRIPE_SECRET_KEY=os.environ.get("STRIPE_SECRET_KEY", "sk_test_nZBY1yjOJ75iFKGjorN29GiA"),
     DJSTRIPE_PLANS={},
     DJSTRIPE_SUBSCRIPTION_REQUIRED_EXCEPTION_URLS=(
         "(admin)",
@@ -46,7 +46,12 @@
     ),
     TEMPLATE_DIRS = [
         os.path.join(TESTS_ROOT, "tests/templates"),
-    ]
+    ],
+    NOSE_ARGS = ['--with-coverage',
+                 '--cover-branches',
+                 '--cover-html',
+                 '--cover-package=djstripe',
+                 '--cover-min-percentage=64']
 )
 
 # Avoid AppRegistryNotReady exception