Use django build-in test runner

.travis.yml

@@ -46,5 +46,5 @@ install:
 - pip install -r test_requirements.txt
 - pip install -q -e .
 script:
-- py.test
+- python setup.py test
 sudo: false

setup.py

@@ -1,7 +1,17 @@
+import sys
 from setuptools import find_packages, setup
+import os
 
 from django_mailbox import __version__ as version_string
 
+os.environ['DJANGO_SETTINGS_MODULE'] = 'django_mailbox.tests.settings'
+
+from django.core import management
+
+if sys.argv[-1] == 'test':
+    management.execute_from_command_line()
+    sys.exit()
+
 tests_require = [
     'django',
     'mock',

tox.ini

@@ -7,7 +7,7 @@ deps=
     -r{toxinidir}/test_requirements.txt
 sitepackages=False
 commands=
-    py.test {posargs}
+    python setup.py test {posargs}
 
 [testenv:flake8]
 deps=flake8