use pytest for testing

pytest.ini

@@ -0,0 +1,3 @@
+[pytest]
+DJANGO_SETTINGS_MODULE = tests.settings
+python_files = tests.py test_*.py *_tests.py

requirements_test.txt

@@ -5,3 +5,6 @@ mock>=1.0.1
 flake8>=2.1.0
 tox>=1.7.0
 coveralls
+pytest
+pytest-django
+pytest-cov

runtests.py

@@ -1,26 +0,0 @@
-#!/usr/bin/env python
-# -*- coding: utf-8
-from __future__ import unicode_literals, absolute_import
-
-import os
-import sys
-
-import django
-from django.conf import settings
-from django.test.utils import get_runner
-
-
-def run_tests(*test_args):
-    if not test_args:
-        test_args = ["tests"]
-
-    os.environ["DJANGO_SETTINGS_MODULE"] = "tests.settings"
-    django.setup()
-    TestRunner = get_runner(settings)
-    test_runner = TestRunner()
-    failures = test_runner.run_tests(test_args)
-    sys.exit(bool(failures))
-
-
-if __name__ == "__main__":
-    run_tests(*sys.argv[1:])

tox.ini

@@ -5,9 +5,8 @@ envlist =
 [testenv]
 setenv =
     PYTHONPATH = {toxinidir}:{toxinidir}/django_cryptolock
-commands = coverage run --source django_cryptolock runtests.py
+commands = pytest --cov=django_cryptolock tests/
 deps =
-    django-22: Django>=2.2
     -r {toxinidir}/requirements_test.txt
 basepython =
     py37: python3.7