Fixes for common/lib tests in Django 1.9+

common/lib/conftest.py

-from django.conf import settings
-
-
-def pytest_configure():
-    """
-    Use Django's default settings for tests in common/lib.
-    """
-    settings.configure()

common/lib/pytest.ini

 [pytest]
+DJANGO_SETTINGS_MODULE = openedx.tests.settings
 addopts = --nomigrations --reuse-db --durations=20
 norecursedirs = .cache
 python_classes =

common/lib/xmodule/xmodule/tests/test_services.py

@@ -23,7 +23,8 @@ class DummyConfig(ConfigurationModel):
     """
     Dummy Configuration
     """
-    pass
+    class Meta:
+        app_label = 'xmoduletestservices'
 
 
 class DummyUnexpected(object):

openedx/tests/settings.py

+"""
+Minimal Django settings for tests of common/lib.
+Required in Django 1.9+ due to imports of models in stock Django apps.
+"""
+
+from __future__ import absolute_import, unicode_literals
+
+import tempfile
+
+DATABASES = {
+    'default': {
+        'ENGINE': 'django.db.backends.sqlite3',
+        'NAME': 'default.db',
+        'USER': '',
+        'PASSWORD': '',
+        'HOST': '',
+        'PORT': '',
+    }
+}
+
+INSTALLED_APPS = (
+    'django.contrib.auth',
+    'django.contrib.contenttypes',
+    'django.contrib.sessions',
+    'openedx.core.djangoapps.video_config',
+    'edxval',
+)
+
+MEDIA_ROOT = tempfile.mkdtemp()
+
+SECRET_KEY = 'insecure-secret-key'
+
+USE_TZ = True

tox.ini

 [tox]
-envlist = py27-django{18,111}
+envlist = py27-django{18,19,110,111}
 
 [testenv]
 setenv =
@@ -9,6 +9,8 @@ passenv =
     EDXAPP_TEST_MONGO_HOST
 deps =
     django18: Django>=1.8,<1.9
+    django19: Django>=1.9,<1.10
+    django110: Django>=1.10,<1.11
     django111: Django>=1.11,<2
     -rrequirements/edx/pre.txt
     -rrequirements/edx/github.txt