Add pytest-warning to tests and correct some warnings, complete coverage (essentially branch)

cas_server/tests/settings.py

@@ -51,6 +51,22 @@ MIDDLEWARE_CLASSES = [
     'django.middleware.locale.LocaleMiddleware',
 ]
 
+TEMPLATES = [
+    {
+        'APP_DIRS': True,
+        'BACKEND': 'django.template.backends.django.DjangoTemplates',
+        'DIRS': [],
+        'OPTIONS': {
+            'context_processors': [
+                'django.template.context_processors.debug',
+                'django.template.context_processors.request',
+                'django.contrib.auth.context_processors.auth',
+                'django.contrib.messages.context_processors.messages'
+            ]
+        }
+    }
+]
+
 ROOT_URLCONF = 'cas_server.tests.urls'
 
 # Database