Added /api-token-auth/ endpoint test

Also set TEST_REQUEST_DEFAULT_FORMAT to json in default.py

backend/core/tests/test_auth.py

+from rest_framework.test import APIClient, APITestCase
+from core.models import UserAccount
+
+
+class AuthTests(APITestCase):
+    @classmethod
+    def setUpTestData(cls):
+        cls.user = UserAccount.objects.create(username='user')
+        cls.user.set_password('p')
+        cls.user.save()
+        cls.client = APIClient()
+
+    def test_get_token(self):
+        response = self.client.post('/api-token-auth/',
+                                    {'username': 'user',
+                                     'password': 'p'}, format='json')
+        self.assertContains(response, 'token')

backend/grady/settings/default.py

@@ -154,6 +154,7 @@ REST_FRAMEWORK = {
         'rest_framework.authentication.SessionAuthentication',
         'rest_framework.authentication.BasicAuthentication',
     ),
+    'TEST_REQUEST_DEFAULT_FORMAT': 'json',
 }
 
 JWT_AUTH = {