fix forgotten 400 test

rest_framework/tests/authentication.py

@@ -174,7 +174,7 @@ class TokenAuthTests(TestCase):
         client = Client(enforce_csrf_checks=True)
         response = client.post('/auth-token/login/', 
                                json.dumps({'username': self.username}), 'application/json')
-        self.assertEqual(response.status_code, 400)
+        self.assertEqual(response.status_code, 401)
 
     def test_token_login_form(self):
         """Ensure token login view using form POST works."""