old_contents: from django.test import TestCase
  
  # Create your tests here.
  
new_contents: from django.test import TestCase
  from rest_framework.test import APIClient
  from users.models import User
  
  
  # Create your tests here.
  class TokenLoginTestCase(TestCase):
      fixtures = ['users.json']
  
      def testAttemptSubmit(self):
          user = User.objects.get(username='matija')
          client = APIClient()
          client.credentials(HTTP_AUTHORIZATION='Token ' + user.auth_token.key)
          response = client.post('/api/attempts/submit/',
                                 [
                                     {
                                         "solution": "\ndef linearna(a, b):\\n    return -b / a\\n",
                                         "valid": True,
                                         "feedback": ["prvi", "drugi feedbk"],
                                         "secret": [], "part": 1
                                     },
                                     {
                                         "solution": "\\nimport math\\n\\ndef ploscina(n, a):\\n"
                                                     "return 0.25  a**2  n / math.tan(math.pi / n)",
                                         "valid": True,
                                         "feedback": [],
                                         "secret": [],
                                         "part": 2
                                     }
                                 ],
                                 format='json'
                                 )
          self.assertEqual(response.status_code, 200)
  
subject: Add simple Attempt submit test