title: Using fixtures in django.test.TestCase
body: <p>I try to use fixtures in django.test.TestCase. It works correctly, but I do it for the first time. What is the best practice in this case?</p>
  <pre><code>from django.test import Client, TestCase
      
  class SomeTestClass(TestCase):
      fixtures = ['fixtures.json',]
  
      @classmethod
      def setUpClass(cls):
          super().setUpClass()
          cls.user = User.objects.get(id=1) # from fixtures
          cls.authorized_client = Client()
          cls.authorized_client.force_login(cls.user)
          cls.someobject = Someclass.objects.get(id=1) # from fixtures
          cls.anotherobject = Anotherclass.objects.get(id=1) # from fixtures
  
      def test(self):
          ...
  </code></pre>