old_contents: import csv
  import io
  from django.test import TestCase
  from django.http import HttpResponse
  from django.contrib.admin.sites import AdminSite
  from django.contrib.auth.models import User
  from billjobs.admin import UserAdmin
  
  class MockRequest(object):
              pass
  
  class EmailExportTestCase(TestCase):
      """ Tests for email account export """
  
      fixtures = ['account_test.yaml']
  
      def setUp(self):
          self.site = AdminSite()
          self.query_set = User.objects.all()
  
      def test_method_is_avaible(self):
          """ Test UserAdmin class has method export_email """
          self.assertTrue(hasattr(UserAdmin, 'export_email'))
  
      def test_method_is_model_admin_action(self):
          """ Test method is an custom action for user admin """
          self.assertTrue('export_email' in UserAdmin.actions)
  
      def test_action_has_a_short_description(self):
          """ Test method has a short description """
          self.assertEqual(UserAdmin.export_email.short_description,
                  'Export email of selected users')
  
      def test_action_return_http_response(self):
          """ Test method return an HttpResponse """
          user_admin = UserAdmin(User, self.site)
          response = user_admin.export_email(request=MockRequest(),
                  queryset=self.query_set)
          self.assertIsInstance(response, HttpResponse)
  
      def test_action_return_csv(self):
          """ Test method return text/csv as http response content type """
          user_admin = UserAdmin(User, self.site)
          response = user_admin.export_email(request=MockRequest(),
                  queryset=self.query_set)
          self.assertEqual(response.get('Content-Type'), 'text/csv')
  
      def test_action_return_csv_content(self):
          """ Test method return csv content """
          user_admin = UserAdmin(User, self.site)
          response = user_admin.export_email(request=MockRequest(),
                  queryset=self.query_set)
          output = io.StringIO()
          writer = csv.writer(output)
          for email in User.objects.values_list('email'):
              writer.writerow(email)
          self.assertEqual(response.content.decode(), output.getvalue())
  
new_contents: import csv
  import io
  from django.test import TestCase
  from django.http import HttpResponse
  from django.contrib.admin.sites import AdminSite
  from django.contrib.auth.models import User
  from billjobs.admin import UserAdmin
  
  class MockRequest(object):
              pass
  
  class EmailExportTestCase(TestCase):
      """ Tests for email account export """
  
      fixtures = ['test_api_user.yaml']
  
      def setUp(self):
          self.site = AdminSite()
          self.query_set = User.objects.all()
  
      def test_method_is_avaible(self):
          """ Test UserAdmin class has method export_email """
          self.assertTrue(hasattr(UserAdmin, 'export_email'))
  
      def test_method_is_model_admin_action(self):
          """ Test method is an custom action for user admin """
          self.assertTrue('export_email' in UserAdmin.actions)
  
      def test_action_has_a_short_description(self):
          """ Test method has a short description """
          self.assertEqual(UserAdmin.export_email.short_description,
                  'Export email of selected users')
  
      def test_action_return_http_response(self):
          """ Test method return an HttpResponse """
          user_admin = UserAdmin(User, self.site)
          response = user_admin.export_email(request=MockRequest(),
                  queryset=self.query_set)
          self.assertIsInstance(response, HttpResponse)
  
      def test_action_return_csv(self):
          """ Test method return text/csv as http response content type """
          user_admin = UserAdmin(User, self.site)
          response = user_admin.export_email(request=MockRequest(),
                  queryset=self.query_set)
          self.assertEqual(response.get('Content-Type'), 'text/csv')
  
      def test_action_return_csv_content(self):
          """ Test method return csv content """
          user_admin = UserAdmin(User, self.site)
          response = user_admin.export_email(request=MockRequest(),
                  queryset=self.query_set)
          output = io.StringIO()
          writer = csv.writer(output)
          for email in User.objects.values_list('email'):
              writer.writerow(email)
          self.assertEqual(response.content.decode(), output.getvalue())
  
subject: Change name of fixture file