old_contents: """Unit tests for helpers.py"""
  
  from django.test import TestCase
  
  from .helpers import render_template
  
  
  class HelperTests(TestCase):
      """Tests for helpers"""
  
      def test_render_template(self):
          """Check if render_template helper works"""
          class ErrorSource:
              slug = 'sampleplg'
  
          # working sample
          response = render_template(ErrorSource(), 'sample/sample.html', {'abc': 123})
          self.assertEqual(response, '<h1>123</h1>')
  
          # Wrong sample
          response = render_template(ErrorSource(), 'sample/wrongsample.html', {'abc': 123})
          self.assertTrue('lert alert-block alert-danger' in response)
          self.assertTrue('Template file <em>sample/wrongsample.html</em>' in response)
  
new_contents: """Unit tests for helpers.py"""
  
  from django.test import TestCase
  
  from .helpers import render_template
  
  
  class HelperTests(TestCase):
      """Tests for helpers"""
  
      def test_render_template(self):
          """Check if render_template helper works"""
          class ErrorSource:
              slug = 'sampleplg'
  
          # working sample
          response = render_template(ErrorSource(), 'sample/sample.html', {'abc': 123})
          self.assertEqual(response, '<h1>123</h1>\n')
  
          # Wrong sample
          response = render_template(ErrorSource(), 'sample/wrongsample.html', {'abc': 123})
          self.assertTrue('lert alert-block alert-danger' in response)
          self.assertTrue('Template file <em>sample/wrongsample.html</em>' in response)
  
subject: fix assertation