old_contents: from io import StringIO
  
  from django.core.management import call_command
  from django.test import TestCase
  
  
  class PipelineTestCase(TestCase):
  
      def test_success(self):
          call_command('collectstatic', '--noinput', stdout=StringIO())
          call_command('clean_staticfilesjson', stdout=StringIO())
  
new_contents: import os
  from io import StringIO
  
  from django.conf import settings
  from django.core.management import call_command
  from django.core.management.base import CommandError
  from django.test import TestCase
  
  
  class PipelineTestCase(TestCase):
      def setUp(self):
          file_path = os.path.join(settings.STATIC_ROOT, 'staticfiles.json')
          if os.path.isfile(file_path):
              os.remove(file_path)
  
      def test_success(self):
          call_command('collectstatic', '--noinput', stdout=StringIO())
          call_command('clean_staticfilesjson', stdout=StringIO())
  
      def test_missing_staticfilesjson(self):
          with self.assertRaises(CommandError):
              call_command('clean_staticfilesjson', stdout=StringIO())
  
subject: Add test for missing staticfiles.json