text: """Contains the 'manage.py muttest' command."""
  
  from django.conf import settings
  from django.core.management import BaseCommand, CommandError
  
  from django_mutpy.mutpy_runner import run_mutpy_on_app
  
  
  def check_apps(apps):
      """Check if a list of apps is entirely contained in the list of installed apps."""
      for app in apps:
          installed_apps = settings.INSTALLED_APPS
          if app not in installed_apps:
              raise CommandError('App %s not contained in INSTALLED_APPS %s'
                                 % (app, settings.INSTALLED_APPS))
  
  
  class Command(BaseCommand):
      """This command runs MutPy agains one or more Django apps."""
  
      can_import_settings = True
  
      def add_arguments(self, parser):
          """Define cmd arguments."""
          parser.add_argument('app', nargs='+', type=str)
          parser.add_argument('--modules', nargs='+', type=str, default=None)
  
      def handle(self, *args, **options):
          """Run MutPy against the provided apps."""
          check_apps(options['app'])
          for app in options['app']:
              run_mutpy_on_app(app, include_list=options['modules'])
  