              default="test*.py",
              help='The test matching pattern. Defaults to test*.py.')
          parser.add_argument('-k', '--keepdb', action='store_true', dest='keepdb',
              default=False,
              help='Preserve the test DB between runs. Defaults to False')
  
      def setup_test_environment(self, **kwargs):
          setup_test_environment()
          settings.DEBUG = False
          unittest.installHandler()
 
</s> remove         return reorder_suite(suite, self.reorder_by)
 </s> add         return reorder_suite(suite, self.reorder_by, self.reverse) </s> remove * Added the ability to preserve the test database by adding the
  :djadminopt:`--keepdb` flag.
 </s> add * Added options to the :djadmin:`test` command to preserve the test database
  (:djadminopt:`--keepdb`) and to run the test cases in reverse order
  (:djadminopt:`--reverse`). </s> remove .. class:: DiscoverRunner(pattern='test*.py', top_level=None, verbosity=1, interactive=True, failfast=True, keepdb=False **kwargs)
 </s> add .. class:: DiscoverRunner(pattern='test*.py', top_level=None, verbosity=1, interactive=True, failfast=True, keepdb=False, reverse=False, **kwargs)
            help='Preserves the test DB between runs.')
        parser.add_argument('-r', '--reverse', action='store_true', dest='reverse',
            default=False,
            help='Reverses test cases order.')
              default="test*.py",
              help='The test matching pattern. Defaults to test*.py.')
          parser.add_argument('-k', '--keepdb', action='store_true', dest='keepdb',
              default=False,
            help='Preserves the test DB between runs.')
        parser.add_argument('-r', '--reverse', action='store_true', dest='reverse',
            default=False,
            help='Reverses test cases order.')
  
      def setup_test_environment(self, **kwargs):
          setup_test_environment()
          settings.DEBUG = False
          unittest.installHandler()
keep keep keep keep replace keep keep keep keep keep
 Fixed #23742 -- Added an option to reverse tests order.

This is useful for debugging side effects affecting tests that
are usually executed before a given test. Full suite and pair
tests sort cases more or less deterministically, thus some test
cross-dependencies are easier to reveal by reversing the order.

Thanks Preston Timmons for the review. 
django/test/runner.py