old_contents: import logging
  
  from django.test import TestCase
  
  from mama_cas.utils import is_scheme_https
  
  
  logging.disable(logging.CRITICAL)
  
  
  class UtilsTests(TestCase):
      def test_is_scheme_https(self):
          """
          When called with a URL, ``is_scheme_https`` should return True
          or False depending on the scheme of the parameter URL.
          """
          self.assertTrue(is_scheme_https('https://www.test.com/'))
          self.assertFalse(is_scheme_https('http://www.test.com/'))
  
new_contents: import logging
  
  from django.test import TestCase
  
  from mama_cas.utils import add_query_params
  from mama_cas.utils import is_scheme_https
  
  
  logging.disable(logging.CRITICAL)
  
  
  class UtilsTests(TestCase):
      def test_add_query_params(self):
          """
          When called with a URL and a dict of parameters, ``add_query_params()``
          should insert the parameters into the existing URL.
          """
          url = 'http://www.example.com/?test3=blue'
          params = { 'test1': 'red', 'test2': '', 'test3': 'indigo' }
          url = add_query_params(url, params)
  
          self.assertIn('test1=red', url)
          # Parameters with empty values should be ignored
          self.assertNotIn('test2=', url)
          # Existing parameters with the same name should be overwritten
          self.assertIn('test3=indigo', url)
  
      def test_is_scheme_https(self):
          """
          When called with a URL, ``is_scheme_https()`` should return True
          or False depending on the scheme of the parameter URL.
          """
          self.assertTrue(is_scheme_https('https://www.example.com/'))
          self.assertFalse(is_scheme_https('http://www.example.com/'))
  
subject: Add tests for add_query_params()