new_contents: """Tests for the lms module itself."""
  
  from django.test import TestCase
  
  from edxmako import add_lookup, LOOKUP
  from lms import startup
  
  class TemplateLookupTests(TestCase):
      """
      Tests for TemplateLookup.
      """
  
      def test_add_lookup_to_main(self):
          """Test that any template directories added are not cleared when microsites are enabled."""
  
          add_lookup('main', 'external_module', __name__)
          directories = LOOKUP['main'].directories
          self.assertEqual(len([dir for dir in directories if 'external_module' in dir]), 1)
  
          # This should not clear the directories list
          startup.enable_microsites()
          directories = LOOKUP['main'].directories
          self.assertEqual(len([dir for dir in directories if 'external_module' in dir]), 1)
  
subject: Test TemplateLookup dirs are not cleared during lms startup.