'Verify we cannot add a discussion module to a Library.'

def test_no_add_discussion(self):

    lib = LibraryFactory.create()
    response = self.create_xblock(parent_usage_key=lib.location, display_name='Test', category='discussion')
    self.assertEqual(response.status_code, 400)
    lib = self.store.get_library(lib.location.library_key)
    self.assertFalse(lib.children)
