'Nonexistent namespaces raise errors.'

def test_non_existent_namespace(self):

    test_urls = ['blahblah:urlobject-view', 'test-ns1:blahblah:urlobject-view']
    for name in test_urls:
        with self.subTest(name=name):
            with self.assertRaises(NoReverseMatch):
                reverse(name)
