'Test un-mapping a namespace that was never explicitly mapped.'

def test_unmap_namespace_wildcard(self):

    namespace_config = NamespaceConfig(namespace_options={'db2.*': 'db2.f*', 'db_*.foo': 'db_new_*.foo'})
    self.assertEqual(namespace_config.unmap_namespace('db2.foo'), 'db2.oo')
    self.assertEqual(namespace_config.unmap_namespace('db_new_123.foo'), 'db_123.foo')
