'Test that by default, all namespaces are kept without renaming'

def test_default(self):

    namespace_config = NamespaceConfig()
    self.assertEqual(namespace_config.unmap_namespace('db1.col1'), 'db1.col1')
    self.assertEqual(namespace_config.map_db('db1'), ['db1'])
    self.assertEqual(namespace_config.map_namespace('db1.col1'), 'db1.col1')
