def METHOD_NAME(self):
    class PolygonMumbaiConfig:
        chain_id = 80001
        rpc_api = "https://polygon-mumbai-rpc.com"
        private_key = DEFAULT_GAS_PAYER_PRIV
    with patch("src.chain.web3.Config.polygon_mumbai", PolygonMumbaiConfig):
        w3 = get_web3(ChainId.POLYGON_MUMBAI.value)
    self.assertIsInstance(w3, Web3)
    self.assertEqual(w3.eth.default_account, DEFAULT_GAS_PAYER)
    self.assertEqual(w3.manager._provider.endpoint_uri, PolygonMumbaiConfig.rpc_api)