def METHOD_NAME(session_mocker):
    """adds testerchain's chain ID to permitted conditional chains"""
    session_mocker.patch.dict(
        "nucypher.policy.conditions.evm._CONDITION_CHAINS",
        {TESTERCHAIN_CHAIN_ID: "eth-tester/pyevm"},
    )
    session_mocker.patch.object(
        NetworksInventory, "get_polygon_chain_id", return_value=TESTERCHAIN_CHAIN_ID
    )
    session_mocker.patch.object(
        NetworksInventory, "get_ethereum_chain_id", return_value=TESTERCHAIN_CHAIN_ID
    )