start-broadcast.md

startBroadcast

Signature

function startBroadcast() external;

function startBroadcast(address who) external;

function startBroadcast(uint256 privateKey) external;

Description

Using the address that calls the test contract or the address / private key provided as the sender, have all subsequent calls (at this call depth only) create transactions that can later be signed and sent onchain.

Examples

function t(uint256 a) public returns (uint256) {
    uint256 b = 0;
    emit log_string("here");
    return b;
}

function deployOther() public {
    cheats.startBroadcast(ACCOUNT_A);
    Test test = new Test();
    
    // will trigger a transaction
    test.t(1);
    
    cheats.stopBroadcast();

    // broadcast again, this time using a private key from your environment variables
    cheats.startBroadcast(vm.envUint("PRIVATE_KEY"));
    test.t(3);
    cheats.stopBroadcast();
}