broadcast
Signature
function broadcast() external;
function broadcast(address who) external;
function broadcast(uint256 privateKey) external;
Description
Using the address that calls the test contract or the address / private key provided as the sender, has the next call (at this call depth only and excluding cheatcode calls) create a transaction that can later be signed and sent onchain.
Examples
function deploy() public {
    cheats.broadcast(ACCOUNT_A);
    Test test = new Test();
    // this won't generate tx to sign
    uint256 b = test.t(4);
    // this will
    cheats.broadcast(ACCOUNT_B);
    test.t(2);
    // this also will, using a private key from your environment variables
    cheats.broadcast(vm.envUint("PRIVATE_KEY"));
    test.t(3);
}