Unable to deploy contract with params from another contract using Truffle

Question

I have two Contracts - a contract with a single constructor argument (ContractB), and a launcher that deploys new instances (Launcher).

Using Truffle for testing how can I link the contracts without deploying contract B, given that contract B will return an error if deployed without prams

Error: ContractB contract constructor expected 1 arguments, received 0

Here is the link to Git repository

deploy_contracts.js

var Launcher = artifacts.require("./Launcher.sol");
var ContractB = artifacts.require("./ContractB.sol");

module.exports = function(deployer) {
  deployer.deploy(ContractB);
  deployer.link(ContractB, Launcher);
  deployer.deploy(Launcher);
};

Test File

var Launcher = artifacts.require("./Launcher.sol");

contract('Launcher', function(accounts) {
  it("Launcher Deploy", function() {
    return Launcher.deployed().then(function(instance) {
      console.log(instance)
    })
  });
});

Launcher.sol

pragma solidity ^0.4.18;

import "./ContractB.sol";

contract launcher {

    function launch() public returns(address) {
        ContractB contractLocation = new ContractB(msg.sender);
        return(contractLocation);
    }
}

ContractB.sol

pragma solidity ^0.4.18;

contract ContractB {
    address public owner;
    constructor(address addr) public {
    owner = addr;
  }

    function get() public view returns(address) {
        return(owner);
    }
}

Here is the link to Git repository

Answer 1

You don't deploy ContractB with migrations.

You should use a migration to deploy Launcher. There is no need to deploy ContractB because that's Launcher's job.

Couple of things to watch out for:

• Make sure your event values have name https://github.com/trufflesuite/truffle/issues/494
• If truffle complains you may be able to deploy and link your contractB dependencies to launcher and leave the deployment of ContractB to Launcher
• Consider Truffle version 5 https://github.com/trufflesuite/truffle/pull/1129#Bring-your-own-compiler