How to call a shell command to call an executable js file passing arguments from another js (needed to test the cli interface)?

Question

Software testing

Eats go.js file, passing arguments catches commander.js

const program = require('commander');
program
  .version('0.0.1', '-v, --version')
  .option('-l, --lol ', console.log('Hello my friend!'))
  .parse(process.argv);

There is a spec.js file for tests, we call the go.js file for execution in it, but something obviously does not go according to plan.

function run_cmd(cmd, args, callBack ) {
    const spawn = require('child_process').spawn;
    const child = spawn(cmd, args);
    const resp = "";
    child.stdout.on('data', function (buffer) { resp += buffer.toString() });
    child.stdout.on('end', function() { callBack (resp) });
};

run_cmd( "./go.js", ["-l"], function(text) { console.log (text) })

Tell me the solution to the problem of calling a file

Answer 1

const { spawn } = require('child_process');

function run_cmd(cmd, args, callBack) {
    const child = spawn(cmd, args);

    let resp = "";
    child.stdout.on('data', function (buffer) { resp += buffer.toString() });
    child.stdout.on('end', function() { callBack (resp) });
    child.stdout.on('error', callBack);
};

run_cmd("./go.js", ["-l"], function(err, text) {
   if (err) return console.error(err);

   console.log(text)
});