index.js

#!/usr/bin/env node
'use strict';
const terminal = require('child_process');
let currentCommand;
const prettyMs = require('pretty-ms');
const argv = require('minimist')(process.argv);
const chalk = require('chalk');
const scriptutils = require('scriptutils');

let timesRan = 0;
let totalTimesToRun = argv.times;
let command = argv.command || argv.cmd;
let timeTook = [];
let startTime = 0;

if (!totalTimesToRun || !command) {
	return console.log("Please ensure you have defined times and command.");
}

function onDone(exitCodes) {
	timeTook.push(Date.now() - startTime);
	if (exitCodes > 0) {
		// test failed
		complete("Failed");
	} else {
		// test succeeded
		checkRunTest();
	}
}
function onData(data) {
	process.stdout.write(data);
}
function onError(data) {
	process.stdout.write(data);
}

function checkRunTest() {
	if (timesRan >= totalTimesToRun) {
		complete("Success");
	} else {
		runTest();
	}
}
function runTest() {
	startTime = Date.now();
	timesRan++;
	currentCommand = terminal.spawn(command.split(" ")[0], command.split(" ").remove(0), { stdio: "inherit" });
	currentCommand.on('exit', onDone);
	// currentCommand.stdout.on('data', onData);
	// currentCommand.stderr.on('data', onError);
}

function complete(status) {
	console.log("Total time took: " + prettyMs(timeTook.reduce((total, time) => total + time, 0)));
	console.log("Average time took: " + prettyMs(timeTook.reduce((total, time) => total + time, 0)/timesRan));
	console.log("Max time took: " + prettyMs(Math.max.apply(Math, timeTook)));
	console.log("Min time took: " + prettyMs(Math.min.apply(Math, timeTook)));

	if (status == "Success") {
		console.log(chalk.bold.green("Completed " + totalTimesToRun + " times with no errors"));
	} else if (status == "Failed") {
		console.log(chalk.bold.red("Test failed on attempt: " + timesRan + " of " + totalTimesToRun));
	} else {
		console.log(chalk.bold.blue("Cancelled. Finished " + timesRan + " of " + totalTimesToRun + " with no errors"));
	}
	process.exit();
}

checkRunTest();


//catches ctrl+c event
process.on('SIGINT', exitEarly);

// catches "kill pid" (for example: nodemon restart)
process.on('SIGUSR1', exitEarly);
process.on('SIGUSR2', exitEarly);

function exitEarly() {
	timesRan--; // current test is not complete
	complete("Quit");
	
}