light tester implementation (describe, it, assert)

light-tester.js

const path = require('path');
const chalk = require('chalk');
const fileToTest = process.argv[2];

if(!fileToTest) throw new Error('define the file to test');

let PADDING = -4;
let success = 0;
let fails = 0;
function describe(suite, fn = function(){}) {
    PADDING += 4;

    console.log(chalk.yellow(' '.repeat(PADDING) + suite));

    fn();

    PADDING -= 4;
}

function it(suite, fn = function(){}) {
    try {
        fn();
        success++;
        console.log(chalk.green(' '.repeat(PADDING + 4) + '✓ ' + suite));
    } catch(error) {
        console.log(chalk.red(' '.repeat(PADDING + 4) + 'x ' + suite + ' - ' + error));
        fails++;
    }
}

function assert(result, message) {
    if(result !== true) throw (message || new Error().stack);
}

global.describe = describe;
global.it = it;
global.assert = assert;

require(path.resolve(fileToTest));

console.log('\n' + chalk.red(`${fails} tests failed`) + ', ' + chalk.green(`${success} tests succeed`));