An example of testing a main component

demo-main.test.js

"use strict";

var assert = require('assert');

const demoMain = require('..');

describe('demo-main', function () {
  context('smoke test', function () {
    it('should add first two numbers and subtract the third', function (done) {
      const a = 100, b = 200, c = 50;
      const expected = a + b - c;
      assert.strictEqual(demoMain( a, b, c ), expected );
      done();
    });
  });
});