convenient methods for testing
npm install --save-dev test-utils.js
const expect = require('expect.js');
const testUtil = require('test-utils.js');
//tests only 0 and 5th test from the list of tests. rest of them should be ignored
[0,1,2,3,4,5].forEach(function (test, index) {
testUtil.run([0,5], index)(index + ": should be even number", function () {
expect(test%2 === 0).to.be.ok();
})
})