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JavaScript JavaScript Unit Testing Behavior Driven Development with Mocha & Chai A Testing Test!

Stephen Printup
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.a{fill-rule:evenodd;}techdegree
Stephen Printup
UX Design Techdegree Student 45,252 Points
Posted by Stephen Printup
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Stephen Printup
UX Design Techdegree Student 45,252 Points

Write a test spec that proves the clone function in clone.js returns an object where all properties match.

I've looked through the docs and a method that tests properties isn't obvious. Am I supposed to loop through the keys or the values? Am I over thinking this?

clone_spec.js 
var expect = require('chai').expect

describe('clone', function () {
    var clone = require('./clone.js')
    it('some description string', function () {

        // YOUR CODE HERE
        expect(clone).to.have.all.keys();
    })
})
clone.js 
function clone (objectForCloning) {
    return Object.assign({}, objectForCloning)
}

module.exports = clone

2 Answers

Mario Leiva
Mario Leiva
45,833 Points
Mario Leiva
Mario Leiva
45,833 Points

I think this helps

expect(clone({ foo: 1, bar: 2 })).to.have.any.keys('foo', 'baz');

meftimova
.a{fill-rule:evenodd;}techdegree
meftimova
Full Stack JavaScript Techdegree Student 8,349 Points

Or expect(clone({ foo: 1, bar: 2 })).to.have.all.keys('foo', 'bar');

Brian Polonia
Brian Polonia
25,139 Points
Brian Polonia
Brian Polonia
25,139 Points

What worked for me was: 

var expect = require('chai').expect

describe('clone', function () {
    var clone = require('./clone.js')
    it('some description string', function () {

        // YOUR CODE HERE

      var obj1 = {foo: 1, bar: 2};

      expect(clone(obj1)).to.deep.equal(obj1);

    })
})

I created the arbitrary obj1 to pass to clone. I called clone inside expect which creates a clone of the object passed, obj1, and used .to.deep.equal and passed the obj1 to see if the object and its properties match the clone created by the function clone.

A bit verbose, I know. I'm doing it for my benefit, to get better at explaining these things :)

Jean Paul Giraldo
Jean Paul Giraldo
15,701 Points
Jean Paul Giraldo
Jean Paul Giraldo
15,701 Points

I tried this exact same thing, but somehow mine didn't pass