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

Posted by Kathryn Notson
Kathryn Notson
25,941 Points

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

I'm not quite getting the answer to this code challenge. I think the problem is after ".to.have.property({});". Error message: "Version of clone.js DOESN'T work correctly, test expected to fail, but spec passes," or "version of clone.js works correctly, but spec doesn't pass." I've done numerous arrangements of the expectation with either of these error messages. I'm not sure any arrangement passes through clone.js correctly. Everything I've tried is an incorrect answer.

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

describe('clone', function () {
    var clone = require('./clone.js')
    it('should return an object where all properties match', function () {

        expect(clone).to.deep.equal.all.property;

    })
})
clone.js 
function clone (objectForCloning) {
    return Object.assign({}, objectForCloning)
}

module.exports = clone
Are Arntsen
Are Arntsen
11,035 Points
Are Arntsen
Are Arntsen
11,035 Points

Hi!

I also struggled with this one. I skipped it and found the answer later in the course. This should work:

var expect = require('chai').expect

describe('clone', function () {
    var clone = require('./clone.js')
    it('should return an object where all properties match', function () {
        expect(clone({ foo: 'bar' })).to.eql({ foo: 'bar' });
    })
})

1 Answer

Kathryn Notson
Kathryn Notson
25,941 Points
Kathryn Notson
Kathryn Notson
25,941 Points

Are Arnsten:

That's a direct copy from the Chai Assertion Library, but I don't think that's what the instructor was looking for.

Here's the result: "We tried your spec with a version of clone.js that DOESN'T work correctly, expecting test to fail, but it passed.” It's a "Bummer!" statement which means the answer isn't correct & therefore, I can't pass the test question.

Are Arntsen
Are Arntsen
11,035 Points
Are Arntsen
Are Arntsen
11,035 Points

It is almost a direct copy of the Chai Assertion library. You need to put the example object in to the "clone" function. When I do this challenge it passes with the exact syntax as my previous answer. It´s strange that it does not work for you no?

Sebastian Karg
Sebastian Karg
28,705 Points
Sebastian Karg
Sebastian Karg
28,705 Points

Had trouble with this one as well. Tried the above answer and got a bummer too, but found out that I used "to.equal" instead of "to.eql". After fixing this, the test passed.