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

How to write an expectation that an object returned by a function have all properties match?

I tried by using the following,

var obj = {x: {a: 1}}; expect(clone(obj).to.deep.equal(obj);

//where clone() will return a cloned obj

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

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

        // YOUR CODE HERE
        var obj = {x: {a: 1}};
        expect(clone(obj)).to.have.property('a').but.not.own.property('a'); 
        //expect(clone(obj)).to.deep.equal(obj);
    });
});
clone.js
function clone (objectForCloning) {
    return Object.assign({}, objectForCloning)
}

module.exports.clone = clone

1 Answer

The test spec for finding if the properties of an object are same can be verified with the below piece of code.

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