Cyclic Reference Example

package.json

{
  "name": "cyclic-reference-example",
  "version": "1.0.0",
  "description": "Example of the cyclic reference example",
  "main": "index.js",
  "scripts": {
    "test": "mocha test"
  },
  "author": "bohac.v@gmail.com",
  "license": "MIT",
  "dependencies": {
    "chai": "^1.10.0",
    "mocha": "^2.0.1"
  }
}

test.js

var assert = require("chai").assert,

    createCyclicReference = function (name, place) {
        var customer = { name: name };
        var address = { name: place };

        customer.address = address;
        address.customer = customer;

        return customer;
    };

describe('assert', function () {
    describe('#deepEqual()', function () {
        it('should handle cyclic references', function () {
            var actual = createCyclicReference('Harry Potter', 'Diagon Alley'),
                expected = createCyclicReference('Harry Potter', 'Diagon Alley');

            assert.deepEqual(actual, expected, 'Given objects are not deep equal.');
        });
    });

    describe('#notDeepEqual()', function() {
        it('should handle cyclic references', function () {
            var actual = createCyclicReference('Harry Potter', 'Diagon Alley'),
                expected = createCyclicReference('Hermione Granger', 'Diagon Alley');

            assert.notDeepEqual(actual, expected, 'Given objects are not deep equal.');
        });
    });
});