sinon.js spy usage

sinon_spy.js

'use strict';

var sinon  = require('sinon');
var assert = require('assert');

var testObject = {
  'testMethod': function () {

    return 'testtest';
  }
};

describe('sinon spy usage, our testMethod', function () {

  var spyTestObject;

  it('returns "testtest" normally', function () {

    assert.equal(testObject.testMethod(), 'testtest');
  });

  it('returns "3" after 3 times call', function () {

    spyTestObject = sinon.spy(testObject, 'testMethod');

    testObject.testMethod();
    testObject.testMethod();
    testObject.testMethod();

    assert.equal(testObject.testMethod.callCount, 3);
  });

  it('returns "undefined" after restoring original state', function () {

    spyTestObject.restore();

    testObject.testMethod();

    assert.equal(testObject.testMethod.callCount, undefined);
  });
});