Category: Software Development

Sinon spies Spies on sinon are redirected functions that will notify of any call to them. Let's see an example: [sourcecode language="js" wraplines="false"] var myGreatObject = { myAwesomeMethod: function () { console.log(1); //do something } }; it('test spies', function () { myGreatObject.myAwesomeMethod(); // 1 //Now let's reconvert it into an spy: myGreatObject.myAwesomeMethod = sinon.spy(); console.log(myGreatObject.myAwesomeMethod.called); // false myGreatObject.myAwesomeMethod(); console.log(myGreatObject.myAwesomeMethod.called); // true console.log(myGreatObject.myAwesomeMethod.callCount); // 1 myGreatObject.myAwesomeMethod(); myGreatObject.myAwesomeMethod(); console.log(myGreatObject.myAwesomeMethod.callCount); // 3 }); [/sourcecode] I think that's a good example of how spies work in Mocha+Sinon. We have an object and we can make use of it, as usual. We then redirect the object's method to an spy, this is, the method "myAwesomeMethod" is actually a pointer, so we point to a different function, that's all. If we check if the spy has…