Question

Can anyone possibly tell me why the following test fails.

var Person = function() {};

Person.prototype.helloSomeone = function(toGreet) {
  return this.sayHello() + " " + toGreet;
};

Person.prototype.sayHello = function() {
  return "Hello";
};

describe("Person", function() {
 it("calls the sayHello() function", function() {
   var fakePerson = new Person();
   spyOn(fakePerson, "sayHello");
   fakePerson.helloSomeone("world");
   expect(fakePerson.sayHello).toHaveBeenCalled();
  });
});

I took it from here and he said it works. I can see the spyOn method is creating a wrapper function of the same name on the person object i.e. fakePerson.sayHello is being invoked on the object and not the prototype.

Many thanks

Answer 1

The tests failed because I was also using jasmine-sinon.js.