[Jasmine] Spies

Spies

- We want to be able to check if functions have been called so We use it Spies

- It lets you spy on pieces of your program

1. spyOn()

1_1 src

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

1_2. spec

describe("Hello" , function(){ it("say", function(){ expect(helloWorld()).toEqual("Hello World"); }); it("The 'toMatch' matcher is for regular expressions", function() { var message = "foo bar baz"; expect(message).toMatch(/bar/); expect(message).toMatch("bar"); expect(message).not.toMatch(/quux/); }); }); describe("Person", function() { it("calls the sayHello() function", function() { var fakePerson = new Person(); spyOn(fakePerson, "sayHello"); fakePerson.helloSomeone("world"); expect(fakePerson.sayHello).toHaveBeenCalled(); }); });  

- This will spy on this fake person's sayHello() method.