Trying to understand Jasmine's toHaveBeenCalled() matcher

Question

I am new to jasmine here is my src file in which i create Auth class

function Auth() {
}

Auth.prototype.isEmpty = function(str) {
    return (!str || 0 === str.length);
}

Auth.prototype.Login = function (username , password) {
    if (this.isEmpty(username) || this.isEmpty(password)) {
        return "Username or Password cann't be blank ";
    }
    else {
        return "Logged In !";
    }
}

now i want to test jasmine's toHaveBeenCalled() matcher . Here is what i write

it("should be able to Login", function () {
    spyOn(authobj);
    expect(authobj.Login('abc', 'abc')).toHaveBeenCalled();
});

but it says that undefined() method does not exist

Answer 1

EDIT: Look at basecode answer for a better approach

---

From the docs, you should use it like the following:

spyOn(foo, 'setBar');

it("tracks that the spy was called", function() {
  expect(foo.setBar).toHaveBeenCalled();
});

So you should write:

it("should be able to Login", function () {
  spyOn(authobj, 'isEmpty');  
  authobj.Login('abc', 'abc');  
  expect(authobj.isEmpty).toHaveBeenCalled();
});