The "bare" spy

To understand the concept of behavior checking, let's revisit an example presented in Chapter 3, Testing Frontend Code, and test the observable behavior of the NewInvestmentView test suite:

 describe("NewInvestmentView", function() {
  var view;

  // setup and other specs ...

  describe("with its inputs correctly filled", function() {

    // setup and other specs ...

    describe("and when an investment is created", function() {
      var callbackSpy;
      var investment;

      beforeEach(function() {
        callbackSpy = jasmine.createSpy('callback');
        view.onCreate(callbackSpy);

        investment = view.create();
      });

      it("should invoke the 'onCreate' callback with the created investment", function() {

        expect(callbackSpy).toHaveBeenCalled();
        expect(callbackSpy).toHaveBeenCalledWith(investment);
      });
    });
  });
});

During the spec setup, it creates...