Jasmine Any Matcher

hash-member-any-matcher.js

describe("testing a Backbone fetch", function () {
  beforeEach(function () {
    spyOn($, 'ajax');
  });

  it("should have been called with this", function () {    
    var sut = new MyModel({});
    sut.fetch();
    var ajaxOptions = { type: 'GET', dataType: 'json', success: undefined, error: jasmine.any(Function), url: '/MyModel' };

    expect($.ajax).toHaveBeenCalledWith(ajaxOptions);
  });
});