How to test XMLHttpRequest with Jasmine

Question

How can I test the onreadystatechange on XMLHttpRequest or pure Javascript AJAX without jQuery? I\'m doing this because I\'m developing Firefox extension. I guess I have to use

Answer 1

You can test it in such manner

it("should make XHR request", function() {

   // arrange

    var xhr = {
        open: jasmine.createSpy('open')
    };

    XMLHttpRequest = jasmine.createSpy('XMLHttpRequest');
    XMLHttpRequest.and.callFake(function () {
        return xhr;
    });

    // act

    submit();

    // assert

    expect(xhr.open).toHaveBeenCalled(); 
});