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describe('Smooth Scroll', function () {
//
// Helper Methods
//
/**
* Create a link element, add it to the body.
* @public
* @param {String} the href attribute of the new link
* @param {Boolean} whether to add data-scroll to the link or not
* @returns {Element}
*/
var injectElem = function (href, smooth) {
var elt = document.createElement('a');
elt.href = href;
if (smooth) {
elt.setAttribute('data-scroll', true);
}
document.body.appendChild(elt);
return elt;
};
/**
* Simulate a click event.
* @public
* @param {Element} the element to simulate a click on
*/
var simulateClick = function (elt) {
var click = document.createEvent('MouseEvents');
click.initMouseEvent('click', true, true, window, 1, 0, 0, 0, 0, false, false, false, false, 0, null);
elt.dispatchEvent(click);
};
// A pattern for settings to validate their format.
var settingsStub = {
speed: jasmine.any(Number),
easing: jasmine.any(String),
offset: jasmine.any(Number),
updateURL: jasmine.any(Boolean),
callback: jasmine.any(Function)
};
//
// Init
//
describe('Should initialize plugin', function () {
it('Should export the smoothScroll module', function () {
expect(smoothScroll).toBeDefined();
});
it('Should expose public functions', function () {
expect(smoothScroll.init).toEqual(jasmine.any(Function));
expect(smoothScroll.destroy).toEqual(jasmine.any(Function));
expect(smoothScroll.animateScroll).toEqual(jasmine.any(Function));
});
it('Should add event listeners', function () {
spyOn(document, 'addEventListener');
smoothScroll.init();
expect(document.addEventListener).toHaveBeenCalledWith('click', jasmine.any(Function), false);
spyOn(document, 'removeEventListener');
smoothScroll.destroy();
expect(document.removeEventListener).toHaveBeenCalledWith('click', jasmine.any(Function), false);
});
});
//
// Events
//
describe('Should animate scroll when anchor clicked', function () {
var elt = injectElem('#anchor', true);
document.body.setAttribute('id', 'anchor');
afterEach(function () {
smoothScroll.destroy();
});
it('Should trigger smooth scrolling on click', function () {
spyOn(smoothScroll, 'animateScroll');
smoothScroll.init();
simulateClick(elt);
expect(smoothScroll.animateScroll).toHaveBeenCalledWith(elt, '#anchor', jasmine.objectContaining(settingsStub));
});
it('Should do nothing if not initialized', function () {
spyOn(smoothScroll, 'animateScroll');
simulateClick(elt);
expect(smoothScroll.animateScroll).not.toHaveBeenCalled();
});
it('Should do nothing if destroyed', function () {
spyOn(smoothScroll, 'animateScroll');
smoothScroll.init();
smoothScroll.destroy();
simulateClick(elt);
expect(smoothScroll.animateScroll).not.toHaveBeenCalled();
});
});
describe('Should run callbacks', function () {
var elt = injectElem('#anchor', true);
document.body.setAttribute('id', 'anchor');
// Generates a callback to test asynchronous calls.
var callback = function (eltVal, anchorVal, done) {
return function (toggle, anchor) {
expect(toggle).toBe(eltVal);
expect(anchor).toBe(anchorVal);
done();
};
};
afterEach(function () {
smoothScroll.destroy();
});
it('Should run callback', function (done) {
var settings = {
callback: callback(elt, '#anchor', done)
};
smoothScroll.init(settings);
simulateClick(elt);
});
});
});
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