Testing love

src/js/utils/custom-event.js

@@ -15,6 +15,7 @@ function canIuseNativeCustom() {
     return 't' === p.type && 'b' === p.detail.a;
   } catch (e) { }
 
+  /* istanbul ignore next: hard to reproduce on test environment  */
   return false;
 }
 
@@ -25,6 +26,7 @@ function canIuseNativeCustom() {
  * @return {Event}
  * @constructor
  */
+/* istanbul ignore next: hard to reproduce on test environment  */
 const IECustomEvent = function CustomEvent(type, params) {
   const e = document.createEvent('CustomEvent');
 
@@ -37,6 +39,7 @@ const IECustomEvent = function CustomEvent(type, params) {
   return e;
 };
 
+/* istanbul ignore next: hard to reproduce on test environment  */
 const WSCustomEvent = canIuseNativeCustom() ? NativeCustomEvent : IECustomEvent;
 
 export default WSCustomEvent;

test/utils/dom.test.js

@@ -191,6 +191,23 @@ describe('Show/hide', () => {
     DOM.hide(el);
     expect(el.style.display).toBe('none');
   });
+
+  test('Is visible', () => {
+    // offsetParent doesn't work nice with JSDom
+    const el = DOM.createNode('div');
+    let offsetParent = document.body;
+    el.style.display = 'block';
+
+    document.body.appendChild(el);
+    Object.defineProperty(el, 'offsetParent', {get: () => offsetParent});
+    expect(DOM.isVisible(el)).toBe(true);
+
+    DOM.hide(el);
+    offsetParent = null;
+
+    expect(DOM.isVisible(el)).toBe(false);
+    document.body.removeChild(el);
+  });
 });
 
 describe('Custom Event', () => {
@@ -229,7 +246,7 @@ describe('To Array', () => {
   });
 });
 
-describe('Focusble Element', () => {
+describe('Focusable Element', () => {
   beforeEach(() => {
     document.body.innerHTML = `      
       <p id="noContent" tabindex="0"></p>

test/utils/scroll-to.test.js

@@ -7,17 +7,52 @@ beforeAll(() => {
   document.body.innerHTML = `<div id="webslides">${brs}</div>`;
 });
 
-test('ScrollTo utility', () => {
+afterAll(() => {
+  jest.clearAllTimers();
+});
+
+test('ScrollTo with defaults', () => {
   const ws = document.getElementById('webslides');
-  const cb = jest.fn();
 
-  scrollTo(100, 500, cb);
+  scrollTo(100);
 
-  expect(cb).not.toBeCalled();
   expect(ws.scrollTop).toBe(0);
 
+  jest.runTimersToTime(400);
+
+  expect(ws.scrollTop).toBeLessThan(100);
+
   jest.runAllTimers();
 
-  expect(cb).toBeCalled();
   expect(ws.scrollTop).toBe(100);
 });
+
+test('ScrollTo with custom duration', () => {
+  const ws = document.getElementById('webslides');
+  ws.scrollTop = 0;
+  scrollTo(100, 2000);
+
+  expect(ws.scrollTop).toBe(0);
+  jest.runTimersToTime(500);
+  expect(ws.scrollTop).toBeLessThan(100);
+  jest.runTimersToTime(700);
+  expect(ws.scrollTop).toBeLessThan(100);
+  jest.runAllTimers();
+
+  expect(ws.scrollTop).toBe(100);
+});
+
+test('ScrollTo with custom callback', () => {
+  const ws = document.getElementById('webslides');
+  ws.scrollTop = 0;
+  const cb = jest.fn();
+
+  scrollTo(100, 500, cb);
+  expect(ws.scrollTop).toBe(0);
+  expect(cb).not.toBeCalled();
+
+  jest.runAllTimers();
+
+  expect(ws.scrollTop).toBe(100);
+  expect(cb).toBeCalled();
+});