New test: scroll

test/utils/scroll.test.js

@@ -0,0 +1,65 @@
+import Scroll from '../../src/js/plugins/scroll';
+
+jest.useFakeTimers();
+
+// Copy of DOM.fireEvent, but using wheel deltas
+const fireEvent = (target, eventType, deltaX, deltaY) => {
+  const event = new CustomEvent(eventType);
+  event.deltaX = deltaX;
+  event.deltaY = deltaY;
+
+  target.dispatchEvent(event);
+};
+
+beforeAll(() => {
+  const brs = '<br />'.repeat(20);
+  document.body.innerHTML = `<div id="webslides">${brs}</div>`;
+});
+
+test('Scroll utility', () => {
+  // Forces mobile detection
+  window.navigator = {userAgent: 'Android'};
+  const ws = document.getElementById('webslides');
+  const next = jest.fn();
+  const prev = jest.fn();
+
+  let disabled = true;
+  const webslides = {
+    el: ws,
+    isDisabled: () => {return disabled;},
+    isMoving: false,
+    isVertical: false,
+    goNext: next,
+    goPrev: prev,
+    options: {
+      navigateOnScroll: true,
+      scrollWait: 200,
+      minWheelDelta: 50
+    }
+  };
+
+  const scroll = new Scroll(webslides);
+  fireEvent(ws, 'wheel', 300, 200);
+
+  expect(next).not.toBeCalled();
+  expect(prev).not.toBeCalled();
+
+  // Wait until next execution
+  jest.runTimersToTime(201);
+  expect(next.mock.calls.length).toBe(0);
+  expect(prev.mock.calls.length).toBe(0);
+
+  disabled = false;
+  fireEvent(ws, 'wheel', 300, 200);
+
+  jest.runTimersToTime(201);
+  expect(next.mock.calls.length).toBe(1);
+  expect(prev.mock.calls.length).toBe(0);
+
+  fireEvent(ws, 'wheel', -200, -300);
+
+  jest.runTimersToTime(201);
+  expect(next.mock.calls.length).toBe(1);
+  expect(prev.mock.calls.length).toBe(1);
+
+});