Testing love

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();
+});