test: try mock Date.now to reduce test time

components/_util/__tests__/scrollTo.test.js

@@ -1,15 +1,38 @@
 import scrollTo from '../scrollTo';
-import { sleep } from '../../../tests/utils';
 
 describe('Test ScrollTo function', () => {
+  let dateNowMock;
+
+  beforeAll(() => {
+    jest.useFakeTimers();
+  });
+
+  afterAll(() => {
+    jest.useRealTimers();
+  });
+
+  beforeEach(() => {
+    dateNowMock = jest
+      .spyOn(Date, 'now')
+      .mockImplementationOnce(() => 0)
+      .mockImplementationOnce(() => 1000);
+  });
+
+  afterEach(() => {
+    dateNowMock.mockRestore();
+  });
+
   it('test scrollTo', async () => {
     const scrollToSpy = jest.spyOn(window, 'scrollTo').mockImplementation((x, y) => {
       window.scrollY = y;
       window.pageYOffset = y;
     });
+
     scrollTo(1000);
-    await sleep(500);
+
+    jest.runAllTimers();
     expect(window.pageYOffset).toBe(1000);
+
     scrollToSpy.mockRestore();
   });
 
@@ -18,7 +41,7 @@ describe('Test ScrollTo function', () => {
     scrollTo(1000, {
       callback: cbMock,
     });
-    await sleep(500);
+    jest.runAllTimers();
     expect(cbMock).toHaveBeenCalledTimes(1);
   });
 
@@ -27,7 +50,7 @@ describe('Test ScrollTo function', () => {
     scrollTo(1000, {
       getContainer: () => div,
     });
-    await sleep(500);
+    jest.runAllTimers();
     expect(div.scrollTop).toBe(1000);
   });
 });