message: chore(CountDown): test cases may fail
diff: @@ -9,7 +9,7 @@ test('macro task finish event', async () => {
  });
  expect(wrapper.emitted('finish')).toBeFalsy();
  - await later(20);
  + await later(50);
  expect(wrapper.emitted('finish')).toBeTruthy();
  });
  @@ -22,7 +22,7 @@ test('micro task finish event', async () => {
  });
  expect(wrapper.emitted('finish')).toBeFalsy();
  - await later(20);
  + await later(50);
  expect(wrapper.emitted('finish')).toBeTruthy();
  });
  @@ -35,7 +35,7 @@ test('macro task re-render', async () => {
  });
  const prevSnapShot = wrapper.html();
  - await later(20);
  + await later(50);
  const laterSnapShot = wrapper.html();
  expect(prevSnapShot !== laterSnapShot).toBeTruthy();
  @@ -51,7 +51,7 @@ test('micro task re-render', async () => {
  });
  const prevSnapShot = wrapper.html();
  - await later(20);
  + await later(50);
  const laterSnapShot = wrapper.html();
  expect(prevSnapShot !== laterSnapShot).toBeTruthy();
  @@ -66,7 +66,7 @@ test('disable auto-start prop', async () => {
  }
  });
  - await later(20);
  + await later(50);
  expect(wrapper).toMatchSnapshot();
  });
  @@ -103,7 +103,7 @@ test('pause method', async () => {
  const prevSnapShot = wrapper.html();
  wrapper.vm.pause();
  - await later(20);
  + await later(50);
  const laterShapShot = wrapper.html();
  expect(prevSnapShot === laterShapShot).toBeTruthy();
  @@ -119,7 +119,7 @@ test('reset method', async () => {
  });
  const prevSnapShot = wrapper.html();
  - await later(20);
  + await later(50);
  wrapper.vm.reset();
  const laterShapShot = wrapper.html();
  