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chromium/third_party/blink/web_tests/fast/forms/calendar-picker/month-picker-touch-operations.html 

<!DOCTYPE html>
<meta name=fuzzy content="maxDifference=0-3; totalPixels=0-1000">
<link rel=help href="https://bugs.chromium.org/p/chromium/issues/detail?id=1321616">
<script src="../../../resources/testharness.js"></script>
<script src="../../../resources/testharnessreport.js"></script>
<script src="../../../resources/testdriver.js"></script>
<script src="../../../resources/testdriver-vendor.js"></script>
<script src="../resources/common.js"></script>
<script src="../resources/picker-common.js"></script>
<script src="resources/calendar-picker-common.js"></script>

<input type=month id=picker>

<script>
const forceRunAnimation = () => {
  internals.pagePopupWindow.AnimationManager.shared._animationFrameCallback(0);
}

promise_test(async () => {
  await openPicker(picker);

  const scrollView = internals.pagePopupWindow.global.picker.yearListView_.scrollView;
  const scrollViewOffset = cumulativeOffset(scrollView.element);

  eventSender.clearTouchPoints();
  eventSender.addTouchPoint(scrollViewOffset[0] + 1, scrollViewOffset[1] + 1);
  eventSender.touchStart();
  eventSender.updateTouchPoint(0, scrollViewOffset[0] + 1, scrollViewOffset[1] + 50);
  eventSender.touchMove();
  eventSender.releaseTouchPoint(0);
  eventSender.touchEnd();
  forceRunAnimation();

  const firstYearCell = internals.pagePopupWindow.global.picker.yearListView_.firstVisibleRow();
  assert_not_equals(firstYearCell, null);
}, `Verifies that the month picker should show year list`);

</script>