chromium/third_party/blink/web_tests/fast/forms/week/week-picker-month-switcher-buttons.html

<!DOCTYPE html>
<meta name=fuzzy content="maxDifference=0-3; totalPixels=0-1000">
<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="../calendar-picker/resources/calendar-picker-common.js"></script>

<input type="week" id="week-0" value="2019-W33">
<input type="week" id="week-1" value="2019-W37">
<input type="week" id="week-2" value="2019-W30">
<input type="week" id="week-3" value="2019-W52">
<script>

promise_test(() => {
  let weekElement = document.getElementById('week-0');
  return openPicker(weekElement)
  .then(() => {
    // Make the picker dismiss synchronously so we don't need to insert
    // an artificial delay in the test
    internals.pagePopupWindow.CalendarPicker.commitDelayMs = 0;

    clickNextMonthButton();
    assert_equals(weekElement.value, "2019-W37", "Month chooser button should have changed month");

    clickDayCellAt(1, 2);
    assert_equals(weekElement.value, "2019-W38", "Clicking week should have changed week");
    assert_equals(internals.pagePopupWindow, null, "Clicking week should have dismissed popup");
  });
}, "Week picker: Next month button should advance to next month and change selection to same week in that month when doing so.");

promise_test(() => {
  let weekElement = document.getElementById('week-1');
  return openPicker(weekElement)
  .then(() => {
    // Make the picker dismiss synchronously so we don't need to insert
    // an artificial delay in the test
    internals.pagePopupWindow.CalendarPicker.commitDelayMs = 0;

    clickPrevMonthButton();
    assert_equals(weekElement.value, "2019-W33", "Selection should have been clipped when moving into shorter month");

    clickDayCellAt(1, 1);
    assert_equals(weekElement.value, "2019-W32", "Clicking week should have changed week");
    assert_equals(internals.pagePopupWindow, null, "Clicking week should have dismissed popup");
  });
}, "Week picker: Prev month button should advance to previous month and change selection to same week in that month when doing so.");

promise_test(() => {
  let weekElement = document.getElementById('week-2');
  return openPicker(weekElement)
  .then(() => {
    // Make the picker dismiss synchronously so we don't need to insert
    // an artificial delay in the test
    internals.pagePopupWindow.CalendarPicker.commitDelayMs = 0;

    // Arrow down to week 5 (if we started the control there, it would just open to the
    // following month).
    eventSender.keyDown('ArrowDown');
    assert_equals(weekElement.value, "2019-W31", "Arrow key should have changed week");

    clickNextMonthButton();
    assert_equals(weekElement.value, "2019-W35", "Selection should have been clipped when moving into shorter month");

    clickDayCellAt(1, 3);
    assert_equals(weekElement.value, "2019-W34", "Clicking week should have changed week");
    assert_equals(internals.pagePopupWindow, null, "Clicking week should have dismissed popup");
  });
}, "Week picker: Next month button should clip week if next month has fewer weeks");

promise_test(() => {
  let weekElement = document.getElementById('week-3');
  return openPicker(weekElement)
  .then(() => {
    // Make the picker dismiss synchronously so we don't need to insert
    // an artificial delay in the test
    internals.pagePopupWindow.CalendarPicker.commitDelayMs = 0;

    // Arrow down to week 5 (if we started the control there, it would just open to the
    // following month).
    eventSender.keyDown('ArrowDown');
    assert_equals(weekElement.value, "2020-W01", "Arrow key should have changed week");

    clickPrevMonthButton();
    assert_equals(weekElement.value, "2019-W48", "Selection should have been clipped when moving into shorter month");

    clickDayCellAt(1, 3);
    assert_equals(weekElement.value, "2019-W47", "Clicking week should have changed week");
    assert_equals(internals.pagePopupWindow, null, "Clicking week should have dismissed popup");
  });
}, "Week picker: Previous month button should clip week if prev month has fewer days");

</script>