chromium/third_party/blink/web_tests/fast/forms/datetimelocal/datetimelocal-month-switcher-menu.html

<!DOCTYPE html>
<html>
<head>
<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>
</head>
<body>
<input type="datetime-local" id="datetime-local-0" value="2019-02-14T13:02">
<input type="datetime-local" id="datetime-local-1" value="2019-02-14T13:02">
<input type="datetime-local" id="datetime-local-2">
<script>

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

    clickMonthPopupButton();
    eventSender.keyDown('ArrowRight');
    eventSender.keyDown('ArrowDown');
    eventSender.keyDown('Enter');
    assert_equals(dateTimeElement.value, "2019-07-14T13:02", "Month chooser button should have changed month");

    clickDayCellAt(2, 3);
    assert_equals(dateTimeElement.value, "2019-07-23T13:02", "Clicking date should have changed date");

    eventSender.keyDown('Enter');
    assert_equals(internals.pagePopupWindow, null, "Enter key should dismiss popup.");
  });
}, "Datetimelocal picker: Month chooser should allow user to chooser month and push value to in-page control");

promise_test(() => {
  let dateTimeElement = document.getElementById('datetime-local-1');
  return openPicker(dateTimeElement)
  .then(() => {
    clickMonthPopupButton();
    eventSender.keyDown('ArrowRight');
    eventSender.keyDown('ArrowDown');
    eventSender.keyDown('Escape');
    clickDayCellAt(2, 3);

    assert_equals(dateTimeElement.value, "2019-02-19T13:02", "Escape key should have dismissed month chooser without changing month.");

    eventSender.keyDown('Enter');
    assert_equals(internals.pagePopupWindow, null, "Enter key should dismiss popup.");
  });
}, "Datetimelocal picker: Month chooser should dismiss on Escape key");

promise_test(() => {
  let dateTimeElement = document.getElementById('datetime-local-2');
  return openPicker(dateTimeElement)
  .then(() => {
    clickMonthPopupButton();
    eventSender.keyDown('Enter');

    let actualTodayDateString = new Date(dateTimeElement.value).toDateString();
    let expectedTodayDateString = new Date().toDateString();

    assert_equals(actualTodayDateString, expectedTodayDateString, "Opening month switcher should push value to in-page control if it has no initial value.");
    eventSender.keyDown('Escape');
    assert_equals(internals.pagePopupWindow, null, "Enter key should dismiss popup.");
  });
}, "Datetimelocal picker: Opening month chooser should push value to in-page control -- no initial value");

</script>
</body>
</html>