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chromium/third_party/blink/web_tests/fast/forms/calendar-picker/calendar-picker-show-picker.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>
for (const inputType of ["date", "month", "week", "datetime-local", "time"]) {
    promise_test(async (t) => {
      const input = document.createElement("input");
      input.setAttribute("type", inputType);

      await test_driver.bless("show calendar picker");
      input.showPicker();
      assert_not_equals(internals.pagePopupWindow, null, "Picker is opened.");

      input.blur();
      assert_equals(internals.pagePopupWindow, null, "Picker is closed.");
    }, `Calendar picker: showPicker() for input[type="${inputType}""] should show picker`);
  }
</script>