<!DOCTYPE html>
<script src='../resources/testharness.js'></script>
<script src='../resources/testharnessreport.js'></script>
<script src='resources/shadow-dom.js'></script>
<!-- This is a micro benchmark to catch an unintentional regression.
     If the reason of a regression is clear, it is okay.
     We do not have to optimize the result of the benchmark. -->
<div id='d1'>
  <template data-mode='open' data-expose-as='d1_shadow'>
    <slot name='d1-s1'></slot>
  </template>
  <div id='d2' slot='d1-s1'></div>
</div>
<script>
'use strict';
convertTemplatesToShadowRootsWithin(d1);
removeWhiteSpaceOnlyTextNodes(d1);

async_test((test) => {

  const d1_s1 = d1_shadow.querySelector('slot');

  assert_array_equals(d1_s1.assignedNodes(), [d2]);
  assert_array_equals(d1_s1.assignedNodes({'flatten': true}), [d2]);

  d1_s1.addEventListener('slotchange', (e) => {
    test.step(() => {
      assert_equals(e.target, d1_s1);
      assert_array_equals(d1_s1.assignedNodes(), []);
      assert_array_equals(d1_s1.assignedNodes({'flatten': true}), []);
      test.done();
    });
  });

  d2.setAttribute('slot', 'non-exist');
}, "slotchange event caused by renaming slot name");
</script>