<html>
<link rel="import" href="../resources/chai.html" />
<link rel="import" href="../resources/mocha.html" />
<script>
describe('Non-relevant properties on mutation records should be null, except for NodeLists, which should be empty', function() {

  var observer = new MutationObserver(function() {});

  it('on characterData records', function() {
    var text = document.createTextNode('something');
    observer.observe(text, {characterData: true});
    text.data = 'something else';
    var record = observer.takeRecords()[0];
    assert.isNull(record.attributeName);
    assert.isNull(record.oldValue);
    assert.isNull(record.previousSibling);
    assert.isNull(record.nextSibling);
    assert.equal(record.addedNodes.length, 0);
    assert.equal(record.removedNodes.length, 0);
  });
  it('on childList records', function() {
    var div = document.createElement('div');
    observer.observe(div, {childList: true});
    div.appendChild(document.createElement('span'));
    record = observer.takeRecords()[0];
    assert.isNull(record.attributeName);
    assert.isNull(record.oldValue);
  });
  it('on attribute records', function() {
    var div = document.createElement('div');
    observer.observe(div, {attributes: true});
    div.setAttribute('data-foo', 'bar');
    record = observer.takeRecords()[0];
    assert.isNull(record.oldValue);
    assert.isNull(record.previousSibling);
    assert.isNull(record.nextSibling);
    assert.equal(record.addedNodes.length, 0);
    assert.equal(record.removedNodes.length, 0);
  });
});
</script>
</html>