<!DOCTYPE html>
<script src='/resources/testharness.js'></script>
<script src='/resources/testharnessreport.js'></script>
<body>
<script>
[document, new XPathEvaluator()].forEach(evaluator => {
  test(() => {
    assert_equals(evaluator.createNSResolver(document), document, 'Document');
    const fragment = document.createDocumentFragment();
    assert_equals(evaluator.createNSResolver(fragment), fragment,
                  'DocumentFragment');
    assert_equals(evaluator.createNSResolver(document.doctype),
                  document.doctype, 'DocumentType');
    assert_equals(evaluator.createNSResolver(document.body), document.body,
                  'Element');
    assert_equals(evaluator.createNSResolver(document.body.firstChild),
                  document.body.firstChild, 'Text');
    const attr = document.createAttribute('foo');
    assert_equals(evaluator.createNSResolver(attr), attr, 'Attr');
  }, `createNSResolver() should return the specified node as is. (${evaluator.constructor.name})`);

  function createAndLookup(evaluator, node) {
    return evaluator.createNSResolver(node).lookupNamespaceURI('xml');
  }

  test(() => {
    assert_equals(createAndLookup(evaluator, new Document()), null, 'Document');
    assert_equals(createAndLookup(evaluator, new DocumentFragment()), null,
                  'DocumentFragment');
    assert_equals(createAndLookup(evaluator, document.doctype), null,
                  'DocumentType');
    assert_equals(createAndLookup(evaluator, document.createElement('body')),
                  'http://www.w3.org/XML/1998/namespace', 'Element');
    assert_equals(createAndLookup(evaluator, document.createTextNode('foo')),
                  null, 'Text');
    assert_equals(createAndLookup(evaluator, document.createAttribute('bar')),
                  null, 'Attr');
  }, `createNSResolver() resultant object should not add support of 'xml' prefix. (${evaluator.constructor.name})`);
});
</script>
</body>
