LayoutTests/fetch/fetch-url-serialization.html

<!doctype html>
<html>
  <head>
    <meta charset="utf-8">
    <title>Request URL handling</title>
    <meta name="help" href="https://fetch.spec.whatwg.org/#request">
    <script src="../resources/testharness.js"></script>
    <script src="../resources/testharnessreport.js"></script>
    <base id="base">
  </head>
  <body>
    <script>
function executeTests(urls)
{
    for (url of urls) {
        if (url.input) {
            test(function() {
                document.getElementById("base").setAttribute("href", url.base);
                if (url.username || url.password || url.failure)
                    assert_throws_js(TypeError, function() {  new Request(url.input); });
                else {
                    var request = new Request(url.input);
                    assert_equals(request.url, url.href);
                }
            }, "Testing Request url '" + url.input + "' with base '" + url.base + "'");
         }
    }
}
    </script>
    <script src="fetch-urls.json"></script>
  </body>
</html>