content/base/test/test_bug422537.html

<!DOCTYPE HTML>
<html>
<!--
https://bugzilla.mozilla.org/show_bug.cgi?id=422537
-->
<head>
  <title>Test for bug 422537</title>
  <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>        
  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
</head>

<body>
<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=422537">Mozilla Bug 422537</a>
<p id="display"></p>
<div id="content" style="display: none">
  
</div>
<pre id="test">
<script class="testbody" type="text/javascript">

/** Test for Bug 422537 **/
var isupports_string = SpecialPowers.Cc["@mozilla.org/supports-string;1"]
                                    .createInstance(SpecialPowers.Ci.nsISupportsString);
isupports_string.data = "foo";

const url = "http://mochi.test:8888";
var body = [
  document,
  "foo",
  isupports_string
];

for (var i of body) {
  var xhr = new XMLHttpRequest();
  xhr.open("POST", url, true);
  if (i == isupports_string)
    SpecialPowers.wrap(xhr).send(i);
  else
    xhr.send(i);
  var chan = SpecialPowers.wrap(xhr).channel;
  if (!SpecialPowers.call_Instanceof(chan, SpecialPowers.Ci.nsIUploadChannel))
    throw "Must be an upload channel";
  var stream = chan.uploadStream;
  if (!stream || !SpecialPowers.call_Instanceof(stream, SpecialPowers.Ci.nsISeekableStream))
    throw "Stream must be seekable";
  // the following is a no-op, but should not throw an exception
  stream.seek(SpecialPowers.Ci.nsISeekableStream.NS_SEEK_CUR, 0);
}

ok(true, "xhr is seekable");

</script>
</pre>
</body>
</html>