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diff --git a/tools/addon-sdk-1.4/packages/api-utils/tests/test-byte-streams.js b/tools/addon-sdk-1.4/packages/api-utils/tests/test-byte-streams.js
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+/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim:set ts=2 sw=2 sts=2 et filetype=javascript
+ * ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Jetpack.
+ *
+ * The Initial Developer of the Original Code is
+ * the Mozilla Foundation.
+ * Portions created by the Initial Developer are Copyright (C) 2010
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   Drew Willcoxon <adw@mozilla.com> (Original Author)
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+const byteStreams = require("byte-streams");
+const file = require("file");
+const url = require("url");
+const { Loader } = require("./helpers");
+
+const STREAM_CLOSED_ERROR = "The stream is closed and cannot be used.";
+
+// This should match the constant of the same name in byte-streams.js.
+const BUFFER_BYTE_LEN = 0x8000;
+
+exports.testWriteRead = function (test) {
+  let fname = dataFileFilename();
+
+  // Write a small string less than the stream's buffer size...
+  let str = "exports.testWriteRead data!";
+  let stream = open(test, fname, true);
+  test.assert(!stream.closed, "stream.closed after open should be false");
+  stream.write(str);
+  stream.close();
+  test.assert(stream.closed, "Stream should be closed after stream.close");
+  test.assertRaises(function () stream.write("This shouldn't be written!"),
+                    STREAM_CLOSED_ERROR,
+                    "stream.write after close should raise error");
+
+  // ... and read it.
+  stream = open(test, fname);
+  test.assertEqual(stream.read(), str,
+                   "stream.read should return string written");
+  test.assertEqual(stream.read(), "",
+                   "stream.read at EOS should return empty string");
+  stream.close();
+  test.assert(stream.closed, "Stream should be closed after stream.close");
+  test.assertRaises(function () stream.read(),
+                    STREAM_CLOSED_ERROR,
+                    "stream.read after close should raise error");
+
+  file.remove(fname);
+};
+
+// Write a big string many times the size of the stream's buffer and read it.
+exports.testWriteReadBig = function (test) {
+  let str = "";
+  let bufLen = BUFFER_BYTE_LEN;
+  let fileSize = bufLen * 10;
+  for (let i = 0; i < fileSize; i++)
+    str += i % 10;
+  let fname = dataFileFilename();
+  let stream = open(test, fname, true);
+  stream.write(str);
+  stream.close();
+  stream = open(test, fname);
+  test.assertEqual(stream.read(), str,
+                   "stream.read should return string written");
+  stream.close();
+  file.remove(fname);
+};
+
+// The same, but write and read in chunks.
+exports.testWriteReadChunks = function (test) {
+  let str = "";
+  let bufLen = BUFFER_BYTE_LEN;
+  let fileSize = bufLen * 10;
+  for (let i = 0; i < fileSize; i++)
+    str += i % 10;
+  let fname = dataFileFilename();
+  let stream = open(test, fname, true);
+  let i = 0;
+  while (i < str.length) {
+    // Use a chunk length that spans buffers.
+    let chunk = str.substr(i, bufLen + 1);
+    stream.write(chunk);
+    i += bufLen + 1;
+  }
+  stream.close();
+  stream = open(test, fname);
+  let readStr = "";
+  bufLen = BUFFER_BYTE_LEN;
+  let readLen = bufLen + 1;
+  do {
+    var frag = stream.read(readLen);
+    readStr += frag;
+  } while (frag);
+  stream.close();
+  test.assertEqual(readStr, str,
+                   "stream.write and read in chunks should work as expected");
+  file.remove(fname);
+};
+
+exports.testReadLengths = function (test) {
+  let fname = dataFileFilename();
+  let str = "exports.testReadLengths data!";
+  let stream = open(test, fname, true);
+  stream.write(str);
+  stream.close();
+
+  stream = open(test, fname);
+  test.assertEqual(stream.read(str.length * 1000), str,
+                   "stream.read with big byte length should return string " +
+                   "written");
+  stream.close();
+
+  stream = open(test, fname);
+  test.assertEqual(stream.read(0), "",
+                   "string.read with zero byte length should return empty " +
+                   "string");
+  stream.close();
+
+  stream = open(test, fname);
+  test.assertEqual(stream.read(-1), "",
+                   "string.read with negative byte length should return " +
+                   "empty string");
+  stream.close();
+
+  file.remove(fname);
+};
+
+exports.testTruncate = function (test) {
+  let fname = dataFileFilename();
+  let str = "exports.testReadLengths data!";
+  let stream = open(test, fname, true);
+  stream.write(str);
+  stream.close();
+
+  stream = open(test, fname);
+  test.assertEqual(stream.read(), str,
+                   "stream.read should return string written");
+  stream.close();
+
+  stream = open(test, fname, true);
+  stream.close();
+
+  stream = open(test, fname);
+  test.assertEqual(stream.read(), "",
+                   "stream.read after truncate should be empty");
+  stream.close();
+
+  file.remove(fname);
+};
+
+exports.testUnload = function (test) {
+  let loader = Loader(module);
+  let file = loader.require("file");
+
+  let filename = url.toFilename(module.uri);
+  let stream = file.open(filename, "b");
+
+  loader.unload();
+  test.assert(stream.closed, "Stream should be closed after module unload");
+};
+
+// Returns the name of a file that should be used to test writing and reading.
+function dataFileFilename() {
+  let dir = file.dirname(url.toFilename(module.uri));
+  return file.join(dir, "test-byte-streams-data");
+}
+
+// Opens and returns the given file and ensures it's of the correct class.
+function open(test, filename, forWriting) {
+  let stream = file.open(filename, forWriting ? "wb" : "b");
+  let klass = forWriting ? "ByteWriter" : "ByteReader";
+  test.assert(stream instanceof byteStreams[klass],
+              "Opened stream should be a " + klass);
+  return stream;
+}