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diff --git a/tools/addon-sdk-1.5/packages/api-utils/tests/test-file.js b/tools/addon-sdk-1.5/packages/api-utils/tests/test-file.js
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+++ b/tools/addon-sdk-1.5/packages/api-utils/tests/test-file.js
@@ -0,0 +1,273 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+const { pathFor } = require('api-utils/system');
+const file = require("api-utils/file");
+const url = require("api-utils/url");
+
+const byteStreams = require("api-utils/byte-streams");
+const textStreams = require("api-utils/text-streams");
+
+const ERRORS = {
+  FILE_NOT_FOUND: /^path does not exist: .+$/,
+  NOT_A_DIRECTORY: /^path is not a directory: .+$/,
+  NOT_A_FILE: /^path is not a file: .+$/,
+};
+
+// Use profile directory to list / read / write files.
+const profilePath = pathFor('ProfD');
+const fileNameInProfile = 'compatibility.ini';
+const dirNameInProfile = 'extensions';
+const filePathInProfile = file.join(profilePath, fileNameInProfile);
+const dirPathInProfile = file.join(profilePath, dirNameInProfile);
+
+exports.testDirName = function(test) {
+  test.assertEqual(file.dirname(dirPathInProfile), profilePath,
+                   "file.dirname() of dir should return parent dir");
+
+  test.assertEqual(file.dirname(filePathInProfile), profilePath,
+                   "file.dirname() of file should return its dir");
+
+  let dir = profilePath;
+  while (dir)
+    dir = file.dirname(dir);
+
+  test.assertEqual(dir, "",
+                   "dirname should return empty string when dir has no parent");
+};
+
+exports.testBasename = function(test) {
+  // Get the top-most path -- the path with no basename.  E.g., on Unix-like
+  // systems this will be /.  We'll use it below to build up some test paths.
+  // We have to go to this trouble because file.join() needs a legal path as a
+  // base case; join("foo", "bar") doesn't work unfortunately.
+  let topPath = profilePath;
+  let parentPath = file.dirname(topPath);
+  while (parentPath) {
+    topPath = parentPath;
+    parentPath = file.dirname(topPath);
+  }
+
+  let path = topPath;
+  test.assertEqual(file.basename(path), "",
+                   "basename should work on paths with no components");
+
+  path = file.join(path, "foo");
+  test.assertEqual(file.basename(path), "foo",
+                   "basename should work on paths with a single component");
+
+  path = file.join(path, "bar");
+  test.assertEqual(file.basename(path), "bar",
+                   "basename should work on paths with multiple components");
+};
+
+exports.testList = function(test) {
+  let list = file.list(profilePath);
+  let found = [ true for each (name in list)
+                    if (name === fileNameInProfile) ];
+
+  if (found.length > 1)
+    test.fail("a dir can't contain two files of the same name!");
+  test.assertEqual(found[0], true, "file.list() should work");
+
+  test.assertRaises(function() {
+    file.list(filePathInProfile);
+  }, ERRORS.NOT_A_DIRECTORY, "file.list() on non-dir should raise error");
+
+  test.assertRaises(function() {
+    file.list(file.join(dirPathInProfile, "does-not-exist"));
+  }, ERRORS.FILE_NOT_FOUND, "file.list() on nonexistent should raise error");
+};
+
+exports.testRead = function(test) {
+  let contents = file.read(filePathInProfile);
+  test.assertMatches(contents, /Compatibility/,
+                     "file.read() should work");
+
+  test.assertRaises(function() {
+    file.read(file.join(dirPathInProfile, "does-not-exists"));
+  }, ERRORS.FILE_NOT_FOUND, "file.read() on nonexistent file should throw");
+
+  test.assertRaises(function() {
+    file.read(dirPathInProfile);
+  }, ERRORS.NOT_A_FILE, "file.read() on dir should throw");
+};
+
+exports.testJoin = function(test) {
+  let baseDir = file.dirname(filePathInProfile);
+
+  test.assertEqual(file.join(baseDir, fileNameInProfile),
+                   filePathInProfile, "file.join() should work");
+};
+
+exports.testOpenNonexistentForRead = function (test) {
+  var filename = file.join(profilePath, 'does-not-exists');
+  test.assertRaises(function() {
+    file.open(filename);
+  }, ERRORS.FILE_NOT_FOUND, "file.open() on nonexistent file should throw");
+
+  test.assertRaises(function() {
+    file.open(filename, "r");
+  }, ERRORS.FILE_NOT_FOUND, "file.open('r') on nonexistent file should throw");
+
+  test.assertRaises(function() {
+    file.open(filename, "zz");
+  }, ERRORS.FILE_NOT_FOUND, "file.open('zz') on nonexistent file should throw");
+};
+
+exports.testOpenNonexistentForWrite = function (test) {
+  let filename = file.join(profilePath, 'open.txt');
+
+  let stream = file.open(filename, "w");
+  stream.close();
+
+  test.assert(file.exists(filename),
+              "file.exists() should return true after file.open('w')");
+  file.remove(filename);
+  test.assert(!file.exists(filename),
+              "file.exists() should return false after file.remove()");
+
+  stream = file.open(filename, "rw");
+  stream.close();
+
+  test.assert(file.exists(filename),
+              "file.exists() should return true after file.open('rw')");
+  file.remove(filename);
+  test.assert(!file.exists(filename),
+              "file.exists() should return false after file.remove()");
+};
+
+exports.testOpenDirectory = function (test) {
+  let dir = dirPathInProfile;
+  test.assertRaises(function() {
+    file.open(dir);
+  }, ERRORS.NOT_A_FILE, "file.open() on directory should throw");
+
+  test.assertRaises(function() {
+    file.open(dir, "w");
+  }, ERRORS.NOT_A_FILE, "file.open('w') on directory should throw");
+};
+
+exports.testOpenTypes = function (test) {
+  let filename = file.join(profilePath, 'open-types.txt');
+
+
+  // Do the opens first to create the data file.
+  var stream = file.open(filename, "w");
+  test.assert(stream instanceof textStreams.TextWriter,
+              "open(w) should return a TextWriter");
+  stream.close();
+
+  stream = file.open(filename, "wb");
+  test.assert(stream instanceof byteStreams.ByteWriter,
+              "open(wb) should return a ByteWriter");
+  stream.close();
+
+  stream = file.open(filename);
+  test.assert(stream instanceof textStreams.TextReader,
+              "open() should return a TextReader");
+  stream.close();
+
+  stream = file.open(filename, "r");
+  test.assert(stream instanceof textStreams.TextReader,
+              "open(r) should return a TextReader");
+  stream.close();
+
+  stream = file.open(filename, "b");
+  test.assert(stream instanceof byteStreams.ByteReader,
+              "open(b) should return a ByteReader");
+  stream.close();
+
+  stream = file.open(filename, "rb");
+  test.assert(stream instanceof byteStreams.ByteReader,
+              "open(rb) should return a ByteReader");
+  stream.close();
+
+  file.remove(filename);
+};
+
+exports.testMkpathRmdir = function (test) {
+  let basePath = profilePath;
+  let dirs = [];
+  for (let i = 0; i < 3; i++)
+    dirs.push("test-file-dir");
+
+  let paths = [];
+  for (let i = 0; i < dirs.length; i++) {
+    let args = [basePath].concat(dirs.slice(0, i + 1));
+    paths.unshift(file.join.apply(null, args));
+  }
+
+  for (let i = 0; i < paths.length; i++) {
+    test.assert(!file.exists(paths[i]),
+                "Sanity check: path should not exist: " + paths[i]);
+  }
+
+  file.mkpath(paths[0]);
+  test.assert(file.exists(paths[0]), "mkpath should create path: " + paths[0]);
+
+  for (let i = 0; i < paths.length; i++) {
+    file.rmdir(paths[i]);
+    test.assert(!file.exists(paths[i]),
+                "rmdir should remove path: " + paths[i]);
+  }
+};
+
+exports.testMkpathTwice = function (test) {
+  let dir = profilePath;
+  let path = file.join(dir, "test-file-dir");
+  test.assert(!file.exists(path),
+              "Sanity check: path should not exist: " + path);
+  file.mkpath(path);
+  test.assert(file.exists(path), "mkpath should create path: " + path);
+  file.mkpath(path);
+  test.assert(file.exists(path),
+              "After second mkpath, path should still exist: " + path);
+  file.rmdir(path);
+  test.assert(!file.exists(path), "rmdir should remove path: " + path);
+};
+
+exports.testMkpathExistingNondirectory = function (test) {
+  var fname = file.join(profilePath, 'conflict.txt');
+  file.open(fname, "w").close();
+  test.assert(file.exists(fname), "File should exist");
+  test.assertRaises(function() file.mkpath(fname),
+                    /^The path already exists and is not a directory: .+$/,
+                    "mkpath on file should raise error");
+  file.remove(fname);
+};
+
+exports.testRmdirNondirectory = function (test) {
+  var fname = file.join(profilePath, 'not-a-dir')
+  file.open(fname, "w").close();
+  test.assert(file.exists(fname), "File should exist");
+  test.assertRaises(function() {
+    file.rmdir(fname);
+  }, ERRORS.NOT_A_DIRECTORY, "rmdir on file should raise error");
+  file.remove(fname);
+  test.assert(!file.exists(fname), "File should not exist");
+  test.assertRaises(function () file.rmdir(fname),
+                    ERRORS.FILE_NOT_FOUND,
+                    "rmdir on non-existing file should raise error");
+};
+
+exports.testRmdirNonempty = function (test) {
+  let dir = profilePath;
+  let path = file.join(dir, "test-file-dir");
+  test.assert(!file.exists(path),
+              "Sanity check: path should not exist: " + path);
+  file.mkpath(path);
+  let filePath = file.join(path, "file");
+  file.open(filePath, "w").close();
+  test.assert(file.exists(filePath),
+              "Sanity check: path should exist: " + filePath);
+  test.assertRaises(function () file.rmdir(path),
+                    /^The directory is not empty: .+$/,
+                    "rmdir on non-empty directory should raise error");
+  file.remove(filePath);
+  file.rmdir(path);
+  test.assert(!file.exists(path), "Path should not exist");
+};