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+<!-- Any copyright is dedicated to the Public Domain.
+- http://creativecommons.org/publicdomain/zero/1.0/ -->
+<!DOCTYPE HTML>
+<html>
+
+<head>
+  <meta charset="utf-8">
+  <title>Test the IOUtils file I/O API</title>
+  <script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" href="chrome://mochikit/content/tests/SimpleTest/test.css" />
+  <script>
+    "use strict";
+
+    const { ObjectUtils } = ChromeUtils.import("resource://gre/modules/ObjectUtils.jsm");
+
+    const TEST_PATH = PathUtils.join(PathUtils.tempDir, "test-ioutils-getfile");
+
+    add_task(async function test_getFile() {
+      const expectedPath = PathUtils.join(TEST_PATH, "foo", "bar", "baz", "get-file.txt");
+      const parentPath = PathUtils.parent(expectedPath);
+
+      ok(!(await IOUtils.exists(parentPath)), "Parent directory should not exist");
+
+      const file = await IOUtils.getFile(TEST_PATH, "foo", "bar", "baz", "get-file.txt");
+      const path = file.path;
+
+      is(path, expectedPath, "Should have the correct path");
+      ok(await IOUtils.exists(parentPath), "Parent directory should be created");
+      ok(!(await IOUtils.exists(path)), "File should not be created");
+
+      await IOUtils.remove(TEST_PATH, { recursive: true });
+    });
+
+    add_task(async function test_getFile_exists() {
+      const expectedPath = PathUtils.join(TEST_PATH, "foo", "bar", "baz", "get-file-exists.txt");
+
+      await IOUtils.makeDirectory(PathUtils.parent(expectedPath));
+      await IOUtils.writeUTF8(expectedPath, "hello world");
+
+      const file = await IOUtils.getFile(TEST_PATH, "foo", "bar", "baz", "get-file-exists.txt");
+      is(file.path, expectedPath, "Should have the correct path");
+      is(await IOUtils.readUTF8(file.path), "hello world", "Contents should be unchanged");
+
+      await IOUtils.remove(TEST_PATH, { recursive: true });
+    });
+
+    add_task(async function test_getDirectory() {
+      const expectedPath = PathUtils.join(TEST_PATH, "qux", "quux", "corge");
+
+      ok(!(await IOUtils.exists(PathUtils.parent(expectedPath))), "Parent directory should not exist");
+
+      const file = await IOUtils.getDirectory(TEST_PATH, "qux", "quux", "corge");
+
+      is(file.path, expectedPath, "Should have the correct path");
+      ok(await IOUtils.exists(expectedPath), "Directory should be created");
+
+      const info = await IOUtils.stat(expectedPath);
+      is(info.type, "directory", "Should create a directory");
+
+      await IOUtils.remove(TEST_PATH, { recursive: true });
+    });
+
+    add_task(async function test_getDirectory_exists() {
+      const expectedPath = PathUtils.join(TEST_PATH, "qux", "quux", "corge");
+
+      await IOUtils.makeDirectory(expectedPath);
+
+      const file = await IOUtils.getDirectory(TEST_PATH, "qux", "quux", "corge");
+      is(file.path, expectedPath, "Should have the correct path");
+      ok(await IOUtils.exists(expectedPath), "Directory should still exist");
+
+      const info = await IOUtils.stat(expectedPath);
+      is(info.type, "directory", "Should still be a directory");
+
+      await IOUtils.remove(TEST_PATH, { recursive: true });
+    });
+  </script>
+</head>
+
+<body>
+  <p id="display"></p>
+  <div id="content" style="display: none"></div>
+  <pre id="test"></pre>
+</body>
+
+</html>