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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 src="file_ioutils_test_fixtures.js"></script>
+  <script>
+    "use strict";
+
+    const { Assert } = ChromeUtils.import("resource://testing-common/Assert.jsm");
+
+    add_task(async function test_computeHexDigest() {
+      const tempDir = PathUtils.join(PathUtils.tempDir, "ioutils-test-compute-hex-digest.tmp.d");
+      await createDir(tempDir);
+
+      const path = PathUtils.join(tempDir, "file");
+      await IOUtils.writeUTF8(path, "hello world\n");
+
+      const DIGESTS = [
+        "22596363b3de40b06f981fb85d82312e8c0ed511",
+        "a948904f2f0f479b8f8197694b30184b0d2ed1c1cd2a1ec0fb85d299a192a447",
+        "6b3b69ff0a404f28d75e98a066d3fc64fffd9940870cc68bece28545b9a75086b343d7a1366838083e4b8f3ca6fd3c80",
+        "db3974a97f2407b7cae1ae637c0030687a11913274d578492558e39c16c017de84eacdc8c62fe34ee4e12b4b1428817f09b6a2760c3f8a664ceae94d2434a593",
+      ];
+      const ALGORITHMS = ["sha1", "sha256", "sha384", "sha512"];
+
+      for (let i = 0; i < ALGORITHMS.length; i++) {
+        const alg = ALGORITHMS[i];
+        const expected = DIGESTS[i];
+
+        Assert.equal(
+          await IOUtils.computeHexDigest(path, alg),
+          expected,
+          `IOUtils.hashFile() has expected value for ${alg}`);
+      }
+
+      await cleanup(tempDir);
+    });
+  </script>
+</head>
+
+<body>
+  <p id="display"></p>
+  <div id="content" style="display: none"></div>
+  <pre id="test"></pre>
+</body>
+
+</html>