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diff --git a/dom/l10n/tests/mochitest/dom_localization/test_setAttributes.html b/dom/l10n/tests/mochitest/dom_localization/test_setAttributes.html
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+++ b/dom/l10n/tests/mochitest/dom_localization/test_setAttributes.html
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+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>Test DOMLocalization.prototype.setAttributes and DOMLocalization.prototype.setArgs</title>
+  <script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css">
+  <script type="application/javascript">
+  "use strict";
+  const l10nReg = new L10nRegistry();
+
+  window.onload = function() {
+    SimpleTest.waitForExplicitFinish();
+
+    const domLoc = new DOMLocalization(
+      [],
+      false,
+      l10nReg,
+    );
+
+    const p1 = document.querySelectorAll("p")[0];
+
+    domLoc.setAttributes(p1, "title");
+    is(
+      p1.getAttribute("data-l10n-id"),
+      "title",
+      "The data-l10n-id can be set by setAttributes."
+    );
+    is(
+      p1.getAttribute("data-l10n-args"),
+      null,
+      "The data-l10n-args is unset."
+    );
+
+
+    domLoc.setAttributes(p1, "title2", {userName: "John"});
+    is(
+      p1.getAttribute("data-l10n-id"),
+      "title2",
+      "The data-l10n-id can be set by setAttributes."
+    );
+    is(
+      p1.getAttribute("data-l10n-args"),
+      JSON.stringify({userName: "John"}),
+      "The data-l10n-args can be set by setAttributes."
+    );
+
+    domLoc.setArgs(p1, {userName: "Jane"});
+    is(
+      p1.getAttribute("data-l10n-id"),
+      "title2",
+      "The data-l10n-id is unchanged by setArgs."
+    );
+    is(
+      p1.getAttribute("data-l10n-args"),
+      JSON.stringify({userName: "Jane"}),
+      "The data-l10n-args can by set by setArgs."
+    );
+
+    domLoc.setArgs(p1);
+    is(
+      p1.getAttribute("data-l10n-id"),
+      "title2",
+      "The data-l10n-id is unchanged by setArgs."
+    );
+    is(
+      p1.getAttribute("data-l10n-args"),
+      null,
+      "The data-l10n-args be unset by setArgs."
+    );
+
+    SimpleTest.finish();
+  };
+  </script>
+</head>
+<body>
+  <p />
+</body>
+</html>