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diff --git a/editor/spellchecker/tests/test_async_UpdateCurrentDictionary.html b/editor/spellchecker/tests/test_async_UpdateCurrentDictionary.html
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+++ b/editor/spellchecker/tests/test_async_UpdateCurrentDictionary.html
@@ -0,0 +1,60 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=856270
+-->
+<head>
+  <title>Test for Bug 856270 - Async UpdateCurrentDictionary</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" href="/tests/SimpleTest/test.css">
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=856270">Mozilla Bug 856270</a>
+<p id="display"></p>
+<div id="content">
+<textarea id="editor" spellcheck="true"></textarea>
+</div>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+addLoadEvent(start);
+
+function start() {
+  var textarea = document.getElementById("editor");
+  textarea.focus();
+
+  const { onSpellCheck } = SpecialPowers.ChromeUtils.import(
+    "resource://testing-common/AsyncSpellCheckTestHelper.jsm"
+  )
+  onSpellCheck(textarea, function() {
+    var isc = SpecialPowers.wrap(textarea).editor.getInlineSpellChecker(false);
+    ok(isc, "Inline spell checker should exist after focus and spell check");
+    var sc = isc.spellChecker;
+
+    sc.setCurrentDictionaries(["testing-XX"]).then(() => {
+      is(true, false, "Setting a non-existent dictionary should fail");
+    }, () => {
+      let currentDictionaries = sc.getCurrentDictionaries();
+
+      is(currentDictionaries.length, 0, "expected no dictionaries");
+      // First, set the lang attribute on the textarea, call Update, and make
+      // sure the spell checker's language was updated appropriately.
+      var lang = "en-US";
+      textarea.setAttribute("lang", lang);
+      sc.UpdateCurrentDictionary(function() {
+        currentDictionaries = sc.getCurrentDictionaries();
+        is(currentDictionaries.length, 1, "expected one dictionary");
+        is(sc.getCurrentDictionaries()[0], lang,
+          "UpdateCurrentDictionary should set the current dictionary.");
+        sc.setCurrentDictionaries([]).then(() => {
+          SimpleTest.finish();
+        });
+      });
+    });
+  });
+}
+</script>
+</pre>
+</body>
+</html>