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+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=944397
+-->
+<head>
+  <title>Basic test for InputMethod API.</title>
+  <script type="application/javascript;version=1.7" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="application/javascript;version=1.7" src="inputmethod_common.js"></script>
+  <link rel="stylesheet" type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=944397">Mozilla Bug 944397</a>
+<p id="display"></p>
+<pre id="test">
+<script class="testbody" type="application/javascript;version=1.7">
+
+SimpleTest.requestFlakyTimeout("untriaged");
+
+inputmethod_setup(function() {
+  runTest();
+});
+
+// The frame script running in file_test_app.html.
+function appFrameScript() {
+  let input = content.document.getElementById('test-input');
+  input.oninput = function() {
+    sendAsyncMessage('test:InputMethod:oninput', {
+      value: input.value
+    });
+  };
+}
+
+function runTest() {
+  let app, keyboard;
+
+  /**
+   * So this test does the following:
+   * 1. Create a mozbrowser iframe with a text field in it, and focus the text field
+   * 2. 100ms. after loading we create new keyboard iframe, that will try to execute
+   *    replaceSurroundingText on the current active inputcontext
+   * 3. That should trigger 'input' event on the said text field
+   * 4. And if that happens we know everything is OK
+   */
+
+  let path = location.pathname;
+  let basePath = location.protocol + '//' + location.host +
+               path.substring(0, path.lastIndexOf('/'));
+
+  // STEP 1: Create an app frame to recieve keyboard inputs.
+  function step1() {
+    app = document.createElement('iframe');
+    app.src = basePath + '/file_test_app.html';
+    app.setAttribute('mozbrowser', true);
+    document.body.appendChild(app);
+    app.addEventListener('mozbrowserloadend', function() {
+      let mm = SpecialPowers.getBrowserFrameMessageManager(app);
+      mm.loadFrameScript('data:,(' + appFrameScript.toString() + ')();', false);
+      mm.addMessageListener("test:InputMethod:oninput", function(ev) {
+        step4(SpecialPowers.wrap(ev).json.value);
+      });
+
+      step2();
+    });
+  }
+
+  function step2() {
+    // STEP 2a: Create a browser frame to load the input method app.
+    keyboard = document.createElement('iframe');
+    keyboard.setAttribute('mozbrowser', true);
+    document.body.appendChild(keyboard);
+
+    // STEP 2b: Grant input privileges to the keyboard iframe
+    let imeUrl = basePath + '/file_inputmethod.html#data';
+
+    // STEP 2c: Tell Gecko to use this iframe as its keyboard app
+    let req = keyboard.setInputMethodActive(true);
+
+    req.onsuccess = function() {
+      ok(true, 'setInputMethodActive succeeded.');
+    };
+
+    req.onerror = function() {
+      ok(false, 'setInputMethodActive failed: ' + this.error.name);
+      inputmethod_cleanup();
+    };
+
+    // STEP 3: Loads the input method app to the browser frame after a delay.
+    setTimeout(function() {
+      keyboard.src = imeUrl;
+    }, 100);
+  }
+
+  function step4(val) {
+    ok(true, 'Keyboard input was received.');
+    is(val, '#dataYuan', 'Input value');
+    inputmethod_cleanup();
+  }
+
+  step1();
+}
+
+</script>
+</pre>
+</body>
+</html>
+