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+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=1043828
+-->
+<head>
+  <title>Basic test for Switching Keyboards.</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=1043828">Mozilla Bug 1043828</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 KB frame script running in Keyboard B.
+function kbFrameScript() {
+  function tryGetText() {
+    var ctx = content.navigator.mozInputMethod.inputcontext;
+    if (ctx) {
+      var p = ctx.getText();
+      p.then(function(){
+        sendAsyncMessage('test:InputMethod:getText:Resolve');
+      }, function(e){
+        sendAsyncMessage('test:InputMethod:getText:Reject');
+      });
+    } else {
+      dump("Could not get inputcontext") ;
+    }
+  }
+
+  addMessageListener('test:InputMethod:getText:Do', function(){
+    tryGetText();
+  });
+}
+
+function runTest() {
+  let app, keyboardA, keyboardB;
+  let getTextPromise;
+  let mmKeyboardA, mmKeyboardB;
+
+  /**
+   * Test flow:
+   * 1. Create two keyboard iframes & a mozbrowser iframe with a text field in it & focus the text
+   *    field.
+   * 2. Set keyboard frame A as active input. Wait 200ms.
+   * 3. Set keyboard frame B as active input. Wait 200ms.
+   * 4. Set keyboard frame A as inactive. Wait 200ms.
+   * 5. Allow frame b to use getText() with inputcontext to get the content from the text field
+   *    iframe. Wait 200ms.
+   * [Test would succeed if the Promise returned by getText() resolves correctly.
+   *  Test would fail if otherwise]
+   */
+
+  let path = location.pathname;
+  let basePath = location.protocol + '//' + location.host +
+               path.substring(0, path.lastIndexOf('/'));
+
+  const WAIT_TIME = 200;
+
+  // STEP 1: Create the frames.
+  function step1() {
+    // app
+    app = document.createElement('iframe');
+    app.src = basePath + '/file_test_app.html';
+    app.setAttribute('mozbrowser', true);
+    document.body.appendChild(app);
+
+    // keyboards
+    keyboardA = document.createElement('iframe');
+    keyboardA.setAttribute('mozbrowser', true);
+    document.body.appendChild(keyboardA);
+
+    keyboardB = document.createElement('iframe');
+    keyboardB.setAttribute('mozbrowser', true);
+    document.body.appendChild(keyboardB);
+
+    // simulate two different keyboard apps
+    let imeUrl = basePath + '/file_blank.html';
+
+    keyboardA.src = imeUrl;
+    keyboardB.src = imeUrl;
+
+    var handler = {
+      handleEvent: function(){
+        keyboardB.removeEventListener('mozbrowserloadend', this);
+
+        mmKeyboardB = SpecialPowers.getBrowserFrameMessageManager(keyboardB);
+
+        mmKeyboardB.loadFrameScript('data:,(' + kbFrameScript.toString() + ')();', false);
+
+        mmKeyboardB.addMessageListener('test:InputMethod:getText:Resolve', function() {
+          info('getText() was resolved');
+          inputmethod_cleanup();
+        });
+
+        mmKeyboardB.addMessageListener('test:InputMethod:getText:Reject', function() {
+          ok(false, 'getText() was rejected');
+          inputmethod_cleanup();
+        });
+
+        setTimeout(function(){
+          step2();
+        }, WAIT_TIME);
+      }
+    };
+
+    keyboardB.addEventListener('mozbrowserloadend', handler);
+  }
+
+  // STEP 2: Set keyboard A active
+  function step2() {
+    info('step2');
+    let req = keyboardA.setInputMethodActive(true);
+
+    req.onsuccess = function(){
+      setTimeout(function(){
+        step3();
+      }, WAIT_TIME);
+    };
+
+    req.onerror = function(){
+      ok(false, 'setInputMethodActive failed: ' + this.error.name);
+      inputmethod_cleanup();
+    };
+  }
+
+  // STEP 3: Set keyboard B active
+  function step3() {
+    info('step3');
+    let req = keyboardB.setInputMethodActive(true);
+
+    req.onsuccess = function(){
+      setTimeout(function(){
+        step4();
+      }, WAIT_TIME);
+    };
+
+    req.onerror = function(){
+      ok(false, 'setInputMethodActive failed: ' + this.error.name);
+      inputmethod_cleanup();
+    };
+  }
+
+  // STEP 4: Set keyboard A inactive
+  function step4() {
+    info('step4');
+    let req = keyboardA.setInputMethodActive(false);
+
+    req.onsuccess = function(){
+      setTimeout(function(){
+        step5();
+      }, WAIT_TIME);
+    };
+
+    req.onerror = function(){
+      ok(false, 'setInputMethodActive failed: ' + this.error.name);
+      inputmethod_cleanup();
+    };
+  }
+
+  // STEP 5: getText
+  function step5() {
+    info('step5');
+    mmKeyboardB.sendAsyncMessage('test:InputMethod:getText:Do');
+  }
+
+  step1();
+}
+
+</script>
+</pre>
+</body>
+</html>
+