import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

dom/speakermanager/tests/mochitest.ini

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+[DEFAULT]
+
+[test_speakermanager.html]

dom/speakermanager/tests/test_speakermanager.html

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+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>Test MozSpeakerManager API</title>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none"></div>
+<pre id="test">
+  <script type="application/javascript">
+
+  "use strict";
+
+  function testObject() {
+    var mgr = new MozSpeakerManager();
+    var spkforced = false;
+    mgr.onspeakerforcedchange = function() {
+      if (spkforced) {
+        is(mgr.speakerforced, true, 'speaker should be true');
+        spkforced = false;
+        mgr.forcespeaker = false;
+      } else {
+        is(mgr.speakerforced, false, 'speaker should be false');
+        SimpleTest.finish();
+      }
+    }
+    spkforced = true;
+    mgr.forcespeaker = true;
+  }
+
+  function startTests() {
+    // Currently applicable only on FxOS
+    if (navigator.userAgent.indexOf("Mobile") != -1 &&
+        navigator.appVersion.indexOf("Android") == -1) {
+      testObject();
+    } else {
+      ok(true, "MozSpeakerManager on Firefox OS only.");
+      SimpleTest.finish();
+    }
+  }
+
+  SimpleTest.waitForExplicitFinish();
+  SpecialPowers.pushPermissions(
+    [{ "type": "speaker-control", "allow": 1, "context": document }],
+    startTests);
+
+  </script>
+</pre>
+</body>
+</html>