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diff --git a/dom/serviceworkers/test/test_post_message_source.html b/dom/serviceworkers/test/test_post_message_source.html
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+++ b/dom/serviceworkers/test/test_post_message_source.html
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+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Bug 1142015 - Test service worker post message source </title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none"></div>
+<pre id="test"></pre>
+<script class="testbody" type="text/javascript">
+  var magic_value = "MAGIC_VALUE_RANDOM";
+  var registration;
+  function start() {
+    return navigator.serviceWorker.register("source_message_posting_worker.js",
+                                            { scope: "./nonexistent_scope/" })
+      .then((swr) => registration = swr);
+  }
+
+  function unregister() {
+    return registration.unregister().then(function(result) {
+      ok(result, "Unregister should return true.");
+    }, function(e) {
+      dump("Unregistering the SW failed with " + e + "\n");
+    });
+  }
+
+
+  function testPostMessage(swr) {
+    var p = new Promise(function(res, rej) {
+      navigator.serviceWorker.onmessage = function(e) {
+        ok(e.data === magic_value, "Worker posted the correct value.");
+        res();
+      }
+    });
+
+    ok(swr.installing, "Installing worker exists.");
+    swr.installing.postMessage(magic_value);
+    return p;
+  }
+
+
+  function runTest() {
+    start()
+      .then(testPostMessage)
+      .then(unregister)
+      .catch(function(e) {
+        ok(false, "Some test failed with error " + e);
+      }).then(SimpleTest.finish);
+  }
+
+  SimpleTest.waitForExplicitFinish();
+  SpecialPowers.pushPrefEnv({"set": [
+    ["dom.serviceWorkers.exemptFromPerDomainMax", true],
+    ["dom.serviceWorkers.enabled", true],
+    ["dom.serviceWorkers.testing.enabled", true]
+  ]}, runTest);
+</script>
+</pre>
+</body>
+</html>