test_ext_listener_proxies.html

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<!DOCTYPE HTML>

<html>

<head>

  <title>Test for content script</title>

  <script src="/tests/SimpleTest/SimpleTest.js"></script>

  <script src="/tests/SimpleTest/ExtensionTestUtils.js"></script>

  <script type="text/javascript" src="head.js"></script>

  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>

</head>

<body>

<script type="text/javascript">

"use strict";

add_task(async function test_listener_proxies() {

  let extension = ExtensionTestUtils.loadExtension({

    useAddonManager: "temporary",

    manifest: {

      "permissions": ["storage"],

},

    async background() {

      // Test that adding multiple listeners for the same event works as

      // expected.

      let awaitChanged = () => new Promise(resolve => {

        browser.storage.onChanged.addListener(function listener() {

          browser.storage.onChanged.removeListener(listener);

          resolve();

});

});

      let promises = [

        awaitChanged(),

        awaitChanged(),

];

      function removedListener() {}

      browser.storage.onChanged.addListener(removedListener);

      browser.storage.onChanged.removeListener(removedListener);

      promises.push(awaitChanged(), awaitChanged());

      browser.storage.local.set({foo: "bar"});

      await Promise.all(promises);

      browser.test.notifyPass("onchanged-listeners");

},

});

  await extension.startup();

  await extension.awaitFinish("onchanged-listeners");

  await extension.unload();

});

</script>

</body>

</html>