test_ext_background_canvas.html

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<!DOCTYPE HTML>

<html>

<head>

  <title>Test for background page canvas rendering</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_background_canvas() {

  function background() {

    try {

      let canvas = document.createElement("canvas");

      let context = canvas.getContext("2d");

      // This ensures that we have a working PresShell, and can successfully

      // calculate font metrics.

      context.font = "8pt fixed";

      browser.test.notifyPass("background-canvas");

    } catch (e) {

      browser.test.fail(`Error: ${e} :: ${e.stack}`);

      browser.test.notifyFail("background-canvas");

  let extension = ExtensionTestUtils.loadExtension({ background });

  await extension.startup();

  await extension.awaitFinish("background-canvas");

  await extension.unload();

});

</script>

</body>

</html>