File: 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>