<!DOCTYPE HTML>
<html>
<!--
Test sessionStorage is copied over when a new window opens to the
same domain as the opener.
-->
<head>
  <meta charset="utf-8">
  <title>Test storage copied</title>
  <script src="/tests/SimpleTest/SimpleTest.js"></script>
  <script src="head.js" type="application/javascript"></script>
  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
</head>
<body>
  <script type="application/javascript">
    "use strict";

    function waitForMessage(win) {
      return new Promise(resolve => {
        win.addEventListener("message", function(event) {
          resolve(event.data);
        }, {once: true});
      });
    }

    add_task(async function() {
      const TEST_VALUE = "test-value";
      // This magic value of 2 means that by default, when content tries
      // to open a new window, it'll actually open in a new window instead
      // of a new tab.
      await SpecialPowers.pushPrefEnv({"set": [
        ["browser.link.open_newwindow", 2],
      ]});

      window.sessionStorage.setItem("test-item", TEST_VALUE);
      let win = window.open("file_storage_copied.html", "my_window");
      let data = await waitForMessage(win);
      is(data, TEST_VALUE, "Should have cloned the test value");
      win.close();
    });
  </script>
</body>
</html>
