<!DOCTYPE HTML>
<html>
<head>
  <meta charset="utf-8">
  <title>Evict a page from bfcache</title>
  <script src="/tests/SimpleTest/SimpleTest.js"></script>
  <link rel="stylesheet" href="/tests/SimpleTest/test.css"/>
  <script>
  /*
   * This test checks that a page can be evicted from bfcache. Sending a
   * message to an open BroadcastChannel is used for this.
   *
   * First the test opens a window and loads a page there. Another page is then
   * loaded and then session history is navigated back to check if bfcache is
   * enabled. If not, close message is sent to close the opened window and this
   * controller page will finish the test.
   * If bfcache is enabled, session history goes forward, but the
   * BroadcastChannel in the page isn't closed. Then sending the message to go
   * back again should evict the bfcached page.
   * Close message is sent and window closed and test finishes.
   */

  SimpleTest.waitForExplicitFinish();
  var bc = new BroadcastChannel("evict_from_bfcache");
  var pageshowCount = 0;
  bc.onmessage = function(event) {
    if (event.data.type == "pageshow") {
      ++pageshowCount;
      info("pageshow " + pageshowCount);
      if (pageshowCount == 1) {
        bc.postMessage("nextpage");
      } else if (pageshowCount == 2) {
        bc.postMessage("back");
      } else if (pageshowCount == 3) {
        if (!event.data.persisted) {
          ok(true, "BFCache isn't enabled.");
          bc.postMessage("close");
        } else {
          bc.postMessage("forward");
        }
      } else if (pageshowCount == 4) {
        bc.postMessage("back");
      } else if (pageshowCount == 5) {
        ok(!event.data.persisted,
           "The page should have been evicted from BFCache");
        bc.postMessage("close");
      }
    } else if (event.data == "closed") {
      SimpleTest.finish();
    }
  }

  function runTest() {
    window.open("file_evict_from_bfcache.html", "", "noopener");
  }
  </script>
</head>
<body onload="runTest()">
<p id="display"></p>
<div id="content" style="display: none"></div>
<pre id="test"></pre>
</body>
</html>
