<html>
  <head>
    <title>
      Test that ensures beforeunload is fired when session-history-in-parent is enabled
    </title>
    <script src="/tests/SimpleTest/SimpleTest.js"></script>
    <link rel="stylesheet" href="/tests/SimpleTest/test.css"/>
  </head>
  <script>
    SimpleTest.waitForExplicitFinish();

    /*
     * This test ensures beforeunload is fired on the current page
     * when it is entering BFCache, and the next page is not coming from
     * session history and also not coming out from BFCache.
     *
     * (1) The controller page opens a new window, and page A is loaded there.
     * (2) Page A then navigates to page B, and a beforeunload event
     *     listener is registered on page B.
     * (3) Page B then navigates to page C, and the beforeunload handler
     *     should send a message to the controller page.
     * (4) Page C then navigates back to page B to check if page B has
     *     been successfully added to BFCache.
     */

    var bc = new BroadcastChannel("ship_beforeunload");
    var pageshowCount = 0;

    var beforeUnloadFired = false;
    bc.onmessage = function(event) {
      if (event.data.type == "pageshow") {
        ++pageshowCount;
        if (pageshowCount == 1) {
          bc.postMessage({action: "navigate_to_page_b"});
        } else if (pageshowCount == 2) {
          ok(!event.data.persisted, "?page B shouldn't in BFCache because it's the first navigation");
          bc.postMessage({action: "register_beforeunload",
            loadNextPageFromSessionHistory: false});
        } else if (pageshowCount == 3) {
          ok(!event.data.persisted, "navigated to page C that was a new page");
          ok(beforeUnloadFired, "beforeUnload should be fired on page B");
          bc.postMessage({action: "back_to_page_b", forwardNavigateToPageB: false});
        } else if (pageshowCount == 4) {
          ok(event.data.persisted, "page B has been successfully added to BFCache");
          bc.postMessage({action: "close"});
          SimpleTest.finish();
        }
      } else if (event.data == "beforeunload_fired") {
        beforeUnloadFired = true;
      }
    }

    function runTest() {
      SpecialPowers.pushPrefEnv({"set": [
          ["fission.bfcacheInParent", true],
          ["docshell.shistory.bfcache.ship_allow_beforeunload_listeners", true]
        ]},
        function() {
          window.open("file_ship_beforeunload_fired.html", "", "noopener");
        }
      );
    }
  </script>
  <body onload="runTest()"></body>
</html>
