Mypal68/browser/components/sessionstore/test/browser_628270.js

/* Any copyright is dedicated to the Public Domain.
   http://creativecommons.org/publicdomain/zero/1.0/ */

function test() {
  let assertNumberOfTabs = function(num, msg) {
    is(gBrowser.tabs.length, num, msg);
  };

  let assertNumberOfVisibleTabs = function(num, msg) {
    is(gBrowser.visibleTabs.length, num, msg);
  };

  waitForExplicitFinish();

  // check prerequisites
  assertNumberOfTabs(1, "we start off with one tab");

  // setup
  let tab = BrowserTestUtils.addTab(gBrowser, "about:mozilla");

  whenTabIsLoaded(tab, function() {
    // hide the newly created tab
    assertNumberOfVisibleTabs(2, "there are two visible tabs");
    gBrowser.showOnlyTheseTabs([gBrowser.tabs[0]]);
    assertNumberOfVisibleTabs(1, "there is one visible tab");
    ok(tab.hidden, "newly created tab is now hidden");

    // close and restore hidden tab
    promiseRemoveTabAndSessionState(tab).then(() => {
      tab = ss.undoCloseTab(window, 0);

      // check that everything was restored correctly, clean up and finish
      whenTabIsLoaded(tab, function() {
        is(
          tab.linkedBrowser.currentURI.spec,
          "about:mozilla",
          "restored tab has correct url"
        );

        gBrowser.removeTab(tab);
        finish();
      });
    });
  });
}

function whenTabIsLoaded(tab, callback) {
  tab.linkedBrowser.addEventListener(
    "load",
    function() {
      callback();
    },
    { capture: true, once: true }
  );
}