gecko-dev/browser/components/sessionstore/test/browser_739531.js

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

// This test ensures that attempts made to save/restore ("duplicate") pages
// using designmode AND make changes to document structure (remove body)
// don't result in uncaught errors and a broken browser state.

function test() {
  waitForExplicitFinish();

  let testURL = "http://mochi.test:8888/browser/" +
    "browser/components/sessionstore/test/browser_739531_sample.html";

  let loadCount = 0;
  let tab = BrowserTestUtils.addTab(gBrowser, testURL);
  tab.linkedBrowser.addEventListener("load", function onLoad(aEvent) {
    // make sure both the page and the frame are loaded
    if (++loadCount < 2)
      return;
    tab.linkedBrowser.removeEventListener("load", onLoad, true);

    // executeSoon to allow the JS to execute on the page
    executeSoon(function() {

      let tab2;
      let caughtError = false;
      try {
        tab2 = ss.duplicateTab(window, tab);
      } catch (e) {
        caughtError = true;
        info(e);
      }

      is(gBrowser.tabs.length, 3, "there should be 3 tabs");

      ok(!caughtError, "duplicateTab didn't throw");

      // if the test fails, we don't want to try to close a tab that doesn't exist
      if (tab2)
        gBrowser.removeTab(tab2);
      gBrowser.removeTab(tab);

      finish();
    });
  }, true);
}