gecko/browser/components/sessionstore/test/browser_448741.js

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 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
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 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is sessionstore test code.
 *
 * The Initial Developer of the Original Code is
 * Simon Bünzli <zeniko@gmail.com>.
 * Portions created by the Initial Developer are Copyright (C) 2008
 * the Initial Developer. All Rights Reserved.
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 *
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function test() {
  /** Test for Bug 448741 **/

  waitForExplicitFinish();

  let uniqueName = "bug 448741";
  let uniqueValue = "as good as unique: " + Date.now();

  // set a unique value on a new, blank tab
  var tab = gBrowser.addTab();
  tab.linkedBrowser.stop();
  ss.setTabValue(tab, uniqueName, uniqueValue);
  let valueWasCleaned = false;

  // prevent our value from being written to disk
  function cleaningObserver(aSubject, aTopic, aData) {
    ok(aTopic == "sessionstore-state-write", "observed correct topic?");
    ok(aSubject instanceof Ci.nsISupportsString, "subject is a string?");
    ok(aSubject.data.indexOf(uniqueValue) > -1, "data contains our value?");

    // find the data for the newly added tab and delete it
    let state = JSON.parse(aSubject.data);
    state.windows.forEach(function (winData) {
      winData.tabs.forEach(function (tabData) {
        if (tabData.extData && uniqueName in tabData.extData &&
            tabData.extData[uniqueName] == uniqueValue) {
          delete tabData.extData[uniqueName];
          valueWasCleaned = true;
        }
      });
    });

    ok(valueWasCleaned, "found and removed the specific tab value");
    aSubject.data = JSON.stringify(state);
    Services.obs.removeObserver(cleaningObserver, aTopic, false);
  }

  // make sure that all later observers don't see that value any longer
  function checkingObserver(aSubject, aTopic, aData) {
    ok(valueWasCleaned && aSubject instanceof Ci.nsISupportsString,
       "ready to check the cleaned state?");
    ok(aSubject.data.indexOf(uniqueValue) == -1, "data no longer contains our value?");

    // clean up
    gBrowser.removeTab(tab);
    Services.obs.removeObserver(checkingObserver, aTopic, false);
    if (gPrefService.prefHasUserValue("browser.sessionstore.interval"))
      gPrefService.clearUserPref("browser.sessionstore.interval");
    finish();
  }

  // last added observers are invoked first
  Services.obs.addObserver(checkingObserver, "sessionstore-state-write", false);
  Services.obs.addObserver(cleaningObserver, "sessionstore-state-write", false);

  // trigger an immediate save operation
  gPrefService.setIntPref("browser.sessionstore.interval", 0);
}