test_dirtyPrefs.js

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/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

/* Tests for handling of the preferences 'dirty' flag (bug 985998) */

function run_test() {

  const ps = Services.prefs;

  let defaultBranch = ps.getDefaultBranch("");

  let userBranch = ps.getBranch("");

  let prefFile = do_get_profile();

  prefFile.append("prefs.js");

  //* *************************************************************************//

  // prefs are not dirty after a write

  ps.savePrefFile(null);

  Assert.ok(!ps.dirty);

  // set a new a user value, we should become dirty

  userBranch.setBoolPref("DirtyTest.new.bool", true);

  Assert.ok(ps.dirty);

  ps.savePrefFile(null);

  // Overwrite a pref with the same value => not dirty

  userBranch.setBoolPref("DirtyTest.new.bool", true);

  Assert.ok(!ps.dirty);

  // Repeat for the other two types

  userBranch.setIntPref("DirtyTest.new.int", 1);

  Assert.ok(ps.dirty);

  ps.savePrefFile(null);

  // Overwrite a pref with the same value => not dirty

  userBranch.setIntPref("DirtyTest.new.int", 1);

  Assert.ok(!ps.dirty);

  userBranch.setCharPref("DirtyTest.new.char", "oop");

  Assert.ok(ps.dirty);

  ps.savePrefFile(null);

  // Overwrite a pref with the same value => not dirty

  userBranch.setCharPref("DirtyTest.new.char", "oop");

  Assert.ok(!ps.dirty);

  // change *type* of a user value -> dirty

  userBranch.setBoolPref("DirtyTest.new.char", false);

  Assert.ok(ps.dirty);

  ps.savePrefFile(null);

  // Set a default pref => not dirty (defaults don't go into prefs.js)

  defaultBranch.setBoolPref("DirtyTest.existing.bool", true);

  Assert.ok(!ps.dirty);

  // Fail to change type of a pref with default value -> not dirty

  do_check_throws(function () {

    userBranch.setCharPref("DirtyTest.existing.bool", "boo");

  }, Cr.NS_ERROR_UNEXPECTED);

  Assert.ok(!ps.dirty);

  // Set user value same as default, not dirty

  userBranch.setBoolPref("DirtyTest.existing.bool", true);

  Assert.ok(!ps.dirty);

  // User value different from default, dirty

  userBranch.setBoolPref("DirtyTest.existing.bool", false);

  Assert.ok(ps.dirty);

  ps.savePrefFile(null);

  // Back to default value, dirty again

  userBranch.setBoolPref("DirtyTest.existing.bool", true);

  Assert.ok(ps.dirty);

  ps.savePrefFile(null);