diff -r 000000000000 -r 6474c204b198 modules/libpref/test/unit/test_libPrefs.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/modules/libpref/test/unit/test_libPrefs.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,392 @@
+/* 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/. */
+
+const PREF_INVALID = 0;
+const PREF_BOOL    = 128;
+const PREF_INT     = 64;
+const PREF_STRING  = 32;
+
+const MAX_PREF_LENGTH = 1 * 1024 * 1024;
+
+function makeList(a)
+{
+  var o = {};
+  for(var i=0; i<a.length; i++)
+  {
+    o[a[i]] = '';
+  }
+  return o;
+}
+
+function run_test() {
+
+  var ps = Cc["@mozilla.org/preferences-service;1"].
+            getService(Ci.nsIPrefService);
+
+  var pb2= Cc["@mozilla.org/preferences-service;1"].
+            getService(Ci.nsIPrefBranch);
+
+  var pb = Cc["@mozilla.org/preferences-service;1"].
+            getService(Ci.nsIPrefBranch);
+
+  //**************************************************************************//
+  // Nullsafety
+
+  do_check_throws(function() {
+    pb.getPrefType(null); },  Cr.NS_ERROR_INVALID_ARG);
+  do_check_throws(function() {
+    pb.getBoolPref(null); },  Cr.NS_ERROR_INVALID_ARG);
+  do_check_throws(function() {
+    pb.setBoolPref(null, false); },  Cr.NS_ERROR_INVALID_ARG);
+  do_check_throws(function() {
+    pb.getIntPref(null); },  Cr.NS_ERROR_INVALID_ARG);
+  do_check_throws(function() {
+    pb.setIntPref(null, 0); },  Cr.NS_ERROR_INVALID_ARG);
+  do_check_throws(function() {
+    pb.getCharPref(null); },  Cr.NS_ERROR_INVALID_ARG);
+  do_check_throws(function() {
+    pb.setCharPref(null, null); },  Cr.NS_ERROR_INVALID_ARG);
+  do_check_throws(function() {
+    pb.getComplexValue(null, Components.interfaces.nsISupportsString); },  Cr.NS_ERROR_INVALID_ARG);
+  do_check_throws(function() {
+    pb.setComplexValue(null, Components.interfaces.nsISupportsString, pb); },  Cr.NS_ERROR_INVALID_ARG);
+  do_check_throws(function() {
+    pb.clearUserPref(null); },  Cr.NS_ERROR_INVALID_ARG);
+  do_check_throws(function() {
+    pb.prefHasUserValue(null); },  Cr.NS_ERROR_INVALID_ARG);
+  do_check_throws(function() {
+    pb.lockPref(null); },  Cr.NS_ERROR_INVALID_ARG);
+  do_check_throws(function() {
+    pb.prefIsLocked(null); },  Cr.NS_ERROR_INVALID_ARG);
+  do_check_throws(function() {
+    pb.unlockPref(null); },  Cr.NS_ERROR_INVALID_ARG);
+  do_check_throws(function() {
+    pb.deleteBranch(null); },  Cr.NS_ERROR_INVALID_ARG);
+  do_check_throws(function() {
+    pb.getChildList(null); },  Cr.NS_ERROR_INVALID_ARG);
+
+  //**************************************************************************//
+  // Nonexisting user preferences
+
+  do_check_eq(pb.prefHasUserValue("UserPref.nonexistent.hasUserValue"), false);
+  pb.clearUserPref("UserPref.nonexistent.clearUserPref"); // shouldn't throw
+  do_check_eq(pb.getPrefType("UserPref.nonexistent.getPrefType"), PREF_INVALID);
+  do_check_eq(pb.root, "");
+
+  // bool...
+  do_check_throws(function() {
+    pb.getBoolPref("UserPref.nonexistent.getBoolPref");}, Cr.NS_ERROR_UNEXPECTED);
+  pb.setBoolPref("UserPref.nonexistent.setBoolPref", false);
+  do_check_eq(pb.getBoolPref("UserPref.nonexistent.setBoolPref"), false);
+
+  // int...
+  do_check_throws(function() {
+    pb.getIntPref("UserPref.nonexistent.getIntPref");}, Cr.NS_ERROR_UNEXPECTED);
+  pb.setIntPref("UserPref.nonexistent.setIntPref", 5);
+  do_check_eq(pb.getIntPref("UserPref.nonexistent.setIntPref"), 5);
+
+  // char
+  do_check_throws(function() {
+    pb.getCharPref("UserPref.nonexistent.getCharPref");}, Cr.NS_ERROR_UNEXPECTED);
+  pb.setCharPref("UserPref.nonexistent.setCharPref", "_test");
+  do_check_eq(pb.getCharPref("UserPref.nonexistent.setCharPref"), "_test");
+
+  //**************************************************************************//
+  // Existing user Prefs and data integrity test (round-trip match)
+
+  pb.setBoolPref("UserPref.existing.bool", true);
+  pb.setIntPref("UserPref.existing.int", 23);
+  pb.setCharPref("UserPref.existing.char", "hey");
+
+  // getPref should return the pref value
+  do_check_eq(pb.getBoolPref("UserPref.existing.bool"), true);
+  do_check_eq(pb.getIntPref("UserPref.existing.int"), 23);
+  do_check_eq(pb.getCharPref("UserPref.existing.char"), "hey");
+
+  // setPref should not complain and should change the value of the pref
+  pb.setBoolPref("UserPref.existing.bool", false);
+  do_check_eq(pb.getBoolPref("UserPref.existing.bool"), false);
+  pb.setIntPref("UserPref.existing.int", 24);
+  do_check_eq(pb.getIntPref("UserPref.existing.int"), 24);
+  pb.setCharPref("UserPref.existing.char", "hej då!");
+  do_check_eq(pb.getCharPref("UserPref.existing.char"), "hej då!");
+
+  // prefHasUserValue should return true now
+  do_check_true(pb.prefHasUserValue("UserPref.existing.bool"));
+  do_check_true(pb.prefHasUserValue("UserPref.existing.int"));
+  do_check_true(pb.prefHasUserValue("UserPref.existing.char"));
+
+  // clearUserPref should remove the pref
+  pb.clearUserPref("UserPref.existing.bool");
+  do_check_false(pb.prefHasUserValue("UserPref.existing.bool"));
+  pb.clearUserPref("UserPref.existing.int");
+  do_check_false(pb.prefHasUserValue("UserPref.existing.int"));
+  pb.clearUserPref("UserPref.existing.char");
+  do_check_false(pb.prefHasUserValue("UserPref.existing.char"));
+
+  //**************************************************************************//
+  // Large value test
+
+  let largeStr = new Array(MAX_PREF_LENGTH + 1).join('x');
+  pb.setCharPref("UserPref.large.char", largeStr);
+  largeStr += 'x';
+  do_check_throws(function() {
+    pb.setCharPref("UserPref.large.char", largeStr); }, Cr.NS_ERROR_ILLEGAL_VALUE);
+
+  //**************************************************************************//
+  // getPrefType test
+
+  // bool...
+  pb.setBoolPref("UserPref.getPrefType.bool", true);
+  do_check_eq(pb.getPrefType("UserPref.getPrefType.bool"), PREF_BOOL);
+
+  // int...
+  pb.setIntPref("UserPref.getPrefType.int", -234);
+  do_check_eq(pb.getPrefType("UserPref.getPrefType.int"), PREF_INT);
+
+  // char...
+  pb.setCharPref("UserPref.getPrefType.char", "testing1..2");
+  do_check_eq(pb.getPrefType("UserPref.getPrefType.char"), PREF_STRING);
+
+  //**************************************************************************//
+  // getBranch tests
+  
+  do_check_eq(ps.root, "");
+
+  // bool ...
+  pb.setBoolPref("UserPref.root.boolPref", true);
+  let pb_1 = ps.getBranch("UserPref.root.");
+  do_check_eq(pb_1.getBoolPref("boolPref"), true);
+  let pb_2 = ps.getBranch("UserPref.root.boolPref");
+  do_check_eq(pb_2.getBoolPref(""), true);
+  pb_2.setBoolPref(".anotherPref", false);
+  let pb_3 = ps.getBranch("UserPref.root.boolPre");
+  do_check_eq(pb_3.getBoolPref("f.anotherPref"), false);
+
+  // int ...
+  pb.setIntPref("UserPref.root.intPref", 23);
+  let pb_1 = ps.getBranch("UserPref.root.");
+  do_check_eq(pb_1.getIntPref("intPref"), 23);
+  let pb_2 = ps.getBranch("UserPref.root.intPref");
+  do_check_eq(pb_2.getIntPref(""), 23);
+  pb_2.setIntPref(".anotherPref", 69);
+  let pb_3 = ps.getBranch("UserPref.root.intPre");
+  do_check_eq(pb_3.getIntPref("f.anotherPref"), 69);
+
+  // char...
+  pb.setCharPref("UserPref.root.charPref", "_char");
+  let pb_1 = ps.getBranch("UserPref.root.");
+  do_check_eq(pb_1.getCharPref("charPref"), "_char");
+  let pb_2 = ps.getBranch("UserPref.root.charPref");
+  do_check_eq(pb_2.getCharPref(""), "_char");
+  pb_2.setCharPref(".anotherPref", "_another");
+  let pb_3 = ps.getBranch("UserPref.root.charPre");
+  do_check_eq(pb_3.getCharPref("f.anotherPref"), "_another");
+
+  //**************************************************************************//
+  // getChildlist tests
+
+  // get an already set prefBranch
+  pb1 = ps.getBranch("UserPref.root.");
+  let prefList = pb1.getChildList("");
+  do_check_eq(prefList.length, 6);
+
+  // check for specific prefs in the array : the order is not important
+  do_check_true("boolPref" in makeList(prefList));
+  do_check_true("intPref" in makeList(prefList));
+  do_check_true("charPref" in makeList(prefList));
+  do_check_true("boolPref.anotherPref" in makeList(prefList));
+  do_check_true("intPref.anotherPref" in makeList(prefList));
+  do_check_true("charPref.anotherPref" in makeList(prefList));
+
+  //**************************************************************************//
+  // Default branch tests
+
+  // bool...
+  pb1 = ps.getDefaultBranch("");
+  pb1.setBoolPref("DefaultPref.bool", true);
+  do_check_eq(pb1.getBoolPref("DefaultPref.bool"), true);  
+  do_check_false(pb1.prefHasUserValue("DefaultPref.bool"));
+  ps.setBoolPref("DefaultPref.bool", false);
+  do_check_true(pb1.prefHasUserValue("DefaultPref.bool"));
+  do_check_eq(ps.getBoolPref("DefaultPref.bool"), false); 
+
+  // int...
+  pb1 = ps.getDefaultBranch("");
+  pb1.setIntPref("DefaultPref.int", 100);
+  do_check_eq(pb1.getIntPref("DefaultPref.int"), 100);  
+  do_check_false(pb1.prefHasUserValue("DefaultPref.int"));
+  ps.setIntPref("DefaultPref.int", 50);
+  do_check_true(pb1.prefHasUserValue("DefaultPref.int"));
+  do_check_eq(ps.getIntPref("DefaultPref.int"), 50); 
+
+  // char...
+  pb1 = ps.getDefaultBranch("");
+  pb1.setCharPref("DefaultPref.char", "_default");
+  do_check_eq(pb1.getCharPref("DefaultPref.char"), "_default");  
+  do_check_false(pb1.prefHasUserValue("DefaultPref.char"));
+  ps.setCharPref("DefaultPref.char", "_user");
+  do_check_true(pb1.prefHasUserValue("DefaultPref.char"));
+  do_check_eq(ps.getCharPref("DefaultPref.char"), "_user"); 
+
+  //**************************************************************************//
+  // pref Locking/Unlocking tests
+
+  // locking and unlocking a nonexistent pref should throw
+  do_check_throws(function() {
+    ps.lockPref("DefaultPref.nonexistent");}, Cr.NS_ERROR_UNEXPECTED);
+  do_check_throws(function() {
+    ps.unlockPref("DefaultPref.nonexistent");}, Cr.NS_ERROR_UNEXPECTED);
+
+  // getting a locked pref branch should return the "default" value
+  do_check_false(ps.prefIsLocked("DefaultPref.char"));
+  ps.lockPref("DefaultPref.char");
+  do_check_eq(ps.getCharPref("DefaultPref.char"), "_default"); 
+  do_check_true(ps.prefIsLocked("DefaultPref.char"));
+
+  // getting an unlocked pref branch should return the "user" value 
+  ps.unlockPref("DefaultPref.char");
+  do_check_eq(ps.getCharPref("DefaultPref.char"), "_user"); 
+  do_check_false(ps.prefIsLocked("DefaultPref.char"));
+
+  // setting the "default" value to a user pref branch should
+  // make prefHasUserValue return false (documented behavior)
+  ps.setCharPref("DefaultPref.char", "_default");
+  do_check_false(pb1.prefHasUserValue("DefaultPref.char"));
+
+  // unlocking and locking multiple times shouldn't throw
+  ps.unlockPref("DefaultPref.char");
+  ps.lockPref("DefaultPref.char");
+  ps.lockPref("DefaultPref.char");
+
+  //**************************************************************************//
+  // resetBranch test
+
+  // NOT IMPLEMENTED YET in module/libpref. So we're not testing !
+  // uncomment the following if resetBranch ever gets implemented.
+  /*ps.resetBranch("DefaultPref");
+  do_check_eq(ps.getBoolPref("DefaultPref.bool"), true);
+  do_check_eq(ps.getIntPref("DefaultPref.int"), 100);
+  do_check_eq(ps.getCharPref("DefaultPref.char"), "_default");*/
+
+  //**************************************************************************//
+  // deleteBranch tests
+
+  // TODO : Really, this should throw!, by documentation.
+  // do_check_throws(function() {
+  // ps.deleteBranch("UserPref.nonexistent.deleteBranch");}, Cr.NS_ERROR_UNEXPECTED);
+
+  ps.deleteBranch("DefaultPref");
+  pb = ps.getBranch("DefaultPref");
+  pb1 = ps.getDefaultBranch("DefaultPref");
+
+  // getting prefs on deleted user branches should throw
+  do_check_throws(function() {
+    pb.getBoolPref("DefaultPref.bool");}, Cr.NS_ERROR_UNEXPECTED);
+  do_check_throws(function() {
+    pb.getIntPref("DefaultPref.int");}, Cr.NS_ERROR_UNEXPECTED);
+  do_check_throws(function() {
+    pb.getCharPref("DefaultPref.char");}, Cr.NS_ERROR_UNEXPECTED);
+
+  // getting prefs on deleted default branches should throw
+  do_check_throws(function() {
+    pb1.getBoolPref("DefaultPref.bool");}, Cr.NS_ERROR_UNEXPECTED);
+  do_check_throws(function() {
+    pb1.getIntPref("DefaultPref.int");}, Cr.NS_ERROR_UNEXPECTED);
+  do_check_throws(function() {
+    pb1.getCharPref("DefaultPref.char");}, Cr.NS_ERROR_UNEXPECTED);
+
+  //**************************************************************************//
+  // savePrefFile & readPrefFile tests
+
+  // set some prefs
+  ps.setBoolPref("ReadPref.bool", true);
+  ps.setIntPref("ReadPref.int", 230);
+  ps.setCharPref("ReadPref.char", "hello");
+
+  // save those prefs in a file
+  let savePrefFile = do_get_cwd();
+  savePrefFile.append("data");
+  savePrefFile.append("savePref.js");
+  if (savePrefFile.exists())
+    savePrefFile.remove(false);
+  savePrefFile.create(Ci.nsIFile.NORMAL_FILE_TYPE, 0666);
+  ps.savePrefFile(savePrefFile);
+  ps.resetPrefs();
+
+  // load a preexisting pref file
+  let prefFile = do_get_file("data/testPref.js");
+  ps.readUserPrefs(prefFile);
+
+  // former prefs should have been replaced/lost
+  do_check_throws(function() {
+    do_check_eq(pb.getBoolPref("ReadPref.bool"));}, Cr.NS_ERROR_UNEXPECTED);
+  do_check_throws(function() {
+    do_check_eq(pb.getIntPref("ReadPref.int"));}, Cr.NS_ERROR_UNEXPECTED);
+  do_check_throws(function() {
+    do_check_eq(pb.getCharPref("ReadPref.char"));}, Cr.NS_ERROR_UNEXPECTED);
+
+  // loaded prefs should read ok.
+  pb = ps.getBranch("testPref.");
+  do_check_eq(pb.getBoolPref("bool1"), true);
+  do_check_eq(pb.getBoolPref("bool2"), false);
+  do_check_eq(pb.getIntPref("int1"), 23);
+  do_check_eq(pb.getIntPref("int2"), -1236);
+  do_check_eq(pb.getCharPref("char1"), "_testPref");
+  do_check_eq(pb.getCharPref("char2"), "älskar");
+
+  // loading our former savePrefFile should allow us to read former prefs
+  ps.readUserPrefs(savePrefFile);
+  // cleanup the file now we don't need it
+  savePrefFile.remove(false);
+  do_check_eq(ps.getBoolPref("ReadPref.bool"), true);
+  do_check_eq(ps.getIntPref("ReadPref.int"), 230);
+  do_check_eq(ps.getCharPref("ReadPref.char"), "hello");
+
+  // ... and still be able to access "prior-to-readUserPrefs" preferences
+  do_check_eq(pb.getBoolPref("bool1"), true);
+  do_check_eq(pb.getBoolPref("bool2"), false);
+  do_check_eq(pb.getIntPref("int1"), 23);
+
+  //**************************************************************************//
+  // preference Observers
+
+  // an observer...
+  var observer = {
+    QueryInterface: function QueryInterface(aIID) {
+      if (aIID.equals(Ci.nsIObserver) ||
+          aIID.equals(Ci.nsISupports))
+         return this;
+      throw Components.results.NS_NOINTERFACE;
+    },
+
+    observe: function observe(aSubject, aTopic, aState) {
+      do_check_eq(aTopic, "nsPref:changed");
+      do_check_eq(aState, "ReadPref.int");
+      do_check_eq(ps.getIntPref(aState), 76);
+      ps.removeObserver("ReadPref.int", this);
+
+      // notification received, we may go on...
+      do_test_finished();
+    }
+  }
+
+  pb2.addObserver("ReadPref.int", observer, false);
+  ps.setIntPref("ReadPref.int", 76);
+
+  // test will continue upon notification...
+  do_test_pending();
+
+  // removed observer should not fire
+  pb2.removeObserver("ReadPref.int", observer);
+  ps.setIntPref("ReadPref.int", 32);
+
+  // let's test observers once more with a non-root prefbranch
+  pb2.getBranch("ReadPref.");
+  pb2.addObserver("int", observer, false);
+  ps.setIntPref("ReadPref.int", 76);
+
+  // test will complete upon notification...
+  do_test_pending();
+}