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Test Info:

/* Any copyright is dedicated to the Public Domain.
function run_test() {
const PREF_NAME = "testPref";
var prefs = Services.prefs.getDefaultBranch(null);
var userprefs = Services.prefs.getBranch(null);
prefs.setCharPref(PREF_NAME, "test0");
prefs.lockPref(PREF_NAME);
Assert.equal("test0", userprefs.getCharPref(PREF_NAME));
Assert.equal(false, userprefs.prefHasUserValue(PREF_NAME));
var file = do_get_profile();
file.append("prefs.js");
Services.prefs.savePrefFile(file);
prefs.unlockPref(PREF_NAME);
prefs.setCharPref(PREF_NAME, "test1");
Services.prefs.readUserPrefsFromFile(file);
Assert.equal("test1", userprefs.getCharPref(PREF_NAME));
Assert.equal(false, userprefs.prefHasUserValue(PREF_NAME));
}