}
    public void testPersistNoChange()
    {
        MockControl sourceControl = newControl(CookieSource.class);
        CookieSource source = (CookieSource) sourceControl.getMock();
        MockControl requestControl = newControl(WebRequest.class);
        WebRequest request = (WebRequest) requestControl.getMock();
        MockControl tlc = newControl(ThreadLocale.class);
        ThreadLocale tl = (ThreadLocale) tlc.getMock();
        // Training
        source.readCookieValue(TapestryConstants.LOCALE_COOKIE_NAME);
        sourceControl.setReturnValue(null);
        request.getLocale();
        requestControl.setReturnValue(Locale.JAPANESE);