clickButton("phone:ok");
clickButton("form:ok");
    public void testInvalidSerialNumber() {        clickLink("NewPhone");        // no digits        clickButton("phone:ok");        SiteTestHelper.assertUserError(tester);        // wrong chars and wrong number        setFormElement("serialNumber", "x");        clickButton("phone:ok");        SiteTestHelper.assertUserError(tester);        // 12 digits, but not valid chars        setFormElement("serialNumber", "123456789abx");        clickButton("phone:ok");        SiteTestHelper.assertUserError(tester);        // 16 correct digits - is OK - we accept 12 or more now        setFormElement("serialNumber", "123456789abcdef");        clickButton("phone:ok");        SiteTestHelper.assertNoUserError(tester);        SiteTestHelper.home(getTester());        clickLink("NewPhone");        // finally got it right        setFormElement("serialNumber", "123456789abc");        clickButton("phone:ok");        SiteTestHelper.assertNoUserError(tester);    }