public void testAsBodyTagWithExistingMessagesAttribute() throws Exception {
String existingAttribute = "something";
getPageContext().setAttribute(ErrorsTag.MESSAGES_ATTRIBUTE, existingAttribute);
Errors errors = new BeanPropertyBindingResult(new TestBean(), "COMMAND_NAME");
errors.rejectValue("name", "some.code", "Default Message");
errors.rejectValue("name", "too.short", "Too Short");
exposeBindingResult(errors);
int result = this.tag.doStartTag();
assertEquals(BodyTag.EVAL_BODY_BUFFERED, result);
assertNotNull(getPageContext().getAttribute(ErrorsTag.MESSAGES_ATTRIBUTE));