How to test that method sussessfully using Junit?

public String create() {
    request.setAttribute(CommonConstants.PAGE_ID.toString(),
            ApplicationConstants.ADD_ATTRIBUTE_PAGE.toString());
    request.setAttribute(CommonConstants.SCREEN_ID.toString(),
            ApplicationConstants.ADD_ATTRIBUTE_PAGE.toString());
    return SUCCESS;
}

/CommonConstants,ApplicationConstants are enum. "request" is object of HttpServletRequest/`

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