tag.setValue("person/create.jsp");
tag.doStartTag();
// adding param must be done after doStartTag()
Include include = (Include) tag.getComponent();
include.addParameter("user", "Santa Claus");
tag.doEndTag();
controlRequestDispatcher.verify();
assertEquals("/person/create.jsp?user=Santa+Claus", request.getRequestDispatherString());
assertEquals("", writer.toString());