how to set the userPrincipal() to null in java junit

Question

i want to set the UserPrincipal() to null from junit of my application. For that i have tried to set the request to null but i got null pointer exception. Please help me to resolve the problem. Below is my code

if(request.getUserPrincipal()!=null){
     username=request.getUserPrincipal().getName();
}

i want to get the condition false.

Answer 1

i have found the solution...

get MockHttpServletRequest from junit and set userprinciple to null

MockHttpServletRequest httpServletRequest = new MockHttpServletRequest();
httpServletRequest.setUserPrincipal(null);