anchor.diff:  @Test
   @WithMockUser(roles="ADMIN")
   public void requestProtectedUrlWithUser() throws Exception {
  -  mvc
  -      .perform(get("/"))
  -      ...
  +mvc
  +	  .perform(get("/"))
  +	  ...
   }
   ----
   
  
positive.code: [source,java]
  ----
  mvc
      .perform(post("/").with(csrf().useInvalidToken()))
  ----
  
  [[test-mockmvc-securitycontextholder]]
  
negative.code: @WithMockUser("customUsername")
  public void getMessageWithMockUserCustomUsername() {
  	String message = messageService.getMessage();
  ...
  }
  ----
  
  