private MockHttpServletResponse response = new MockHttpServletResponse();
@Test
public void testHandleWithJson() throws Exception {
request.addHeader("Accept", MediaType.APPLICATION_JSON_VALUE);
handler.handle(request, response, new AccessDeniedException("Bad"));
assertEquals(HttpServletResponse.SC_FORBIDDEN, response.getStatus());
assertEquals(MediaType.APPLICATION_JSON_VALUE, response.getContentType());
assertEquals(null, response.getErrorMessage());
}