@Test
 public void testSerializationDeserialization() throws IOException {
   ErrorDetail detail =
       new AdapterUnauthorizedErrorDetail("Unauthorized adapter access", "vdr", "Basic");
   HttpError error = new HttpError(401, "Unauthorized", detail);
   String jsonError = mapper.writeValueAsString(error);
   System.out.println(jsonError);
   Assert.assertTrue(
       "Serialization should be successful",
       jsonError.contains("Unauthorized") && jsonError.contains("Basic"));
   HttpError readError = mapper.readValue(jsonError, HttpError.class);
   Assert.assertEquals(
       "Deserialization of the HttpError should be successful",
       "Unauthorized",
       readError.getMessage());
   Assert.assertEquals(
       "Deserialization of the AdapterUnauthorizedErrorDetail should be successful",
       "Basic",
       ((AdapterUnauthorizedErrorDetail) readError.getDetails().get(0)).getAuthorization());
 }