@Named
@Path(CUSTOMERS_PATH)
@Produces(MediaType.APPLICATION_JSON)
public class CustomerResourceImpl extends AbstractResource implements
      ICustomerResource

   ...

   @Override
   @POST
   @Consumes(MediaType.APPLICATION_JSON)
   public Response add(final CustomerDto pDto) {
      try {
         getService().add(pDto);
      } catch (final ValidationException ve) {
         badRequest(ve.getErrors());
      }

      return Response.ok().build();
   }

}

@Test
public void addTest() {
    final Response response = target(NameTokens.CUSTOMERS_PATH).request()
            .header("Content-Type", MediaType.APPLICATION_JSON)
            .post(Entity.entity(new CustomerDto(), MediaType.APPLICATION_JSON));

    Assert.assertNotNull(response, "Response cannot be null");
    Assert.assertEquals(response.getStatus(), Status.OK.getStatusCode(),
            "Response status code isn't ok");
}