response = target.resolveTemplate("param", "with").request().get();
assertNotNull("Response is null.", response);
assertEquals("Unexpected response status.", 200, response.getStatus());
assertEquals("Unexpected response entity.", "1234567890", response.readEntity(String.class));
response = target.resolveTemplate("param", "without").request().get();
assertNotNull("Response is null.", response);
assertEquals("Unexpected response status.", 204, response.getStatus());
assertFalse("Unexpected non-empty response entity.", response.hasEntity());
}