@Test
public void shouldFindCustomer() {

  when(restTemplate.getForEntity(CUSTOMER_SERVICE_URL, Customer.class, CUSTOMER_ID))
          .thenReturn(new ResponseEntity<>(HttpStatus.OK));
  proxy.verifyCustomerCustomerId(CUSTOMER_ID);
  verify(restTemplate).getForEntity(CUSTOMER_SERVICE_URL, Customer.class, CUSTOMER_ID);
}