    @Test
    void test_registerRenter_noRenter_doesNotRegister() {

        final RegisterRenterController controller = new RegisterRenterController(
            new MockRegisterRenterInputPort());
        Renter renter = new Renter();
        renter.setFirstName("John");
        renter.setLastName("Doe");
        renter.setEmail("john.doe@email.com");
        final ResponseEntity<?> responseEntity = controller.registerRenter(null);
        Assertions.assertEquals(HttpStatus.BAD_REQUEST, responseEntity.getStatusCode());
    }