Hands-On Reactive Programming in Spring 5

Testing Controllers with WebTestClient 

Imagine that we test a Payment service. In this scenario, suppose that the Payment service supports the GET and POST methods for the /payments endpoint. The first HTTP call is responsible for retrieving the list of executed payments for the current user. In turn, the second makes it possible to submit a new payment. Implementation of that rest controller looks like the following:

@RestController
@RequestMapping("/payments")
public class PaymentController {
   private final PaymentService paymentService;   public PaymentController(PaymentService paymentService) {       this.paymentService = paymentService; } @GetMapping("/") public Flux<Payment> list() { return paymentService.list(); } @PostMapping("/") public ...