Hands-On Reactive Programming in Spring 5

Verifying reactive context

Finally, the most uncommon verification is that of the Reactor's Context. We covered the role and mechanics of Context in Chapter 4, Project Reactor - the Foundation for Reactive Apps. Let's assume that we want to verify the reactive API of the authentication service. In order to authenticate a user, LoginService expects that a subscriber will provide a Context that holds the authentication information:

StepVerifier   .create(securityService.login("admin", "admin"))
   .expectSubscription()
   .expectAccessibleContext()
   .hasKey("security")
   .then()
   .expectComplete()
   .verify();

In the preceding code, we can see how to check whether there is an accessible Context instance. We can see that there is only one case in which the ...