Mono.then() 在测试中未执行

Question

I'm trying to test the following code using integration tests:

return ((Mono<Object>) joinPoint.proceed()).then(provider.getAuthor().flatMap((author) -> {
            Arrays.stream(joinPoint.getArgs())
                    .forEach(arg -> javers.commitShallowDeleteById(author, InstanceIdDTO.instanceId(arg.toString(), deletedEntity)));
            return Mono.empty();
        }));

jointPoint.proceeed() Always returns a Mono<Void> so that's why i'm using then() .

When running the app in debug mode if i place a breakpoint inside the flatmap i can see it passes through there, however if i run it in a @SpringBootTest in no longer passes inside the flatmap.

Test configuration:

@DirtiesContext
@ActiveProfiles("test")
@RunWith(SpringRunner.class)
@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)

Provider: when(authorProvider.getAuthor()).thenReturn(Mono.just("Author"));

Answer 1

1. Maybe provider.getAuthor() returns no value (a Mono.empty() ) when you run your test?

   A flatMap needs a value to operate on. If there is no value, it won't be called. You can add a doOnComplete() call and see whether it is triggered when the sequence completes.

   Are the web application and the test running with the same data?

2. " Nothing happens until you subscribe "

   You can add a doOnSubscribe() call and see whether it is triggered and when, when running the test.