Questions

1. Why is it important to know how to develop reactive microservices?
2. How do you choose between non-blocking synchronous APIs and event/message-driven asynchronous services?
3. What makes a message different from an event?
4. Name some challenges with message-driven asynchronous services. How do we handle them?
5. Why is the following test failing?

    @Test
    public void TestFlux() {

        List<Integer> list = new ArrayList<>();

        Flux.just(1, 2, 3, 4)
            .filter(n -> n % 2 == 0)
            .map(n -> n * 2)
            .log();

        assertThat(list).containsExactly(4, 8);

6. What are the challenges of writing tests with reactive code using JUnit, and how can we handle them?