Using StepVerifier to test async Publisher

StepVerifier.kt

@Test
fun `should return person data given name of the person`(){
  val monoPerson = PersonManager.getProfile("PersonX")
  val expectedResult = Person(name = "PersonX", age = 18)
  
  StepVerifier.create(monoPerson)
   .expectNext(expectedResult)
   .verifyComplete()
}

@Test
fun `should return list of person data`(){
  val fluxList = PersonManager.getAllProfile()
  
  StepVerifier.create(fluxList)
   .expectNext(Person(name = "PersonX", age = 18))
   .expectNext(Person(name = "PersonY", age = 20))
   .verifyComplete()
}

@Test
fun `should wait for 12 second`() {
  StepVerifier.withVirtualTime { Mono.delay(Duration.ofSeconds(12)) }
            .thenAwait(Duration.ofSeconds(12))
            .expectNextCount(1)
            .expectComplete()
            .verify()
}