How do I properly Unit Test Spring Boot Reactive app with Kotlin & Kotest

Question

I'm fairly new to Kotlin and Kotest, been scratching my head on how to properly unit test webflux application. Looking over kotest samples here, to me that looks like it's spinning up a WebTestClient server and is more like integration test(please correct me if I'm wrong).

My app is fairly simple, I have a rest controller that I'm using constructor injecting to inject my service.

This service uses WebClient to call a different external service that returns a Mono<MyResponse>. And my test looks something like so:

@SpringBootTest
class MyControllerTest : FunSpec({
  lateinit var service: MyService
  lateinit var controller: MyController

  beforeTest {
    service = mockk()
    controller = MyController(service)
  }

  test("should return my response") {
     val myResponse = MyResponse(name = "John Doe")

     every { service.getName(any()) } returns Mono.just(myResponse)

     val response = controller.getName()
     
     verify { service.getName(any()) }
    
     response shouldBe myResponse
   }
})

The error I'm getting is:

expected: MyResponse(name = "John Doe")
actual: Monojust