@SpyBean not working with Pact and JUnit 5

Question

I'm trying to use the @SpyBean to mock a method of a @Component and doesn't work. @MockBean works (followed the example). I've tried, read and researched many ways but couldn't make it work.

Here's the example:

@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment. DEFINED_PORT)
@ExtendWith(SpringExtension::class)
@Provider("MyMicroService")
@PactFolder("../../../pacts")
internal class ClientContracts {

    @SpyBean
    private lateinit var myService: MyService

    @TestTemplate
    @ExtendWith(PactVerificationInvocationContextProvider::class)
    fun pactVerificationTestTemplate(context: PactVerificationContext) {
        context.verifyInteraction()
    }

    @State("default", "NO_DATA")
    fun toDefaultState() {
        reset(processService)
    }
}

(I super simplified the test function so it's easier to read, I'd be actually doing doReturn(...).when(...).blah())

I'm always getting the "not a mock" error, because the object is always the bean wrapped by Spring CGLIB:

org.mockito.exceptions.misusing.NotAMockException: Argument should be a mock, but is: class com.blah.MyServiceImpl$$EnhancerBySpringCGLIB$$9712a2a5
    at com.nhaarman.mockitokotlin2.MockitoKt.reset(Mockito.kt:36)
...

I've tried:

• with @SpringJUnitConfig
• with a separate @TestConfiguration, but got resolved to same above bean
• Using Mockito.initAnnotations(this) in a @BeforeEach
• and more, I've tried with so many combinations that I can't remember...

Is there something that I'm missing? Or an option that I don't know?

Answer 1

1. Above issue is not related to the pact or pact JVM library
2. The issue is not about spring
   • Spring - I use spring with mockito and it works, the simple example is:

import com.nhaarman.mockito_kotlin.doReturn
import org.junit.jupiter.api.Test
import org.junit.jupiter.api.extension.ExtendWith
import org.springframework.boot.test.context.SpringBootTest
import org.springframework.boot.test.mock.mockito.SpyBean
import org.springframework.test.context.junit.jupiter.SpringExtension

@ExtendWith(value = [SpringExtension::class])
@SpringBootTest(
 webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT,
 classes = [Application::class]
)
internal class processorIntegrationTest : IntegrationTest() {

 @SpyBean
//    @MockBean
 private lateinit var processor: Processor;

 @Test
 internal fun abcd() {
     doReturn("something").`when`(processor).get()

     val get = processor.get()
     assertThat(get).isEqualTo("something")
 }
}

3. Mockito - mockito_kotlin or mockito extension works with SpyBean

4. Issue is about mockito + CGLIB

   • CGLIB - from your logs feels like class com.blah.MyServiceImpl$$EnhancerBySpringCGLIB$$9712a2a5 there is a wrapper on top of your service implementation which is SpyBean. Which means CGLIB wrapper is not and the error is for that. Try removing CGLIB wrapper and it will work