Hello, I'm trying to integrate Kotest with Spring...

# kotest

[Szymon Jeziorski]

Hello,

I'm trying to integrate Kotest with SpringBoot and SpringMockK for veryfing bean calls via @SpykBean, but cannot get it working.

my setup looks roughly like this:

@SpringBootTest
class SomeTestClass(
 [...]
) : FunSpec() {
    @SpykBean
    private lateinit var someService: SomeService

    init {
        test("some test") {
            [...]
            verify { someService.someMethod(someArg) } // ERROR here
        }
    }
}

Test breaks when hitting verify block with beginning of the stack trace looking as follows:

java.lang.NoClassDefFoundError: io/mockk/ValueClassSupportKt
	at io.mockk.impl.instantiation.JvmMockFactoryHelper.toDescription$mockk(JvmMockFactoryHelper.kt:150)
	at io.mockk.impl.instantiation.JvmMockFactoryHelper$mockHandler$1.invocation(JvmMockFactoryHelper.kt:25)
	at io.mockk.proxy.jvm.advice.Interceptor.call(Interceptor.kt:21)

I tried using MockKAnnotations.init(), @ExtendWith(MockKExtension::class), moving @SpykBean to companion object, but nothing helped.
Have anyone had such issue or could think of a solution?
Thanks in advance

[Emil Kantis]

is someArg a value class? IIRC there's issues with value classes in MockK still. The problem sounds unrelated to kotest

[Szymon Jeziorski]

No, someArg is Java class coming from generated resources in my case, but looks like the issue is with spy object itself, not with passed arguments. Verifying no-args method call results in same issue.

Example with simple Spring's bean:

@RestController
class SomeController {
    @GetMapping("/test")
    fun something() = "something"
}

@SpringBootTest
class SomeTestClass(
 [...]
) : FunSpec() {
    @SpykBean
    private lateinit var someController: SomeController

    init {
        test("some test") {
            [...]
            verify { someController.something() } // ERROR here
        }
    }
}

Taking a look at the spy property within test class and intercepted MockK call within debug looks as attached.

Looks like issue on the MockK site, but this wasn't a case with JUnit, so not sure what I'm missing.
(Hidden base package names in screenshots)

[Szymon Jeziorski]

message has been deleted

[Szymon Jeziorski]

message has been deleted

[Szymon Jeziorski]

After some digging turned out issue was indeed on MockK's site, overriding transitive SpringMocK's MockK version to latest resolved the issue :)