<Mock return on a static extension method in Kotli...

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Mock return on a static extension method in Kotlin
How do I force a mocked return on a static extension method in Kotlin?
I have a data class called Job
data class Job(
val id: ObjectId) {
}

and a Mapper object with an extension method that's static for the Job class.
object Mapper {
Job.toOtherJob(): OtherJob.Job {
// Do work
}
}


The issue is that toOtherJob method calls the real one, and I cannot force a doReturn on it.
Test class
class ServiceTests {
@Mock
private val job: Job? = null

@BeforeAll
fun...