Hello. I am trying to mock a function `TaskProcess...

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Hello. I am trying to mock a function TaskProcessor.start(job: Job) and verify argument with which it has been invoked.

val argumentCaptor: ArgumentCaptor<Job> = ArgumentCaptor.forClass(Job::class.java)
Mockito.verify(mockTaskProcessor).start(argumentCaptor.capture())

That gives me an IllegalStateException when run, because Mockito is using null as an mock arguments, and that obviously is against Kotlin's safety policy. I could relax function definition TaskProcessor.start(job: Job?) but I'm loosing all Kotlin's advantage in terms of null safety. What would be the best method to capture and verify mocked arguments?