NullOrUnitWasNotCalled.kt

import io.mockk.Called
import io.mockk.every
import io.mockk.mockk
import io.mockk.verify
import org.junit.jupiter.api.Test
import java.util.function.Consumer
import java.util.function.Supplier

class NullOrUnitWasNotCalled {
  @Test
  fun unitFnWasNotCalled() {
    val consumer: Consumer<String> = mockk(relaxUnitFun = true)

    verify { consumer.accept(any()) wasNot Called }
  }

  @Test
  fun nullFnWasNotCalled() {
    val supplier: Supplier<String?> = mockk()

    verify { supplier.get()?.wasNot(Called) }
  }
}

java.lang.AssertionError: Verification failed: call 1 of 1: Consumer(#7).accept(any())) was not called

java.lang.AssertionError: Verification failed: call 1 of 1: Supplier(#4).get()) was not called