运行下面的测试时出现错误。

@ExtendWith(MockKExtension::class)
class SenderServiceTest {

   @MockK
   lateinit var kafkaService: KafkaService<KeyType, MessageType>

   @Test
   fun `Send message`() {
      val key = KeyType()
      val value = MessageType()
      verify(kafkaService).send(key, value)
   }
}

@Service
@ConditionalOnProperty(name = ["kafka.enabled"])
class KafkaService<K, V>(val producerFactory: ProducerFactory<K, V>, val names: KafkaNames) {

   fun send(key: K, value: V) {
     // some code to send the message.
   }

}

错误是

org.mockito.exceptions.misusing.NotAMockException: 
Argument passed to verify() is of type KafkaService and is not a mock!
Make sure you place the parenthesis correctly!

我不知道为什么它说模拟豆不是模拟豆。有人能帮忙弄清楚吗？