我正在使用EasyMock与Kotlin。有一个示例类，我尝试模仿。
我不断收到的问题是，anyObject，无论是否有特定的类，都会抛出NullPointerException，因为Kotlin在类型方面比Java更严格。
java.lang.NullPointerException：anyObject（Logger：：class.java）不能为null
下面是我使用简单类实现运行的测试示例。
基于EasyMock的测试MyServiceMockTest.kt：

import org.easymock.EasyMock.anyObject
import org.easymock.EasyMock.anyString
import org.easymock.EasyMock.replay
import org.easymock.EasyMock.verify
import org.easymock.EasyMockExtension
import org.easymock.Mock
import org.junit.jupiter.api.BeforeEach
import org.junit.jupiter.api.Test
import org.junit.jupiter.api.extension.ExtendWith
import org.slf4j.Logger
@ExtendWith(EasyMockExtension::class)
class MyServiceMockTest {
    @Mock
    private lateinit var loggerService: LoggerService
    private lateinit var myService: MyService
    @BeforeEach
    fun setUp() {
        myService = MyService(loggerService)
    }
    @Test
    fun `should test logger implementation`() {
        loggerService.info(anyObject(Logger::class.java), anyString())
        replay(loggerService)
        myService.`generate different logs based on incoming numbers`(0)
        verify(loggerService)
    }
}

字符串
MyService.kt:

import org.slf4j.LoggerFactory
import org.springframework.beans.factory.annotation.Autowired
import org.springframework.stereotype.Service
@Service
class MyService @Autowired constructor(val loggerService: LoggerService) {
    private val logger = LoggerFactory.getLogger(MyService::class.java)
    companion object {
        const val BREADCRUMB_ID = "fd8f6ac2-8d27-11ee-b9d1-0242ac120002"
    }
    fun `generate different logs based on incoming numbers`(num: Int) {
        when (num) {
            0 -> 
                loggerService.info(
                    logger = logger,
                    breadcrumbId = BREADCRUMB_ID
                )
            1 ->
                loggerService.info(
                    logger = logger,
                    breadcrumbId = BREADCRUMB_ID,
                    events = listOf("Log a single message")
                )
            2 ->
                loggerService.info(
                    logger = logger,
                    breadcrumbId = BREADCRUMB_ID,
                    events = listOf("Log a message"),
                    params = mapOf("num" to num)
                )
            3 ->
                loggerService.warn(
                    logger = logger,
                    breadcrumbId =  BREADCRUMB_ID,
                    params = mapOf("num warnings" to num)
                )
            else -> {
                loggerService.info(
                    logger = logger,
                    breadcrumbId = BREADCRUMB_ID
                )
                loggerService.warn(
                    logger = logger,
                    breadcrumbId = BREADCRUMB_ID
                )
                loggerService.error(
                    logger = logger,
                    breadcrumbId = BREADCRUMB_ID
                )
            }
        }
    }
}

型
LoggerService.kt:

import org.slf4j.Logger
import org.springframework.boot.logging.LogLevel
import org.springframework.boot.logging.LogLevel.ERROR
import org.springframework.boot.logging.LogLevel.INFO
import org.springframework.boot.logging.LogLevel.WARN
import org.springframework.stereotype.Service
/**
 * As this LoggerService unique per service,
 * be it one of the services in a monolith
 * or one of isolated services in microservice architecture
 * it has an extra field <code>breadcrumbId</code>, so
 * all the messages can be traced by this ID.
 */
@Service
open class LoggerService {
    fun info(logger: Logger, breadcrumbId: String, events: List<Any>? = null, params: Map<Any, Any?>? = null) {
        log(INFO, logger, breadcrumbId, events, params)
    }
    fun error(logger: Logger?, breadcrumbId: String?, events: List<Any>? = null, params: Map<Any, Any?>? = null) {
        log(ERROR, logger!!, breadcrumbId!!, events, params)
    }
    fun warn(logger: Logger, breadcrumbId: String, events: List<Any>? = null, params: Map<Any, Any?>? = null) {
        log(WARN, logger, breadcrumbId, events, params)
    }
    /**
     * The implementation is limited, it does not include TRACE, DEBUG modes.
     */
    private fun log(level: LogLevel, logger: Logger, breadcrumbId: String, events: List<Any>? = null, params: Map<Any, Any?>? = null) {
        /**
         * Builder behavior mimics MDC Logger.
         * It allows to have a greater flexibility, than some other available solutions.
         */
        val message = LogMessage(breadcrumbId)
            .addParams("events", events)
            .addParams("params", params)
            .build()
        when (level) {
            ERROR -> logger.error(message)
            WARN -> logger.warn(message)
            else -> logger.info(message)
        }
    }
}
/**
 * The implementation of this class can be further extended.
 *
 * Here is a simple reference implementation that can be used as it is.
 */
open class LogMessage {
    private val builder: StringBuilder
    constructor(breadcrumbId: String){
        builder = StringBuilder("[$breadcrumbId]")
    }
    fun addParams(name: Any, value: Any?): LogMessage {
        if (value != null) {
            builder.append(", $name: $value")
        }
        return this
    }
    fun build(): String {
        return builder.toString()
    }
}

型
我以前在anyString上也遇到过类似的问题，但是通过anyString的函数扩展解决了这个问题，但是对于anyObject，我无法提出类似的实现。
当前的测试是否有任何方法可以在没有NullPointerException的情况下使用函数或其他替代方案？