在Java接口中模拟方法时遇到Mockito问题
在Java接口中模拟方法时遇到Mockito问题
提问于 2022-05-18 16:43:32
在使用Junit5和Mockito3.8模拟Java接口中的方法时，我遇到了一些问题。考试失败的原因是：
Wanted but not invoked:
remoteCommands.getServiceStatus("ABC");
-> at com.acme.CommandHandlerTest.testServiceName(CommandHandlerTest.java:40)
Actually, there were zero interactions with this mock.它在CommandHandlerTest.java的第40行失败了
verify(remoteCommands).getServiceStatus(serviceName);但是，当我调试代码时，我可以看到正在执行的方法，因此我知道与该方法有1次交互，但是Mockito无法识别它。
如果我遗漏了什么，你能告诉我吗？我的代码文件如下，
CommandHandlerTest.java
package com.acme;
import static org.mockito.ArgumentMatchers.eq;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.when;
import java.rmi.RemoteException;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;
import org.mockito.Mock;
import org.mockito.MockitoAnnotations;
import org.mockito.junit.jupiter.MockitoExtension;
@ExtendWith(MockitoExtension.class)
public class CommandHandlerTest {
private CommandHandler commandHandler;
@Mock
IRemoteCommandsImpl remoteCommands;
@BeforeEach
void setup() {
MockitoAnnotations.openMocks(this);
}
@Test
void testDoCommand_serviceName() throws RemoteException {
commandHandler = new CommandHandler();
String serviceName = "ABC";
int mockValue = 4000;
when(remoteCommands.getServiceStatus(eq(serviceName))).thenReturn(mockValue);
commandHandler.printServiceStatus(serviceName);
verify(remoteCommands).getServiceStatus(serviceName);
}
}CommandHandler.java
package com.acme;
public class CommandHandler {
private IRemoteCommands remoteCommands;
public CommandHandler(){
}
public void printServiceStatus(String service) {
remoteCommands = new IRemoteCommandsImpl();
int serviceStatus = 0;
try {
serviceStatus = remoteCommands.getServiceStatus(service);
System.out.println("CommandHandler->serviceStatus: "+serviceStatus);
} catch (Exception e) {
e.getMessage();
}
}
}IRemoteCommands.java
package com.acme;
import java.rmi.Remote;
import java.rmi.RemoteException;
public interface IRemoteCommands extends Remote
{
public int getServiceStatus(String serviceName) throws RemoteException;
}IRemoteCommandsImpl.java
package com.acme;
import java.rmi.RemoteException;
public class IRemoteCommandsImpl implements IRemoteCommands{
@Override
public int getServiceStatus(String serviceName) throws RemoteException {
return 1000;
}
}回答 1
Stack Overflow用户
回答已采纳
发布于 2022-05-19 07:38:33
在CommandHandler中，创建一个新的IRemoteCommandsImpl实例并将其分配给私有remoteCommands字段。
这意味着被模拟的remoteCommands不会被被测试的对象使用。
您需要重构代码并将remoteCommands提供给CommandHandler，最好是通过构造函数：
public class CommandHandler {
private final IRemoteCommands remoteCommands;
public CommandHandler(IRemoteCommands remoteCommands) {
this.remoteCommands = remoteCommands;
}
// ...
}最重要的是：
如果使用MockitoExtension，则不需要MockitoAnnotations.openMocks(this);。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/72293034
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