我的java代码：

@Override
public void initConnection(WebSocketSession session) {
    JSch jSch = new JSch();
    SshConnectInfo sshConnectInfo = new SshConnectInfo();
    sshConnectInfo.setJSch(jSch);
    sshConnectInfo.setWebSocketSession(session);
    String uuid = String.valueOf(session.getAttributes().get(ConstantPool.USER_UUID_KEY));
    sshMap.put(uuid, sshConnectInfo);
}

我的测试类：

public class WebSshServiceImplTest {
private WebSshServiceImpl webSshService;

@Before
public void setUp() throws Exception 
{ 
MockitoAnnotations.initMocks(this);
this.webSshService = new WebSshServiceImpl(20);
}
@Mock
ConcurrentMap<String, Object> sshMap = new ConcurrentHashMap<>();

@Test
public void initConnectionSuccess() throws Exception{
    WebSocketSession session = mock(WebSocketSession.class);
    session.getAttributes().put(ConstantPool.USER_UUID_KEY,"asdfgh");
    SshConnectInfo sshConnectInfo = new SshConnectInfo();
    doReturn(sshConnectInfo).when(sshMap).put("asdfgh",sshConnectInfo);
    webSshService.initConnection(session);
   verify(sshMap,times(1)).put("asdfgh",sshConnectInfo);
}

当我运行此测试用例时，由于以下错误而失败

Wanted but not invoked:
sshMap.put(
    "asdfgh",
    SshConnectInfo(webSocketSession=null, jSch=null, channel=null)
);
-> at com.extremecloudiq.websshserver.service.WebSshServiceImplTest.initConnectionSuccess(WebSshServiceImplTest.java:48)
Actually, there were zero interactions with this mock.

有人能帮帮我吗？我试过自动装配serviceimpl，但它抛出空指针异常。不知道在代码中要修改什么。