我使用会话注册表来维护单个会话。
代码如下：

@Component
public class AppLogout implements LogoutSuccessHandler{

@Autowired
private SessionRegistry sessionRegistry

...

List<SessionInformation> sessions = sessionRegistry.getAllSessions(auth.getPrincipal(), false)

现在，每当我试图为此编写测试用例时，我都会得到 NullPointerException 在第二行 sessionRegistry 或者不是模拟例外。
尝试过的事情：
无法在sessionregistry上执行InjectMock，因为它是一个接口

@Mock
SessionRegistry sg;

@InjectMocks
SessionRegistryImpl sgImpl

使用 @Mock 导致 NullPointerException ```
@Mock
SessionRegistry sg

Mockito.doReturn(list).when(sg).... (NullPointer on sg)

完全删除模拟，但仍然打开空指针 `sessionRegistry.getAllSessions(...)` 实际等级：

@Component
public class AppLogoutHandler implements LogoutSuccessHandler{

@Autowired
SessionRegistry sessionRegistry;

@Override
public void onLogoutSuccess(HttpServletRequest request, HttpServletResponse response, Authentication authentication)
        throws IOException, ServletException {

    if(authentication != null && authentication.getDetails() != null) {
        removeAuthSession(authentication, sessionRegistry);
        request.getSession().invalidate();
    }

}

private void removeAuthSession(Authentication authentication, SessionRegistry sessionRegistry2) {

    List<SessionInformation> session= sessionRegistry.getAllSessions(authentication.getPrincipal(), false); //sessionRegistry here is giving issue

    if(!session.isEmpty()) {
        ....
    }
}

}

测试类（这是最新版本，也尝试了第1,2点中提到的内容）

@RunWith(SpringRunner.class)
@SpringBootTest
public class AppLogoutSuccessHandlerTest {

@MockBean
SessionRegistry registry;

@InjectMocks
AppLogoutHandler appLogoutHandler;

@org.junit.Before
public void setup() {
MockitoAnnotations.initMocks(this); 
}

@Test
public void onLogoutSuccessTest() {
    //Mocked ServletRequest, Response here
    Object object = new Object();
    List<SessionInformation> informations = new ArrayList<SessionInformation>();
    //informations.add(sessionInformation); SessionInformation is created above and passed

    Mockito.doReturn(informations).when(registry).getAllSessions(object, false); //If i include this line it gives not a mock on when and if i doesn't then it is giving nullPointer on actual class

}

}

更新的测试用例（这在执行时为line->sessionregistry.getallsessions（authentication.getprincipal（），false）提供空指针）

@RunWith(MockitoJUnitRunner.class)
public class AppLogoutSuccessHandlerTest {

@Mock
SessionRegistry registry;

@InjectMocks
AppLogoutHandler appLogoutHandler;

/*
 * @org.junit.Before public void setup() { MockitoAnnotations.initMocks(this); }
 */

@Test
public void onLogoutSuccessTest() {
    //Mocked ServletRequest, Response here
    Object object = new Object();
    List<SessionInformation> informations = new ArrayList<SessionInformation>();
    //informations.add(sessionInformation); SessionInformation is created above and passed

    Mockito.doReturn(informations).when(registry).getAllSessions(object, false); //If i include this line it gives not a mock on when and if i doesn't then it is giving nullPointer on actual class

}

}

我试过注解 `@SpringBootTest` 没有它，就没有运气。
你能建议一下上述方法有什么问题吗。