如何解决“要创建新的模拟，必须注销现有的模拟注册”

Question

尝试模拟静态方法时出现以下异常：

org.mockito.exceptions.base.MockitoException：对于 de.msggillardon.system.UserContext，静态模拟已在当前线程中注册要创建新的模拟，必须取消注册现有的静态模拟注册

对于以下代码：

 @ExtendWith(MockitoExtension.class)
// @PrepareForTest(UserContext.class)
public class KonfigurationCopyServiceTest {

  public static final String CONFIGURATION_NAME = "Standard-Konfiguration";

  @Mock
  public TriggeringKonfigurationService triggeringKonfigurationService;
  @Mock
  public ReportKonfigService reportConfigurationService;
  @Mock
  public BuchungsschemaService buchungsschemaService;

  public KonfigurationCopyService copyService;

  @BeforeEach
  public void init() {
    Mockito.mockStatic(UserContext.class);
    Mockito.when(UserContext.getUsername()).thenReturn("superuser");

    copyService = new KonfigurationCopyService(triggeringKonfigurationService,
        reportConfigurationService, buchungsschemaService);
  }

有人可以帮忙吗？

谢谢你！

编辑：UserContext.java

package de.msggillardon.system;

/**
 * This class contains the username and IP-address of the logged in user. It is initialized for each
 * session.
 *
 * @author wildp
 */
public class UserContext {

  private static final ThreadLocal<UserContext> userContext = new ThreadLocal<>();

  private final String username;

  private final String clientIPAddress;

  /**
   * Constructor.
   *
   * @param username        Username of the user who is logged in
   * @param clientIPAddress IP Address of the user who is logged in
   */
  public UserContext(String username, String clientIPAddress) {
    this.username = username;
    this.clientIPAddress = clientIPAddress;
  }

  /**
   * Initializes the threadLocal
   *
   * @param userContext
   */
  public static void initialize(UserContext userContext) {
    UserContext.userContext.set(userContext);
  }

  /**
   * Removes the current thread's value for this thread-local variable.
   */
  public static void remove() {
    userContext.remove();
  }

  /**
   * Returns the username of the current thread.
   *
   * @return
   */
  public static String getUsername() {
    return userContext.get().username;
  }

  /**
   * Returns the IP address of the client of the current thread.
   *
   * @return
   */
  public static String getClientIPAddress() {
    return userContext.get().clientIPAddress;
  }

  public static UserContext getThreadLocalUserContext(){
    return userContext.get();
  }
}

新编辑：我再次编辑了我的代码，所以你现在可以看到，我正在使用 @ExtendWith(MockitoExtension.lass) 来模拟。

我还在网上发现了以下提示： https: //javadoc.io/static/org.mockito/mockito-core/3.4.3/org/mockito/MockedStatic.html 所以看来我必须做一个 MockedStatic.close( ）；也许作为 @AfterEach 但当我尝试时它给了我例外

无法从 ScopedMock 类型对非静态方法 close() 进行静态引用

还是行不通 ：（

Answer 1

这对我有用：

  private MockedStatic<UserContext> mockStatic;

  @BeforeEach
  public void beforeEach() {
    mockStatic = Mockito.mockStatic(UserContext.class);
  }

  @AfterEach
  public void afterEach() {
    mockStatic.close();
  }

Answer 2

因此，当我使用 Junit 5 时，我无法使用 @Before Annotation，因此我将 @BeforeEach 替换为 @BeforeAll。所以我做了如下：

1. 步骤：导入

import static org.junit.jupiter.api.TestInstance.Lifecycle.PER_CLASS;

2. 步骤：添加 @TestInstance(PER_CLASS) 注释（在课程之前）

3. 步骤：@BeforeAll 而不是 @BeforeEach

这解决了我的问题。