java - Mockito:监视构造函数内的调用 (Java)

Question

这个问题已经有答案了:

Test class with a new() call in it with Mockito (7 个回答)

已关闭 5 年前。

这不是 Test class with a new() call in it with Mockito 的重复项。我正在尝试编写一个测试来验证是否在我的 spy 对象 (mockToyFacade) 的构造函数中调用了某些方法。

被测试的类是ToyFactoryFacade。这个想法是客户端与 ToyFactoryFacade(它包装了 ToyFactory)交互以生成 ToyFacades，ToyFacades 本身是 Toy 对象的包装器。

我想用 Mockito 验证什么？

我想验证 ToyFacade 上是否调用了 addToyName(toyName) 和 addCreationTime(creationTimestamp)。这两个方法都在 ToyFacade 的构造函数中调用。

有什么问题吗？

当我尝试监视 ToyFacade 并验证是否调用了上述两个方法时，我收到一条错误，其中显示“实际上，与此模拟的交互为零。”当我调用单独的方法(即不通过构造函数)，验证检查是否正确。 我不确定我做错了什么。

测试代码

public class ToyFactoryFacadeTest {
   private Toy mockToy;
   private ToyFacade mockToyFacade;
   // System under test.
   private ToyFactoryFacade toyFactoryFacade;
   private ToyFactory mockToyFactory;
   @Before
   public void setup() {
        mockToy = mock(Toy.class);
        mockToyFacade = spy(new ToyFacade(mockToy, "Phone", System.currentTimeMillis()));
        mockToyFactory = mock(ToyFactory.class);
        toyFactoryFacade  = new ToyFactoryFacade(mockToyFactory) {
            @Override
            public Toy getToyFacade(String toyName, long creationTimestamp){
                return mockToyFacade;
            }
        };  
    }

    @Test
    public void testToyFactoryFacade() {
        toyFactoryFacade.initializeAndGetToy("Phone", System.currentTimeMillis());
        verify(mockToyFacade).addToyName("Phone");
        verify(mockToyFacade).addCreationTime(anyLong());
    }
}

源代码

public class ToyFactoryFacade { 
    private final ToyFactory toyFactory;
    public ToyFactoryFacade(ToyFactory toyFactory) {
      this.toyFactory = toyFactory;
    }

    public ToyFacade initializeAndGetToy(String toyName, long creationTimestamp)
    {
        getToyFacade(toyName, creationTimestamp);
    }

    // For testing.
    protected ToyFacade getToyFacade(String toyName, long creationTimestamp 
    {
        return new ToyFacade(toyFactory.newToy(), toyName, creationTimestamp);
    }
}

public class ToyFactory {
    public Toy newToy() {
     return new Toy();
    }
} 

public class ToyFacade {
    private final Toy toy;
    public ToyFacade(Toy toy, String toyName, long creationTimeStamp) {
        this.toy = toy;
        addToyName(toyName);
        addCreationTime(creationTimestamp);
  }

    public void addToyName(String name) {
        toy.addToyName(toyName);
    }

    public void addCreationTime(long timestamp) {
        toy.addCreationTime(timestamp);
    }
}

public class Toy {
    public String toyName;
    public String creationTimestamp;
    public void addToyName(String name) {
        toyName = name;
    }

    public void addCreationTime(long timestamp) {
        creationTimestamp = timestamp;
    }
}

Answer 1

您的测试没有按照您的预期进行，因为您尝试验证的方法调用在您创建 spy 之前已经发生。您真正想做的是测试这两个方法调用的效果，而不是调用本身。这看起来像

verify(mockToy).addToyName("Phone");
verify(mockToy).addCreationTime(timestamp);

其中 timestamp 是您在 setUp 方法中传入的任何内容。