java - Mockito 验证单元测试 - 需要但未调用。事实上，与这个模拟的互动为零

Question

首先我想为我的英语感到抱歉。

我开始做一些单元测试(我以前从未这样做过，我是编程新手)。

我必须使用mockito.verify测试将产品添加到数据库(DynamoDB)的简单方法，但我有

"Wanted but not invoked. Actually, there were zero interactions with this mock." 

错误，我不知道该怎么办。

这是我的方法代码(在 KitchenService 类中):

public Product addProduct(Product content) {

    ObjectMapper objectMapper = new ObjectMapper();

    String mediaJSON = null;
    String authorJSON = null;
    String productKindsJSON = null;
    try {
        mediaJSON = objectMapper.writeValueAsString(content.getMedia());
        authorJSON = objectMapper.writeValueAsString(content.getAuthor());
        productKindsJSON = objectMapper.writeValueAsString(content.getProductKinds());
    } catch (JsonProcessingException e) {
        logger.log(e.getMessage());
    }


    Item item = new Item()
            .withPrimaryKey("id", UUID.randomUUID().toString())
            .with("name", content.getName())
            .with("calories", content.getCalories())
            .with("fat", content.getFat())
            .with("carbo", content.getCarbo())
            .with("protein", content.getProtein())
            .with("productKinds", productKindsJSON)
            .with("author", authorJSON)
            .with("media", mediaJSON)
            .with("approved", content.getApproved());


    Item save = databaseController.saveProduct(PRODUCT_TABLE, item);
    logger.log(save + " created");



    return content;

}

这是测试代码:

@Test
public void addProduct() throws Exception {


    KitchenService instance = mock(KitchenService.class);


    Product expectedProduct = new Product();
    expectedProduct.setName("kaszanka");
    expectedProduct.setCalories(1000);
    expectedProduct.setFat(40.00);
    expectedProduct.setCarbo(20.00);
    expectedProduct.setProtein(40.00);
    expectedProduct.setProductKinds(Collections.singletonList(ProductKind.MEAT));
    expectedProduct.setApproved(false);
    Author expectedAuthor = new Author();
    expectedAuthor.setId("testID");
    expectedAuthor.setName("Endrju Golota");
    expectedProduct.setAuthor(expectedAuthor);
    Media expectedMedia = new Media();
    expectedMedia.setMediaType(MediaType.IMAGE);
    expectedMedia.setName("dupajasia");
    expectedMedia.setUrl("http://blabla.pl");
    expectedProduct.setMedia(expectedMedia);

    verify(instance, times(1)).addProduct(expectedProduct);
}

这是我测试后得到的:

Wanted but not invoked:
kitchenService.addProduct(
    model.kitchen.Product@a0136253
);
-> at     service.kitchen.KitchenServiceTest.addProduct(KitchenServiceTest.java:80)
Actually, there were zero interactions with this mock.

有人可以告诉我我做错了什么吗？

Answer 1

您应该模拟和验证的是 databaseController 依赖项:

@Test
public void addProduct() throws Exception {

    KitchenService instance = new KitchenService(); // you should create the class under test

    DatabaseController controllerMock = mock(DatabaseController.class); // mock the controller

    instance.setController(controller); // inject the mock

    ...

    // Act
    instance.addProduct(expectedProduct);

    // Assert
    verify(controller).saveProduct(Mockito.eq(PRODUCT_TABLE), Mockito.any(Item.class));

}

您应该验证数据库是否在服务内被调用。检查是否使用任何 Item 对象调用数据库就足够了。