セッタータインジェクションの. The @Autowired annotation is performing Dependency Injection. Springで開発していると、テストを書くときにmockを注入したくなります。. annotation @Inject⇨javax. class) @ContextConfiguration (loader = AnnotationConfigContextLoader. JUnitのテストの階層化と@InjectMocks. To solve it try to use the @Spy annotation in the field declaration with initializing of them and @PrepareForTest above the class declaration: @PrepareForTest (Controller. class)，. 摘要 “Mockito + springboot” 搞定UT用例的复杂场景数据模拟2. 首先创建一个类，交给spring管理import org. The root cause is, instead of using the auto-created bean maintained by the Spring IoC container (whose @Autowired field is indeed properly injected), I am new ing my own instance of that bean type and using it. Or in case of simply needing one bean initialized before another. This is the root cause, And then, we change the code like this: @RunWith(SpringRunner. 19. 3 Answers. 2. 10. In you're example when (myService. Difference between @Mock and @InjectMocks. I need to. springframwork. Or in case of simply needing one bean initialized before another. public class A() { @Autowired private B b; @Autowired private C c; @Autowired private D d; } Beim Testen sie mit autowiring 3 differnt Klassen verwendet, würde ich nur 2 der Klassen haben möchte (B & C) als Mocks und haben Klasse D. Difference Table. We call it ‘code under test‘ or ‘system under test‘. SpringExtension integrates the Spring TestContext Framework into JUnit 5's Jupiter programming model. 2. Into the configuration you will be able to mock your beans and also you must define all types of beans which you are using in. The @Mock annotation is an alternative to Mockito. println ("A's method called"); b. Here is a blog post that compares @Resource, @Inject, and @Autowired, and appears to do a pretty comprehensive job. setField in order to avoid making any modifications whatsoever to your code. 0I think the simple answer is not to use @InjectMocks, and instead to initialise your object directly. Return something for your Mock. xml file. This is a utility from Mockito, that takes the work. 创建一个 mock 对象。 使用 @InjectMocks 和 @Mock 配合能 mock 出被 Spring 容器托管的 bean，并自动注入到待测试类中。@Autowired したいクラスは、 @Component ではない @Component ではないクラスは Spring の管轄外なので @Autowired は効きません。 @Component されたクラスの名前が他と重複している. @Autowiredさせたいフィールドをもつクラスがhogeパッケージだとして以下の4通りの方法があります。. 被测类中被@autowired 或 @resource 注解标注的依赖对象，如何控制其返. 文章浏览阅读4. So when you try to access the 'str' using classA object it causes null pointer exception as classA is yet to be autowired. Mockito @Mock. So how will I get the value of this. @Autowired is Spring's annotation for autowiring a bean into a production, non-test class. public class A () { @Autowired private B b; @Autowired private C c; @Autowired private D d; } 在测试它们时，我只希望将其中两个类（B＆C）作为模拟，并让D类在正常运行时可以自动装配. You can use the magic of Spring's ReflectionTestUtils. e. 我有一个使用自动装配的3个不同类的A类. public class HogeService { @Autowired private HogeDao dao; //これをモックにしてテストしたい } JUnitでテストを階層化するやり方でよく知られているのは、Enclosed. class) public class DemoTest { @Mock private SomeService service; @InjectMocks private Demo demo; /*. xml" }). Mockito. Component. public class OneTest { private One one; @Test public void testAddNode () { Map<String, String> nodes = Mockito. thenReturn (false) // your test logic } This relies on the difference between @MockBean and @Autowired. Mockito’s @Mock Annotation: (org. Jun 6, 2014 at 1:13. @ TOC本文简述这三个Spring应用里常用的. method (); c. 6k次。在我们写controller或者Service层的时候，需要注入很多的mapper接口或者另外的service接口，这时候就会写很多的@Autowired注解，代码看起来很乱lombok提供了一个注解：@RequiredArgsConstructor(onConstructor =@_(@Autowired))写在类上可以代替@Autowired注解，需要注意的是在注入时需要. 文章中的所有代码均为 Kotlin 语言，与 Java 略有不同。. In your code , the autowiring happens after the no args constructor is invoked. Spring本身替换的注解（org. rule(); @Mock SampleDependency dependency; @InjectMocks SampleService sampleService; 对应于实现代码中的每个@Autowired字段，测试中可以用一个@Mock声明mock对象，并用@InjectMocks标示需要注入的对象。Java Spring application @autowired returns null pointer exception. I would suggest to use constructor injection instead. And this is works fine. out. @Mock is used to create mocks that are needed to support the testing of the class to be tested. 1 @InjectMocks inject @MockBean by Constructor and setter not working properly. xml"}) public class Test { @Mock private ServiceOne serviceOne; //this mock object and it's return //objects are set properly @Autowired @InjectMocks private ClassA classA; //all fields are autowired, including the services that should. I don't remember having "@Autowired" anotation in Junittest. In case we. When using MockitoJUnitRunner you don't need to initialize mocks and inject your dependencies manually: @RunWith (MockitoJUnitRunner. getArticles ()とspringService1. If you wanted to leverage the @Autowired annotations in the class. Mockito Extension. @InjectMocks：创建一个实例，其余用@Mock（或@Spy）注解创建的mock将被注入到用该实例中。. Use @Mock and @InjectMocks for running tests without a Spring context, this is preferred as it's much faster. @InjectMocks: 创建一个实例，其余用@Mock（或@Spy）注解创建的mock将被注入到用该实例中。注意：必须使. toString (). initMocks(this)初始化这些模拟并注入. 我有一个A类，它使用了3个不同的带有自动装配的类public class A () { @Autowired private B b; @Autowired private C c; @Autowired private D d;}当测试它们时，我想只有2个类(B & C)作为模拟，并有D类被自动连接为正常运行，这段代码对我不起作用：@RunWith(Mocki690. mock() method. First of all, let’s import spring-context dependency in our pom. But if we are using annotation based dependency injection in our classes using spring then our A class will look something like. rule(); @Mock SampleDependency dependency; @InjectMocks SampleService sampleService; 对应于实现代码中的每个@Autowired字段，测试中可以用一个@Mock声明mock对象，并用@InjectMocks标示需要注入的对象。 Java Spring application @autowired returns null pointer exception. 关注. 3 Answers. 但是 Kotlin 的语法比较. public class SpringExtension extends Object implements. This post. class); one = Mockito. 7k次，点赞5次，收藏18次。. It doesn't require the class under test to be a Spring component. Maven. Try changing project/module JDK to 1. An example:To test this code, we can use the same two approaches as before – either create a concrete class or use Mockito to create a mock: Here, the abstractFunc () is stubbed with the return value we prefer for the test. So I recommend the @Autowired for your answer. */ } Mockito will consider all fields having @Mock or @Spy annotation as potential candidates to be injected into the instance annotated with @InjectMocks. My JUnit tests are @RunWith the MockitoJUnitRunner and I build @Mock objects that satisfy all the dependencies for the class being tested, which are all injected when the private member is annotated with @InjectMocks. io mockとは Mockitoでは、インターフェースやクラスを. And in the method you will be able to do like this: @SpyBean lateinit var serviceMock: Service @Test fun smallTest () `when` (serviceMock. @Mock creates a mock. @RunWith(SpringJUnit4ClassRunner. I'm currently studying the Mockito framework and I've created several test cases using Mockito. Esta anotación es previa a la aparición del estándar, por lo que Spring, para cumplir con el mismo, adoptó también la anotación @Inject. getListWithData (inputData). @SpringBootTestアノテーションで@InjectMocksで指定したクラスに対して中で指定している@Autowiredの対象クラスをDIします。 @Autowiredの対象クラスはクラス変数としてPowerMockito. 評価が高い順. getArticles2 ()を最も初歩的な形でモック化してみる。. #1 — Mockito and InjectMocks Just adding an annotation @ InjectMocks in our service will make to our @Mock s are injected into service, what our repository includes. 2. 38. class) 或 Mockito. I'm using Mockito's @Mock and @InjectMocks annotations to inject dependencies into private fields which are annotated with Spring's @Autowired:. @InjectMocks is a Mockito mechanism for injecting declared fields in the test class into matching fields in the class under test. class)或Mockito. In your example you need to autowire the GetCustomerEvent bean. It allows shorthand mock and spy injections and minimizes the repetitive mocks and spy injection. Things get a bit different for Mockito mocks vs spies. _junit+mockito单元测试用例. initMocks (this). Then you should be able to @Autowired the actual repository: These execution paths are valid for both setter and field injection. After debugging I found a reason. @Autowird 等方式完成自动注入。. Use @InjectMocks to create class instances that need to be tested in the test class. . mock; import static org. 今天写单元测试用例，跑起来后，出现了空指针异常。. @Service class ServiceA { fun getMessage(): String = "Hi" } @Service class ServiceC { @Autowired private lateinit var a: ServiceA fun getGreet. NullPointerException，mock的dao没有注入成功，不. getData ()). @RunWith (SpringRunner. Ofcourse it will throw a NullPointerExcedption you never assign the ccPOService field anything, so it will remain null. core. class); // a mock for base service, mockito can create this: @mock baseservice baseservice; // create the child class ourselves with the mock, and // the combination of @injectmocks and @spy tells mockito to //. But it seems like you are doing integrations tests, so the below code should work - I have not tested it. Into the configuration you will be able to mock your beans and also you must define all types of beans which you are using in test/s flow. MockitoJunitRunner を使用していないため あなたは mocks を初期化する. . 结果调用controller执行refreshCache函数时报空指针异常，通过debug模式跟踪发现以下地方cacheJob对象是null。. mock ()メソッドを使って. . @Mockと@InjectMocksについて モック化するクラスは@Mockで設定し、テスト対象のクラスに@InhectMocksを使ってインジェクションする。 ※モック化したクラスがテスト対象クラスでインスタンスされてメソッドが呼ばれていた場合、whenなどの設定は無効になるため気. findMe (someObject. out. However, since you are writing a unit test for the service, you don't need the Spring extension at all. 1. Here if you see @Autowired @InjectMocks are used together and what it will do is inject the mocked class (which is SomeRepository in our case) and Autowired. class) @AutoConfigureMockMvc (secure=false) public class ProductControllerTest { @Autowired private MockMvc mockMvc; @Autowired private. 评论. 在某些情况下，这种方法行不通：当 A 用 @Transactional 注释 (或方法用 @Transactional. The second option is to use @Mock instead of @MockBean , and call @InjectMocks in conjunction with the MockitoExtension for constructing the. Mocking autowired dependencies with Mockito. 8. name") public class FactoryConfig { public FactoryConfig () { } @Bean public Test test. initMocks(this)进行mocks的初始化和注入。トップ Mockito に関する質問. Code Snippet 2: MockMvc through Autowiring. How to resolve this. When I looked under the hood I determined that the ‘@Autowired’ and ‘@Inject’ annotation behave identically. 另外，我认为你需要使用 SpringJUnit4ClassRunner 为了 Autowiring, 工作S. e. I have a FactoryConfig class with all beans and annotation @Configuration and @ComponentScan written as below. @InjectMocks を付けたオブジェクトのフィールドを Mockにする場合に、そのMockは @Mockで作成する。 イメージ的には、@InjectMocks と @Mock は一緒に宣言して使う。 @Mockで作成するMockオブジェクトは、利用前に初期化し、利用後は後処理（close）を行う。 @Autowired: spring propriety annotation (as opposed to @Inject and @Resource) that inject a resource by-type, i. 1. There is a scenario to watch out for where we have class with a few instance variables of reference types but not all of them get initialized via a constructor. Share. So remove mocking. Project Structure -> Project Settings->Project SDK and Project Language Level. 注意：必须使用 @RunWith (MockitoJUnitRunner. class) public class PersonServiceTest. mock(): The Mockito. how to. @Mock is used to create mocks that are needed to support the testing of the class to be tested. 0~ 一、背景. 3 Mockito has @InjectMocks - this is incredibly useful. initMocks. 我的程序结构大致为：. context. mock (Map. java - @InjectMocks @Autowired together issue - could help me please, code: @contextconfiguration(locations = { "/applicationcontext. 2. Commenting by memory, should it be "@InjectMocks" that should go in DeMorgenArticleScraperTest instead of "@Autowired". Also, spring container does not manage the objects you create using new operator. This is because of the org. That is why you can autowire this bean without explicitly creating it. ・モック化したいフィールドに @Mock をつける。. @InjectMocks: 创建一个实例，其余用@Mock（或@Spy）注解创建的mock将被注入到用该实例中。. 3、@Autowired、@Inject是默认按照类型匹配的，@Resource是按照名称匹配的. One option is create mocks for all intermediate return values and stub them before use. SpringExtension. mockitoのアノテーションである @Mock を使ったテストコードの例. 使用Mock打桩的为MyRepository，原本以为使用InjectMocks后，MyService会自动. 6k次，点赞2次，收藏9次。在使用powermock时，要测试的类里有@Autowired方式注入的dao类，同时我还要mock这个类里的私有方法，所以使用了powermock的@PrepareForTest注解，但是在加上@PrepareForTest注解后，原本mock的dao类，在test时，报了java. 如果存在一个带参的构造方法，那么 setter 方法 和 属性 注入都不会发生。. Spring funciona como una mega factoria de objetos. It doesn't require the class under test to be a Spring component. But if we are using annotation based dependency injection in our classes using spring then our A class will look something like. what is mockito? how to create a simple spring boot project with unit testing. 5. getBean () method. From Mockito documentation: Property setter injection; mocks will first be resolved by type, then, if there is several property of the same type, by the match of the property name and the mock name. MockitoAnnotations. springBoot @Autowired注入对象为空原因总结. In your example you need to autowire the GetCustomerEvent bean. the productcontroller property annotated with @injectmocks will be initialized by mockito and even correctly wired to the mockproductservice in the test class. So yes it fails silently, because Mockito is not able to confirm an object is correctly initialized or not when this object relies on fields/setters, it’s just impossible. import org. Minimizes repetitive mock and spy injection. @InjectMocks是一个机构的Mockito被测在测试类注入声明的字段到字段匹配类中的。 它不要求被测类是 Spring 组件。 @Autowired是 Spring 的注释，用于将 bean 自动装配到生产、非测试类中。. Another solution is to use @ContextConfiguration annotation with static inner configuration class like so: import static org. I tried to do @Autowired step to since I was running into the exception of NullPointer, but it's running into exception even after that. Mockito. I'm using Mockito's @Mock and @InjectMocks annotations to inject dependencies into private fields which are annotated with Spring's @Autowired: @RunWith (MockitoJUnitRunner. This will make sure that the repository bean is mocked before the service bean is autowired. JSR 330's @Inject annotation can be used in place of Spring's @Autowired in the examples below. . So how will I get the value of this. Maybe you did it accidentally. @Mock を使うことで外部に依存しない、テストしたいクラスだけに注力することができる. xml file. @Autowired ComplicatedDependency complicatedDependency; @Override public void methodUsingDependency(){String string = complicatedDependency. @Component public class ClassA { public final String str = "String"; public ClassA () { System. Spring Mockito @injectmocks ne fonctionne pas - java, printemps,. springframework. 提供了一种对真实对象操作的方法. 例えば3つくらい@Autowiredしていて、1つだけ単体テスト用に動作を変えるようなこともできます。 この場合は、@SpringBootTestにして、動作は変えないクラスをテストクラスの中で@Autowiredします。 この場合はSpringBootに依存しちゃいますけ. サンプルコードには、 @InjectMocksオブジェクトを宣言する. @InjectMocks - это механизм Mockito для ввода объявленных полей в класс test в соответствующие поля в классе при тестировании. 概要. 被测试的DictTypeServiceImpl中代码文章浏览阅读7. xml" }) @runwith(springjunit4classrunner. public class. g. I can acheive my goal by using the field injection with @autowired. There is a scenario to watch out for where we have class with a few instance variables of reference types but not all of them get initialized via a constructor. 4、@Autowired如果需要按照. (@Autowired). 2 @Mock：创建Mock对象. RestTemplate on the other hand is a bean you have to create by yourself - Spring will. We can use @Mock to create and inject mocked instances without having to call Mockito. @Mock: 创建一个Mock. lang. I see that when the someDao. 5 @Autowire combined with @InjectMocks. And use the mock for the method to get your mocked response as the way you did for UserInfoService. Here if you see @Autowired @InjectMocks are used together and what it will do is inject the mocked class (which is SomeRepository in our case) and Autowired annotation adds any other dependency. After debugging, we found that the root cause is the @Autowire not working, and we found that the UnitTest is a common junit test case, and is not a springboot testcase, so there is no spring container for it. Like this, you first assign a Mock and then replace this instance with another mock. beans. SpringのAutowiredで困っているのでご教示ください。 HogeClassはmainメソッドでnewを利用してインスタンス生成されます。この仕組みは変更できません。 HogeClassではAutowiredを利用してサービスなどをDIしたいのですが、可能なのでしょう. The @Mock annotation is used to create and inject mocked instances. Injection allows you to, Enable shorthand mock and spy injections. Looks to me like ParametersJCSCache is not a Spring managed bean. Commenting by memory, should it be "@InjectMocks" that should go in DeMorgenArticleScraperTest instead of "@Autowired". @InjectMocks - Instantiates testing object instance and tries to inject fields annotated with @Mock or @Spy into private fields of testing. When starting the Spring. NullPointerException，mock的dao没有注入成功，不明白是否是powermock的. @Service public class A { @Inject private B b; @Inject private C c; void method () { System. Unfortunately I can't mocked ServiceDao,. To solve it try to use the @Spy annotation in the field declaration with initializing of them and. It uses field level annotations: @InjectMocks - Instantiates testing object instance and tries to inject fields annotated with @Mock or @Spy into private fields of. Spring Bootのアプリケーションなどをテストする時に便利なモックオブジェクトですが、他の人が書いたコードを見ていると、@Mockや@MockBean、Mockito. 私はMockito @Mockと@InjectMocksアノテーションを使用して、Springでアノテーションが付けられたプライベートフィールドに依存関係を挿入しています@Autowired。 @RunWith (MockitoJUnitRunner. To use the @RequiredArgsConstructor, the variable has to be final and it will create the values in constructor automatically. If you want D to be Autowired dont need to do anything in your Test class. Another solution is to use @ContextConfiguration annotation with static inner configuration class like so: import static org. Mocking autowired dependencies with Mockito. 上一篇文章（springboot使用Mockito和Junit进行测试代码编写）对springboot1. 1. 注意：必须使用@RunWith (MockitoJUnitRunner. I tried to do @Autowired step to since I was running into the exception of NullPointer, but it's running into exception even after that. From the link: With the exception of test 2 & 7 the configuration and outcomes were identical. @InjectMocks，将. 因此对于被测试对象的创建，Mock 属性的注入应该让 @Mock 和 @InjectMocks这两个注解大显身手了。. Of course this one's @Autowired field is null because Spring has no chance to inject it. Add a comment. getCustomers (); 5 Answers. Это не требует, чтобы тестируемый класс являлся компонентом Spring. ※ @MockBean または @SpyBean. 于是查了下，发现Mock对象的一个属性未注入，为null。. @Autowired es la anotación propia de Spring para la inyección de dependencias. by the class of by the interface of the annotated field or contractor. class) 或 . First of all, let’s import spring-context dependency in our pom. Difference between @Mock and @InjectMocks. "spring @autowired fields - which access modifier, private or package-private?". mock(otherservice. 这里推荐使用mockito 的InjectMocks注解。测试可以写成 @Rule public MockitoRule rule = MockitoJUnit. 其中，@InjectMocks和@Spy创建的是一个实例对象，@Mock则创建的是一个虚拟对象，@Mock可以单独使用或者和@InjectMocks共同使用，@Mock的对象会被注入到@InjectMocks中。使用Mock时我们主要会用到@InjectMocks、@Mock和@Spy这三个注解，方法则主要是doReturn-when和when-thenReturn两种方式。实现动态高度下的不同样式展现. 9. mock为一个interface提供一个虚拟的实现，. We can use @Mock to create and inject mocked instances without having to call Mockito. @Mock：创建一个Mock。. 一、@ Autowired 1、@ Autowired 是 spring 自带的注解，通过后置处理器‘ Autowired AnnotationBeanPostProcessor’ 类实现的依赖注入； 2、@ Autowired 是根据类型进行自动装配的，如果需要按名称进行装配，则需要配合@Qualifier，同时可结合@Primary注解； 3、@ Autowired 可以作用在. @Autowired、@Inject、@Resourceについて、共通的な動きとしては、何れも自動でフィールドにbeanをインジェクションすることです。今回はそれらの違いについて、検証してみます。 @Resource⇨javax. springframework. Instead make POService porderService a field and annotate with @InjectMocks so it will automatically create an instance and assign the mocked objects to its field and constructor (or just injec both. 你有没有思考过Spring中的@Autowired注解？通常用于方便依赖注入，而隐藏在这个过程之后的机制到底是怎样，将在本篇中进行讲述。 @Autowired所具有的功能@Autowired是一个用来执行依赖注入的注解。每当一个Spring…4. 文章浏览阅读1. This will make sure that the repository bean is mocked before the service bean is autowired. out. Inyectar objetos simulados utilizando FactoryBean: java, spring, unit-testing, autowired, easymock. In case we. Also you can simplify your test code a lot if you use @InjectMocks annotation. mock; import static org. thenReturn ("my response"); Use Mockito to mock autowired fields. EnvironmentAware; Spring then passes environment to setEnvironment () method. annotation @Inject⇨javax. how to write unit tests with mockito using @mock and @injectmocks without launching up a spring context. Main Difference If we are talking about the main difference then in simple terms we can say @Mock creates a mock, and @InjectMocks creates an instance of the. Following is the code that passes ONLY AFTER explicitly disabling security. P. Use @SpringBootTest or @SpringMvcTest to start a spring context together with @MockBean to create mock objects and @Autowired to get an instance of class you want to test, the mockbeans will be used for its autowired dependencies. In your code , the autowiring happens after the no args constructor is invoked. Here B and C could have been test-doubles or actual classes as per need. 以下のテストコードでは、ControllerとServiceの処理を確認するために、Rep. perform() calls. mock() method allows us to create a mock object of a class or an interface. Following is the code that passes ONLY AFTER explicitly disabling security. From Mockito documentation: Property setter injection; mocks will first be resolved by type, then, if there is several property of the same type, by the match of the property name and the mock name. @Autowired tampoco está trabajando para un repositorio que estoy tratando de agregar, pero es básicamente lo mismo que esto, pero es un repositorio. spring autowired mockito单元测试. Add a comment. 看到我头都大了。 我的目标就是把 @MockBean标注的类注入到@InjectMocks里面。但是一直不行。 最终我把@InjectMocks改成了@autowired 发现可以注入了文章浏览阅读9k次，点赞3次，收藏20次。参考文章@Mock与@InjectMocks的区别,mock对象注入另一个mockMock InjectMocks ( @Mock 和 @InjectMocks )区别@Mock: 创建一个Mock. source. getJdbcOperations()). fasterxml. Meaning: if injecting works correctly (and there isn't a problem that isn't reported by Mockito) then your example that uses that annotation should also work when you remove that one line. source. Most likely, you mistyped returning function. The word inject might be misleading if you think of Spring's dependency injection when you read @InjectMocks. 文章浏览阅读2. テスト対象のクラスのオブジェクトに「@InjectMocks」を付与し、テスト対象クラス内で呼ばれるクラスのオブジェクトに「@Mock」を付与することで、Mock化が行える。 「when(実行メソッ. But it's not suitable for unit test so I'd like to try using the constructor injection. Code Answer. . class) public class DemoTest { @Mock private SomeService service; @InjectMocks private Demo demo; /*. Instead make POService porderService a field and annotate with @InjectMocks so it will automatically create an instance and assign the mocked objects to its field and constructor (or just injec both through the. IMHO using the MockitoRule is the best one, because it lets you still choose another runner like e. However, since you are writing a unit test for the service, you don't need the Spring extension at all. 在单元测试中，没有. Mockito: Inject real objects into private @Autowired fields. When using MockitoJUnitRunner you don't need to initialize mocks and inject your dependencies manually: @RunWith (MockitoJUnitRunner. January 21, 2014 Testing IoC, Mockito, Spring, TestNG. However when I test with JUnit I get a null pointer when I try to use the @Autowired objects. 1 Answer Sorted by: 13 Usually when you are unit testing, you shouldn't initialize Spring context. ・テスト対象のインスタンスに @InjectMocks を. 13. While testing them, i would like to have only 2 of the classes (B & C) as mocks and have class D to be Autowired as normal running, this code is not working for me: @RunWith(MockitoJUnitRunner. それではspringService1. Normalmente estamos acostumbrados a usar @AutoWired a nivel de la propiedad que deseamos inyectar. 我在本地使用@InjectMocks注入依赖时发现@InjectMocks并不能将“被注入类”中所有“被Mook的类”都用“Mook的类”的替换掉，注入的方式似乎没有规则，目前测试结果如下：. println ("Class A initiated"); } }ObjectMapper bean is created by Spring Boot because you have ObjectMapper class present in your classpath and that triggers JacksonAutoConfiguration. The only downside I can see is that you're not testing the injection, but then with @InjectMocks, I think you'd be testing it with Mockito's injection implementation, rather than your real framework's implementation anyway, so no real difference. @Spy，被标注的属性是个spy，需要赋予一个instance。. I recommend the annotation as it adds some context to the mock such as the field's name. The @Mock. You probably wanted to return the value for the mocked object. powermock. mockito.