Injecting Mockito mocks into a Spring bean
I would like to inject a Mockito mock object into a Spring (3+) bean for the purposes of unit testing with JUnit. My bean dependencies are currently injected by using the @Autowired annotation on private member fields.
I have considered using ReflectionTestUtils.setField but the bean instance that I wish to inject is actually a proxy and hence does not declare the private member fields of the target class. I do not wish to create a public setter to the dependency as I will then be modifying my interface purely for the purposes of testing.
I have followed some advice given by the Spring community but the mock does not get created and the auto-wiring fails:
<bean id="dao" class="org.mockito.Mockito" factory-method="mock">
<constructor-arg value="com.package.Dao" />
</bean>
The error I currently encounter is as follows:
...
Caused by: org...NoSuchBeanDefinitionException:
No matching bean of type [com.package.Dao] found for dependency:
expected at least 1 bean which qualifies as autowire candidate for this dependency.
Dependency annotations: {
@org...Autowired(required=true),
@org...Qualifier(value=dao)
}
at org...DefaultListableBeanFactory.raiseNoSuchBeanDefinitionException(D...y.java:901)
at org...DefaultListableBeanFactory.doResolveDependency(D...y.java:770)
If I set the constructor-arg value to something invalid no error occurs when starting the application context.
The best way is:
<bean id="dao" class="org.mockito.Mockito" factory-method="mock">
<constructor-arg value="com.package.Dao" />
</bean>
Update
In the context file this mock must be listed before any autowired field depending on it is declared.
@InjectMocks
private MyTestObject testObject;
@Mock
private MyDependentObject mockedObject;
@Before
public void setup() {
MockitoAnnotations.initMocks(this);
}
This will inject any mocked objects into the test class. In this case it will inject mockedObject into the testObject. This was mentioned above but here is the code.
我有一个使用Spring Java Config和Mockito的非常简单的解决方案：
@Configuration
public class TestConfig {
@Mock BeanA beanA;
@Mock BeanB beanB;
public TestConfig() {
MockitoAnnotations.initMocks(this); //This is a key
}
//You basically generate getters and add @Bean annotation everywhere
@Bean
public BeanA getBeanA() {
return beanA;
}
@Bean
public BeanB getBeanB() {
return beanB;
}
}
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