如何为具有自动装配依赖项的类创建模拟 spring bean

Question

Suppose I have a class called MainClass.

public class MainClass {
    @Autowired
    AutoWiredClass autoWiredClass;
}

I am trying to create a mock bean of MainClass using Mockito.

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration
public class AutowiringTest {
    @Configuration
    static class AutowiringTestConfiguration{

        @Bean
        public MainClass mainClass() {
            return Mockito.mock(MainClass.class);
        }
    }

    @Autowired
    MainClass mainClass;

    @Test
    public void testBeanCreation(){
        assertNotNull(mainClass);
    }
}

I am getting this error while running the test case.

Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: autowiring.AutoWiredClass autowiring.MainClass.autoWiredClass; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [autowiring.AutoWiredClass] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}

I know I can achieve this using @Mock and @InjectMocks. But that's not the solution I want.

My requirement is to create a mock bean of MainClass without creating an actual bean of AutowiredClass. Please help me how to achieve this.

Answer 1

As Florian has already commented, you should try to create tests that do not need Spring at all, and you will not have those problems.

But, if there is no workaround possible, you can use a bit of magic with the AutoMockRegistryPostProcessor .

You just need to add the AutoMockRegistryPostProcessor to the @ContextConfiguration , and it will create mocks for your missing dependencies:

@ContextConfiguration(classes = { AutowiringTest.class, AutoMockRegistryPostProcessor.class })
public class AutowiringTest {
    // no complains anymore, a mockito mock will be created for AutoWiredClass

The AutoMockRegistryPostProcessor class is not in maven, you will need to copy it in your project.

The docu is here .