测试类中的静态内部类识别不到（NoSuchBeanDefinitionException）解决

问题

测试类里面的静态内部类识别不到

@RunWith(SpringRunner.class)
@SpringBootTest
public class FooTest {
    @Autowired
    private Bar bar;
    @Test
    public void bar() {
        
    }

    @Component
    public static class Bar {
    }

}

当执行bar测试方法的时候 报错：

Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.my.app.dao.FooTest$Bar' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoMatchingBeanFound(DefaultListableBeanFactory.java:1654) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]
    
    

解决
经过断点调试发现

org.springframework.beans.factory.support.DefaultListableBeanFactory#doGetBeanNamesForType

this.beanDefinitionNames并没有fooTest.Bar

添加两个额外的注解后

@RunWith(SpringRunner.class)
@SpringBootTest
@ComponentScan
@ImportAutoConfiguration
public class FooTest 

会去调用如下方法 注入fooTest.Bar到beanDefinitionNames中

org.springframework.beans.factory.support.DefaultListableBeanFactory#registerBeanDefinition

对应的调用栈信息