@Autowired Spring Boot component is initialized in parent base class but happen to be null in child class

Question

Why the myComponent ends up being null in child junit test class? How to fix it?

Base JUnit test class:

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration
public class BaseTest {
 @Autowired
 MyComponent myComponent;

 @Configuration
 @Import(MyComponentBaseConfiguration.class)
 static class Cfg {
  @Bean
  MyComponent myComponent() {
   return new MyComponent();
  }
 }
void convert(MyComponentInterface component) {
  // here component is null
}
 @Test
 public void test() {
  BaseTestChild child = new BaseTestChild();
  child.test();
 }
}

Child test class:

@RunWith(SpringJUnit4ClassRunner.class)
@FixMethodOrder(MethodSorters.NAME_ASCENDING)
public class BaseTestChild extends BaseTest {
@Test
    public void test() {
        convert(myComponent);  // here myComponent is null
    }
}