问Mockito的thenCallRealMethod，不调用公共方法

EN

public class Service {

    @Autowired
    Mapper mapper;

    public void m1(String s){
        System.out.println(s);
        mapper.m1(s);
    }
}

public class Mapper {

    public String m1(String s){
        System.out.println("inside m1 method" +s);
        m2();
        m3();
        return s;
    }

    public void m2(){
        System.out.println("inside m2 public method");
    }

    private void m3(){
        System.out.println("insid m3 private method");
    }
}

@RunWith(MockitoJUnitRunner.class)
public class Testing {

    @Mock
    Mapper mapper;

    @InjectMocks
    Service service;


    @Test
    public void test(){
    when(mapper.m1(Mockito.any(String.class))).thenCallRealMethod();

    service.m1("Check");
    }

    /**
     * @param m1
     */

}