Simple Mockito Unit Test failed - spring-boot

Question

I'm trying to produce a first test with Mockito in a Spring Boot Application.
Here is the complete class:
import org.junit.jupiter.api.Assertions;
import org.junit.jupiter.api.DisplayName;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;
import org.mockito.Mock;
import org.mockito.junit.jupiter.MockitoExtension;
import java.util.Optional;
import static org.mockito.Mockito.doReturn;
#ExtendWith(MockitoExtension.class)
public class ObjectServiceTest {
#Mock
private ObjectRepository objectRepository;
#Mock
private ObjectService objectService;
#Test
#DisplayName("Should find object by objNumero with its service")
void shouldFindObjectByObjNumero() {
Object object = new Object("00000271");
doReturn(Optional.of(object)).when(objectRepository).findObjectByObjNumero("00000271");
Optional<Object> returnedObject = objectService.findObjectByObjNumero("00000271");
Assertions.assertTrue(returnedObject.isPresent(), "Object was found");
Assertions.assertSame(returnedObject.get(), object, "The returned object wasn't the same as the mock");
}
}
And here is the error message:
org.opentest4j.AssertionFailedError: Object was not found ==>
Expected :true Actual :false
As you can see, the test is supposed to pass because I've created a new object and I use the same reference each time!

Answer 1

So, I've the solution. I've made 2 mistakes with the service:
#Mock
private ObjectService objectService;
Here I need the ObjectServiceImpl and not the interface. Than, I've use #InjectMocks instead of #Mock. For the moment, I already don't know what is the difference but it works!
#InjectMocks
private ObjectServiceImpl objectServiceImpl;