returning values from mockito mocks

Author: bozo1209

src/test/java/guru/springframework/sfgpetclinic/services/springdatajpa/SpecialitySDJpaServiceTest.java

@@ -8,6 +8,9 @@
 import org.mockito.Mock;
 import org.mockito.junit.jupiter.MockitoExtension;
 
+import java.util.Optional;
+
+import static org.assertj.core.api.Assertions.assertThat;
 import static org.junit.jupiter.api.Assertions.*;
 import static org.mockito.Mockito.*;
 
@@ -20,6 +23,22 @@ class SpecialitySDJpaServiceTest {
     @InjectMocks
     SpecialitySDJpaService service;
 
+    @Test
+    void findByIdTest(){
+        Speciality speciality = new Speciality();
+
+        when(specialtyRepository.findById(1L)).thenReturn(Optional.of(speciality));
+
+        Speciality foundSpeciality = service.findById(1L);
+
+        assertThat(foundSpeciality).isNotNull();
+
+        verify(specialtyRepository).findById(1L);
+
+        System.out.println("speciality = " + speciality);
+        System.out.println("foundSpeciality = " + foundSpeciality);
+    }
+
     @Test
     void deleteById() {
         service.deleteById(1L);