public class UserServiceImplTest {

    @Mock
    UserRepository userRepository;

    @Mock
    BCryptPasswordEncoder bcryptEncoder;

    @Mock
    RoleService roleService;

    @InjectMocks
    UserServiceImpl userService = new UserServiceImpl();


    User user;
    LoginUser loginUser;
    Role role;
    String password;
    @BeforeEach
    void setUp(){
     MockitoAnnotations.initMocks(this);

    password = bcryptEncoder.encode("password");
    role= new Role(3L,"User Role","ROLE_USER");
    user= new User(1L,"name",password,role);
    loginUser = new LoginUser("name",password);

    }

    @Test
    public void saveUser_Test(){
when(userRepository.save(any(User.class))).thenReturn(user);
  User insertedUser = userService.save(loginUser);
assertNotNull(insertedUser);
assertEquals(user,insertedUser);
    }

}