@RunWith(SpringRunner.class)
@SpringBootTest
@AutoConfigureMockMvc
class UserServiceTest {

    @Mock
    private UserService userService;

    private User user = new User();

    @BeforeEach
    void setUp(){
        user.setUsername("user");
        user.setPassword("user123");
    }

    @Test
    void shouldReturnUser(){
        when(userService.findByUsername(anyString())).thenReturn(user);
        User u = userService.findByUsername("user");
        assertEquals(u,user);
        assertEquals("user",u.getUsername());
    }

    @Test
    void shouldSaveUser(){
        doAnswer( i ->{
            User u1 = i.getArgument(0);
            assertNotNull(u1.getUsername());
            assertNotNull(u1.getPassword());
            assertEquals("user",u1.getUsername());
            assertEquals("user123",u1.getPassword());
            return null;
        }).when(userService).save(any(User.class));

        userService.save(user);
    }

    @Test
    void shouldReturnTrue(){
        when(userService.existsByUsername(user.getUsername())).thenReturn(true);

        assertTrue(userService.existsByUsername("user"));
    }

}