import org.junit.jupiter.api.Test;
import static org.junit.jupiter.api.Assertions.*;

class CalculatorTest {

    @Test
    void additionShouldBeCorrect() {
        Calculator calculator = new Calculator();
        int result = calculator.add(2, 3);
        assertEquals(5, result, "2 + 3은 5여야 합니다.");
    }

    @Test
    void divisionShouldThrowExceptionForZero() {
        Calculator calculator = new Calculator();
        assertThrows(ArithmeticException.class, () -> calculator.divide(5, 0));
    }
}

@SpringBootTest
class MyAppTests {
    @Test
    void contextLoads() {
    }
}

@WebMvcTest(controllers = MyController.class)
class MyControllerTest {
    @Autowired
    private MockMvc mockMvc;

    @Test
    void shouldReturnDefaultMessage() throws Exception {
        mockMvc.perform(get("/api/hello"))
               .andExpect(status().isOk())
               .andExpect(content().string("Hello, World!"));
    }
}

@DataJpaTest
class UserRepositoryTest {
    @Autowired
    private UserRepository userRepository;

    @Test
    void shouldSaveAndFindUser() {
        User user = new User("John Doe", "john@example.com");
        userRepository.save(user);

        Optional<User> result = userRepository.findByEmail("john@example.com");
        assertTrue(result.isPresent());
        assertEquals("John Doe", result.get().getName());
    }
}

@SpringBootTest
class MyServiceTest {
    @MockBean
    private MyRepository myRepository;

    @Autowired
    private MyService myService;

    @Test
    void shouldUseMockedRepository() {
        when(myRepository.findSomething()).thenReturn("Mocked Result");

        String result = myService.getSomething();
        assertEquals("Mocked Result", result);
    }
}