Pruebas Unitarias

Ejemplo de prueba:

@Test
void testGetAllCupones() {
    when(cuponRepository.findAll()).thenReturn(Arrays.asList(cupon));
    assertEquals(1, cuponService.getAllCupones().size());
}

@Test
void testGetCuponById_found() {
    when(cuponRepository.findById(1L)).thenReturn(Optional.of(cupon));
    Optional<Cupon> resultado = cuponService.getCuponById(1L);
    assertTrue(resultado.isPresent());
    assertEquals("DESC10", resultado.get().getCodigo());
}

@Test
void testGetCuponById_notFound() {
    when(cuponRepository.findById(99L)).thenReturn(Optional.empty());
    assertTrue(cuponService.getCuponById(99L).isEmpty());
}