public void PatchReservation_WithExistingReservationAndId_ShouldReturnOkObjectResult()
{
// Act
var result = sut.PatchReservation(patchedReservation, existingReservationId);
// Assert
Assert.IsInstanceOfType(result, typeof(OkObjectResult));
mockReservationRepository.Verify(r => r.Retrieve(existingReservationId), Times.Once);
mockReservationService.Verify(r => r.Save(existingReservationId, reservation), Times.Once);
}