public async void CreateReservation(
            EStatusCode expectedStatus,
            CreateReservation mutation
            )
        {
            if (expectedStatus != EStatusCode.NotFound)
            {
                EntitiesFactory.NewAnnouncement(id: mutation.AnnouncementId).Save();
            }
            if (expectedStatus == EStatusCode.Conflict)
            {
                EntitiesFactory.NewContact(phone: mutation.ContactPhone).Save();
            }

            var result = await MutationsHandler.Handle(mutation);

            Assert.Equal(expectedStatus, result.Status);
            if (expectedStatus == EStatusCode.Success)
            {
                var reservationDb = await MutationsDbContext.Reservations
                                    .Where(r => r.Id == mutation.Id)
                                    .FirstOrDefaultAsync();

                Assert.NotNull(reservationDb);
                Assert.Equal(mutation.AnnouncementId, reservationDb.AnnouncementId);
                Assert.Equal(mutation.ContactName, reservationDb.Contact.Name);
                Assert.Equal(mutation.ContactPhone, reservationDb.Contact.Phone);
            }
        }