public async Task When_Notification_Is_Handled_Then_Should_Send_Sms()
            {
                const double currentTemp   = 1.5;
                const double coldSpellTemp = 2.0;
                var          enteredAtUtc  = new DateTime(2015, 1, 1, 12, 0, 0, DateTimeKind.Utc);

                var notification = CreateNotification(currentTemp, coldSpellTemp, enteredAtUtc);

                await Handler.HandleAsync(notification);

                SmsClient.Received().Send(From, To, "12:00: Entered cold spell. (Temp: 1.5C).");
                ColdSpellRepository.Received().SaveAsync(Arg.Is <ColdSpell>(cs => cs.AlertedAt == _utcNow));
            }
            public async Task When_Notification_Is_Handled_Then_Should_Add_Entity_To_Repository()
            {
                const double currentTemp   = 1.5;
                const double coldSpellTemp = 2.0;
                var          enteredAtUtc  = new DateTime(2015, 1, 1, 12, 0, 0, DateTimeKind.Utc);

                var notification = CreateNotification(currentTemp, coldSpellTemp, enteredAtUtc);

                await Handler.HandleAsync(notification);

                ColdSpellRepository.Received().SaveAsync(Arg.Is <ColdSpell>(cs =>
                                                                            cs.AlertedAt == _utcNow &&
                                                                            cs.DeviceId == DeviceId &&
                                                                            cs.SensorId == SensorId));
            }