public void WhenHealthVaultBloodGlucoseTransformedToFhir_ThenCodeAndValuesEqual()
        {
            var when         = new HealthServiceDateTime();
            var bloodGlucose = new BloodGlucose
            {
                When  = when,
                Value = new BloodGlucoseMeasurement(101),
                GlucoseMeasurementType      = new CodableValue("Whole blood", "wb", "glucose-meaurement-type", "wc", "1"),
                OutsideOperatingTemperature = true,
                IsControlTest      = false,
                ReadingNormalcy    = Normalcy.Normal,
                MeasurementContext = new CodableValue("Before meal", "BeforeMeal", "glucose-measurement-context", "wc", "1"),
            };

            var observation = bloodGlucose.ToFhir();

            var json = FhirSerializer.SerializeToJson(observation);

            Assert.IsNotNull(observation);
            Assert.AreEqual(101, ((Quantity)observation.Value).Value);
            Assert.AreEqual("Whole blood", observation.Method.Text);

            var bloodGlucoseExtension = observation.GetExtension(HealthVaultExtensions.BloodGlucose);

            Assert.AreEqual("Before meal", bloodGlucoseExtension.GetExtensionValue <CodeableConcept>(HealthVaultExtensions.BloodGlucoseMeasurementContext).Text);
            Assert.AreEqual(true, bloodGlucoseExtension.GetBoolExtension(HealthVaultExtensions.OutsideOperatingTemperatureExtensionName));
            Assert.AreEqual(false, bloodGlucoseExtension.GetBoolExtension(HealthVaultExtensions.IsControlTestExtensionName));
            Assert.AreEqual("Normal", bloodGlucoseExtension.GetStringExtension(HealthVaultExtensions.ReadingNormalcyExtensionName));
        }