public void Given_InValid_Spo2Value_When_validateVitalSign_Invoke_Then_Valid_Result_Asserted()
        {
            //when vital's are in range it will return null else will return alert message.
            ValidatePatientSpo2 spo2 = new ValidatePatientSpo2();
            string Actual            = spo2.ValidateVitalSign("Patient_123", "104");
            string Expected          = "Alert!!! SPO2 not in range SPO2: 104 for patient: Patient_123";

            Assert.AreEqual(Actual, Expected);
        }