private Message Init(string input)
        {
            var message = new Message(input);
            Assert.That( message.ParseMessage(), Is.True );
            Assert.That( message.SegmentCount, Is.GreaterThan(0) );

            return message;
        }
        
        [Test]
        public void DOES_NOT_WORK_BUT_I_WOULD_HAVE_EXPECTED_IT_TO()
        {
            var msg = Init(
 @"MSH|^~\&|SomeSystem|Wubba|Mustersystem||200001211610||BAR^P01|MSG161271|P|2.2
EVN|P01|200001211614
PID|1||1000040|1000040|Musterfrau^Eva^^^||196106280000|M|||Some Street 12^^Somewhere^^12345^D||0651/8247105|||||||||||||D|
PV1|1|O|^^^CACH^CAFR^|01^Normalfall^301||||^^^^^|^^^^^|N||||||N|||0119171||K||||||||||| ||||||||||||200106200800||||||
DG1|110|I9|602.9||200001211610|AD|||||||||N
PR1|5000|OPS-20|5-822.7||200001211800||10|||||||H
ZOP||5093|200001212100|60|||||
DG1|200|I9|602.9||200001212130|PO|||||||||H
PR1|6000|OPS-20|5-822.7||200001212130||10|||||||H
ZOP||5094|200001222100|60|||||
DG1|201|I9|602.9||200001212130|PO|||||||||H
DG1|202|I9|602.9||200001212145|PO|||||||||N
PR1|6001|OPS-20|5||200001212130||10|||||||H||200001222130|PO|||||||||N
PR1|6001|OPS-20|5-822.7||200001222130||10|||||||H");

            Assert.That(msg.SegmentCount, Is.EqualTo(14));

            var dg1Segs = msg.Segments("DG1");
            var third = dg1Segs[2].GetAllFields();
            var fourth = dg1Segs[3].GetAllFields();

            Assert.That(third.Count, Is.EqualTo(15));
            Assert.That(fourth.Count, Is.EqualTo(15));

            for (int i = 0; i < 15; i++)
            {
                switch (i)
                {
                    case 1:
                        Assert.That(third[i].Value, Is.EqualTo("201"), string.Format("Invalid DG1 field at position {0} in third detected Segment", i));
                        Assert.That(fourth[i].Value, Is.EqualTo("202"), string.Format("Invalid DG1 field at position {0} in fourth detected Segment", i));
                        break;
                    case 5:
                        Assert.That(third[i].Value, Is.EqualTo("200001212130"), string.Format("Invalid DG1 field at position {0} in third detected Segment", i));
                        Assert.That(fourth[i].Value, Is.EqualTo("200001212145"), string.Format("Invalid DG1 field at position {0} in fourth detected Segment", i));
                        break;
                    case 14:
                        Assert.That(third[i].Value, Is.EqualTo("H"), string.Format("Invalid DG1 field at position {0} in third detected Segment", i));
                        Assert.That(fourth[i].Value, Is.EqualTo("N"), string.Format("Invalid DG1 field at position {0} in fourth detected Segment", i));
                        break;
                    default:
                        Assert.That(third[i].Value, Is.EqualTo(fourth[i].Value), string.Format("DG1-fields differed at position {0}", i));
                        break;
                }
            }
        }
        
        [Test]
        public void DOES_WORK_SINCE_THE_ORDERING_CONDITION_WAS_REMOVED()
        {
            var msg = Init(
 @"MSH|^~\&|SomeSystem|Wubba|Mustersystem||200001211610||BAR^P01|MSG161271|P|2.2
EVN|P01|200001211614
PID|1||1000040|1000040|Musterfrau^Eva^^^||196106280000|M|||Some Street 12^^Somewhere^^12345^D||0651/8247105|||||||||||||D|
PV1|1|O|^^^CACH^CAFR^|01^Normalfall^301||||^^^^^|^^^^^|N||||||N|||0119171||K||||||||||| ||||||||||||200106200800||||||
DG1|110|I9|602.9||200001211610|AD|||||||||N
PR1|5000|OPS-20|5-822.7||200001211800||10|||||||H
ZOP||5093|200001212100|60|||||
DG1|200|I9|602.9||200001212130|PO|||||||||H
PR1|6000|OPS-20|5-822.7||200001212130||10|||||||H
ZOP||5094|200001222100|60|||||
DG1|201|I9|602.9||200001212130|PO|||||||||H
DG1|202|I9|602.9||200001212145|PO|||||||||N
PR1|6001|OPS-20|5||200001212130||10|||||||H||200001222130|PO|||||||||N
PR1|6001|OPS-20|5-822.7||200001222130||10|||||||H");

            Assert.That(msg.SegmentCount, Is.EqualTo(14));

            var dg1Segs = msg.Segments("DG1");
            var third = dg1Segs[2].GetAllFields();
            var fourth = dg1Segs[3].GetAllFields();

            Assert.That(third.Count, Is.EqualTo(15));
            Assert.That(fourth.Count, Is.EqualTo(15));

            // Note: Apparently, 'GetAllFields()' provides *ABSOLUTELY NO GUARANTEE ON THE ORDERING* of the elements
            //       Internally, it is implemented as a List in that library but its not filled in order of input.
            // The the ordering is at least identical between these two segments, otherwise the code would not be
            // working deterministically. Therefore, this assumption has been encoded into this test, aka the for-loop.
            for (int i = 0; i < 15; i++)
            {
                if ( third[i].Value.Equals("200001212130") )
                {
                  Assert.That(fourth[i].Value, Is.EqualTo("200001212145"), string.Format("Invalid DG1 field in fourth detected Segment (FieldList-Position {0})!", i));
                }
                else if ( third[i].Value.Equals("201") )
                {
                  Assert.That(fourth[i].Value, Is.EqualTo("202"), string.Format("Invalid DG1 field in fourth detected Segment (FieldList-Position {0})!", i));
                }
                else if ( third[i].Value.Equals("H") )
                {
                  Assert.That(fourth[i].Value, Is.EqualTo("N"), string.Format("Invalid DG1 field in fourth detected Segment (FieldList-Position {0})!", i));
                }
                else Assert.That(third[i].Value, Is.EqualTo(fourth[i].Value), string.Format("DG1-fields differed at position {0}", i));
            }
        }