There were some unit tests which shared resources. separating these resources solved the final test [#45]
I also noticed at one point, there was a Direct copy of a list:-
MetricPool : SparkplugB.List;
GVL.AllMetricsList : SparkplugB.List;
MetricPool := GVL.AllMetricsList;
This probably caused the headaches in [#47]
Maybe there is a trick to prevent copying lists like that?