The library currently has duplicate tests using NUnit (complete) and Xunit (incomplete). This requires writing two tests for every change. The library should pick one framework and stick to it. If Xunit is the one to use, it needs to be completed; otherwise, it should be removed.
Description
The library currently has duplicate tests using NUnit (complete) and Xunit (incomplete). This requires writing two tests for every change. The library should pick one framework and stick to it. If Xunit is the one to use, it needs to be completed; otherwise, it should be removed.