Convert to Xunit

[adamhathcock]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 99.64602% with 4 lines in your changes missing coverage. Please review.

Project coverage is 68.85%. Comparing base (465f635) to head (7044540).
Report is 1 commits behind head on dev.

Files with missing lines	Patch %	Lines
....Sdk.Tests.Unit/Api/Operations/SendReceiveLocal.cs	96.77%	0 Missing and 1 partial ⚠️
....Tests.Unit/Models/Extensions/DisplayValueTests.cs	90.90%	0 Missing and 1 partial ⚠️
...le.Sdk.Tests.Unit/Transports/DiskTransportTests.cs	88.88%	0 Missing and 1 partial ⚠️
...Sdk.Tests.Unit/Transports/SQLiteTransport2Tests.cs	92.30%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##              dev     #196       +/-   ##
===========================================
+ Coverage   56.74%   68.85%   +12.10%     
===========================================
  Files         247      265       +18     
  Lines       10011    10784      +773     
  Branches     1093     1091        -2     
===========================================
+ Hits         5681     7425     +1744     
+ Misses       4067     3011     -1056     
- Partials      263      348       +85     

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