Much better tests for Program

[jaredpar]

Caught a lot of subtle bugs with these changes

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (6fd0357) 78.48% compared to head (c82e5b6) 80.20%.
Report is 1 commits behind head on main.

Files	Patch %	Lines
src/Basic.CompilerLog/Program.cs	94.11%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #86      +/-   ##
==========================================
+ Coverage   78.48%   80.20%   +1.71%     
==========================================
  Files          37       37              
  Lines        3770     3778       +8     
  Branches      363      363              
==========================================
+ Hits         2959     3030      +71     
+ Misses        686      631      -55     
+ Partials      125      117       -8     

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