Add some smoke tests

[jwodder]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 91.30435% with 14 lines in your changes missing coverage. Please review.

Project coverage is 52.06%. Comparing base (707bcc1) to head (8ac2d2b).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
src/main.rs	91.30%	14 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #221      +/-   ##
==========================================
+ Coverage   45.56%   52.06%   +6.49%     
==========================================
  Files          29       29              
  Lines        3887     4028     +141     
==========================================
+ Hits         1771     2097     +326     
+ Misses       2116     1931     -185     

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