More tests

[lmiq]

Add tests to increase coverage.

[codecov]

Codecov Report

Attention: Patch coverage is 80.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 84.33%. Comparing base (d18f148) to head (a2c5b41).
Report is 12 commits behind head on main.

Files with missing lines	Patch %	Lines
src/Atom.jl	75.00%	1 Missing ⚠️
src/getseq.jl	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #29      +/-   ##
==========================================
+ Coverage   77.14%   84.33%   +7.18%     
==========================================
  Files          23       23              
  Lines         954      951       -3     
==========================================
+ Hits          736      802      +66     
+ Misses        218      149      -69     

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