split files, improve code coverage

[haitch]

No description provided.

[codecov-commenter]

Codecov Report

Merging #16 (bb40d6c) into main (f530737) will increase coverage by 10.13%.
The diff coverage is 79.56%.

@@             Coverage Diff             @@
##             main      #16       +/-   ##
===========================================
+ Coverage   76.23%   86.37%   +10.13%     
===========================================
  Files           7        9        +2     
  Lines         505      543       +38     
===========================================
+ Hits          385      469       +84     
+ Misses         96       61       -35     
+ Partials       24       13       -11     

Impacted Files	Coverage Δ
step_exec_options.go	100.00% <ø> (+25.00%)	⬆️
error.go	44.82% <57.14%> (+14.39%)	⬆️
step_builder.go	82.97% <65.11%> (+16.31%)	⬆️
job_definition.go	89.58% <89.58%> (ø)
job_instance.go	98.66% <100.00%> (ø)
job_result.go	100.00% <100.00%> (+16.66%)	⬆️
retryer.go	100.00% <100.00%> (+15.00%)	⬆️
step_definition.go	100.00% <100.00%> (ø)
step_instance.go	84.21% <100.00%> (ø)
... and 4 more

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