test: Cleanup test code

[Stranger6667]

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[codecov-commenter]

Codecov Report

Merging #1455 (a107992) into master (837c07e) will increase coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1455      +/-   ##
==========================================
+ Coverage   99.09%   99.12%   +0.03%     
==========================================
  Files          86       86              
  Lines        6659     6659              
  Branches     1163     1163              
==========================================
+ Hits         6599     6601       +2     
+ Misses         31       30       -1     
+ Partials       29       28       -1     

Impacted Files	Coverage Δ
src/schemathesis/cli/callbacks.py	100.00% <0.00%> (+1.63%)	⬆️

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