test: separate image creation and verification

[kdomanski]

[codecov[bot]]

Codecov Report

Patch coverage has no change and project coverage change: +0.25 :tada:

Comparison is base (4962b64) 78.66% compared to head (7fc5e4e) 78.92%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #41      +/-   ##
==========================================
+ Coverage   78.66%   78.92%   +0.25%     
==========================================
  Files           6        6              
  Lines        1167     1167              
==========================================
+ Hits          918      921       +3     
+ Misses        176      174       -2     
+ Partials       73       72       -1     

see 1 file with indirect coverage changes

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