Slightly improve test coverage

[ajilo297]

[codecov[bot]]

Codecov Report

Merging #131 (95a7595) into master (98ba530) will increase coverage by 0.51%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #131      +/-   ##
==========================================
+ Coverage   90.60%   91.11%   +0.51%     
==========================================
  Files           9        9              
  Lines         777      777              
==========================================
+ Hits          704      708       +4     
+ Misses         73       69       -4     

Impacted Files	Coverage Δ
lib/src/upgrade_base.dart	73.91% <0.00%> (+8.69%)	:arrow_up:

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[larryaasen]

@ajilo297 Can you explain why these changes are needed and more specifically what they do?