attr: flag test methods

[mmcloughlin]

No description provided.

[codecov-io]

Codecov Report

Merging #177 (21f011b) into master (c5faaae) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #177   +/-   ##
=======================================
  Coverage   79.47%   79.48%           
=======================================
  Files          55       56    +1     
  Lines       30884    30895   +11     
=======================================
+ Hits        24546    24557   +11     
  Misses       6192     6192           
  Partials      146      146           

Flag	Coverage Δ
integration	7.37% <0.00%> (-0.01%)	⬇️
unittests	77.59% <100.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
attr/ztextflag.go	100.00% <100.00%> (ø)

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