use TestsForCodecPackages.jl

[nhz2]

These testing utilities are being deprecated in TranscodingStreams.jl

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 91.66%. Comparing base (107ccae) to head (ecd83cd).

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #84   +/-   ##
=======================================
  Coverage   91.66%   91.66%           
=======================================
  Files           4        4           
  Lines         156      156           
=======================================
  Hits          143      143           
  Misses         13       13           

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