ci: add tests to JSON parsers

[wellwelwel]

Add tests to #2642.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.33%. Comparing base (9820fe5) to head (fab8576).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2720   +/-   ##
=======================================
  Coverage   90.33%   90.33%           
=======================================
  Files          71       71           
  Lines       15731    15731           
  Branches     1345     1345           
=======================================
  Hits        14210    14210           
  Misses       1521     1521           

Flag	Coverage Δ
compression-0	90.33% <ø> (ø)
compression-1	90.33% <ø> (ø)
tls-0	89.85% <ø> (ø)
tls-1	90.13% <ø> (ø)

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