parallelize test_json

[Niraj-Kamdar]

test_json can now be run in parallel with pytest -n 4 test/test_json.py:

=================================================== 19 passed, 4 warnings in 85.99s (0:01:25) ====================================================

It is significantly faster now. Past implementation was taking roughly 10 minutes to run.

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 85.71429% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 88.31%. Comparing base (ca4b2d9) to head (e560fb3).

Files with missing lines	Patch %	Lines
test/test_json.py	85.71%	3 Missing ⚠️
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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #772      +/-   ##
==========================================
- Coverage   88.33%   88.31%   -0.03%     
==========================================
  Files         137      137              
  Lines        2478     2473       -5     
  Branches      302      301       -1     
==========================================
- Hits         2189     2184       -5     
  Misses        225      225              
  Partials       64       64              

Flag	Coverage Δ
longtests	88.31% <85.71%> (-0.03%)	⬇️

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[terriko]

This is a great improvement, thank you!