Test to validate custom JSON decoders

[chayim]

No description provided.

[codecov-commenter]

Codecov Report

Merging #1681 (cbd29c9) into master (f5160f5) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1681      +/-   ##
==========================================
+ Coverage   89.71%   89.72%   +0.01%     
==========================================
  Files          57       57              
  Lines       11186    11200      +14     
==========================================
+ Hits        10035    10049      +14     
  Misses       1151     1151              

Impacted Files	Coverage Δ
tests/test_json.py	100.00% <100.00%> (ø)

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