Add test case for JSON resource marshaling

[rahulkarmore]

Hi creator,
Added test cases for JSON Resources :
ExternalGroup
Helps: #55

I have followed all the guidelines to contribute to this repository.
Please revert in case of any changes are needed.
I am a first-time contributor to Hackoctober, It will be a great help if u can encourage me & accept my contribution.

[gmlewis]

Thank you, @rahulkarmore !
LGTM.

Waiting for GitHub Actions to perform all checks before merging.

[gmlewis]

@rahulkarmore - if GitHub Actions doesn't kick in within an hour or so, please feel free to tweak one of your constants in your PR and push the change to this PR... hopefully that will kick GHA into gear... it looks like it is currently either having issues or is just sleeping. 😁

[gmlewis]

Thank you, @rahulkarmore ! Do you want to resolve the conflicts by merging in the master branch (again), or would you like me to do that?

[codecov]

Codecov Report

Merging #2541 (92a2236) into master (cb9253a) will not change coverage.
The diff coverage is n/a.

❗ Current head 92a2236 differs from pull request most recent head f05ba3d. Consider uploading reports for the commit f05ba3d to get more accurate results

@@           Coverage Diff           @@
##           master    #2541   +/-   ##
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  Coverage   97.97%   97.97%           
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  Files         123      123           
  Lines       10813    10813           
=======================================
  Hits        10594    10594           
  Misses        150      150           
  Partials       69       69           

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[rahulkarmore]

resolved conflict