test: Refactoring test JSON marshalling.

[alexec]

No description provided.

[codecov]

Codecov Report

Merging #5785 (d64ea84) into master (cb55cba) will decrease coverage by 0.17%.
The diff coverage is 15.38%.

@@            Coverage Diff             @@
##           master    #5785      +/-   ##
==========================================
- Coverage   46.93%   46.76%   -0.18%     
==========================================
  Files         244      245       +1     
  Lines       15313    15350      +37     
==========================================
- Hits         7187     7178       -9     
- Misses       7219     7262      +43     
- Partials      907      910       +3     

Impacted Files	Coverage Δ
pkg/apis/workflow/v1alpha1/marshall.go	10.81% <10.81%> (ø)
workflow/hydrator/fake/always.go	100.00% <100.00%> (ø)
workflow/metrics/server.go	12.50% <0.00%> (-4.17%)	⬇️
server/workflow/workflow_server.go	40.45% <0.00%> (-2.28%)	⬇️
workflow/controller/operator.go	70.85% <0.00%> (-0.27%)	⬇️
cmd/argo/commands/get.go	56.95% <0.00%> (+0.64%)	⬆️

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