Ruby

Add simple rspec tests to json_endpoint (#105) #103

Job	Run time
Rubocop	3m 12s
test (2.7)	3m 20s
test (3.0)	1m 44s
test (3.1)	1m 25s
test (3.2)	1m 25s
test (3.3)	1m 21s
Build and Publish to Rubygems	0s
	12m 27s

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