Add unit tests #2154

Job	Run time
smoke	3m 20s
gremlin-console	6m 29s
gremlin-server default	21m 29s
cache gremlin-server docker image	2m 0s
gremlin-server unified	22m 9s
mvn clean install - jdk11	16m 55s
mvn clean install - jdk17	14m 0s
mvn clean install - jdk8	13m 23s
neo4j-gremlin	8m 39s
spark core (ubuntu-latest)	11m 45s
spark gryo (ubuntu-latest)	9m 23s
spark core (windows-latest)	3m 41s
spark gryo (windows-latest)	3m 45s
.NET	6m 0s
javascript (ubuntu-latest)	4m 38s
go	5m 49s
gremlin-driver	4m 1s
python	5m 32s
	2h 42m 58s

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