Tests

Add return type hint #59

Job	Run time
8.1 unit	1m 30s
8.1 integration legacy	57s
8.1 integration solr 7.7.3 single	9m 40s
8.1 integration solr 7.7.3 dedicated	7m 22s
8.1 integration solr 7.7.3 shared	8m 54s
8.1 integration solr 7.7.3 cloud	8m 25s
8.1 integration solr 7.7.3 regression single	20m 18s
8.1 integration solr 7.7.3 regression dedicated	35m 53s
8.1 integration solr 7.7.3 regression shared	24m 47s
8.1 integration solr 7.7.3 regression cloud	29m 31s
8.1 integration solr 8.11.2 single	9m 47s
8.1 integration solr 8.11.2 dedicated	14m 8s
8.1 integration solr 8.11.2 shared	11m 47s
8.1 integration solr 8.11.2 cloud	15m 47s
8.1 integration solr 8.11.2 regression single	24m 59s
8.1 integration solr 8.11.2 regression dedicated	23m 7s
8.1 integration solr 8.11.2 regression shared	27m 33s
8.1 integration solr 8.11.2 regression cloud	27m 40s
	5h 2m 5s

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