improved unit tests #251

Job	Run time
Windows (JDK 8)	5m 13s
Windows (JDK 17)	5m 23s
Linux (JDK 11), Pacific/Chatham Timezone	4m 8s
Linux (JDK 17)	6m 36s
Linux (JDK 8), latest Guava, America/New_York Timezone	7m 58s
Linux (JDK 8), oldest Guava, America/New_York Timezone	4m 15s
Linux (JDK 11), Avatica main	7m 18s
Linux (JDK 19)	6m 4s
macOS (JDK 19)	10m 16s
Error Prone (JDK 11), latest Guava	3m 55s
CheckerFramework (JDK 11)	9m 47s
CheckerFramework (JDK 11), oldest Guava	10m 13s
Druid Tests	7m 0s
Linux (JDK 8) Slow Tests	0s
	1h 28m 6s

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