Unit Tests

Change default log level to `ERROR` and make some errors more descriptive #341

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Run time

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Job	Run time
test (20, macos-latest)	1m 31s
test (20, ubuntu-latest)	46s
test (20, windows-latest)	1m 37s
test (18, macos-latest)	1m 56s
test (18, ubuntu-latest)	49s
test (18, windows-latest)	1m 38s
	8m 17s