Unit test

rework `@test_reference` messages - drop lena #191

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Run time

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Job	Run time
test (1.6, ubuntu-latest, x64)	4m 36s
test (1, ubuntu-latest, x64)	4m 23s
test (nightly, ubuntu-latest, x64)	2m 39s
test (windows-latest, 1, x64)	6m 3s
test (macOS-latest, 1, x64)	3m 59s
	21m 40s