Test

Refactors interface the `MACHashBase` to always have the sink initial… #201

Job	Run time
test-on-legacy (ubuntu-latest, 2.14)	3m 5s
test-on-stable (ubuntu-latest, stable)	20s
test-on-beta (ubuntu-latest, beta)	27s
coverage (ubuntu-latest, stable)	1m 9s
test-on-stable (macos-latest, stable)	23s
test-on-legacy (windows-latest, 2.14)	3m 3s
test-on-stable (windows-latest, stable)	22s
	8m 49s

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