Test

Add `show-ref` subcommand #444

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Run time

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Job	Run time
Build and test (ubuntu-latest)	1m 17s
Build and test (macos-latest)	1m 54s
Test coverage	3m 6s
Build and test (ubuntu-latest)	1m 15s
Test coverage	3m 6s
Build and test (macos-latest)	1m 54s
	12m 32s