Unit tests

Make `id` field within `Artist` optional #676

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Run time

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Job	Run time
unit_tests (macos-latest, 3.8)	47s
unit_tests (macos-latest, 3.9)	29s
unit_tests (macos-latest, 3.10)	31s
unit_tests (macos-latest, 3.11)	13s
unit_tests (macos-latest, 3.12)	17s
unit_tests (ubuntu-latest, 3.8)	25s
unit_tests (ubuntu-latest, 3.9)	18s
unit_tests (ubuntu-latest, 3.10)	18s
unit_tests (ubuntu-latest, 3.11)	17s
unit_tests (ubuntu-latest, 3.12)	18s
unit_tests (windows-latest, 3.8)	51s
unit_tests (windows-latest, 3.9)	40s
unit_tests (windows-latest, 3.10)	54s
unit_tests (windows-latest, 3.11)	1m 2s
unit_tests (windows-latest, 3.12)	53s
	8m 13s