Unit tests

Make `id` field within `Artist` optional #677

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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)	32s
unit_tests (macos-latest, 3.10)	28s
unit_tests (macos-latest, 3.11)	14s
unit_tests (macos-latest, 3.12)	14s
unit_tests (ubuntu-latest, 3.8)	24s
unit_tests (ubuntu-latest, 3.9)	20s
unit_tests (ubuntu-latest, 3.10)	19s
unit_tests (ubuntu-latest, 3.11)	20s
unit_tests (ubuntu-latest, 3.12)	19s
unit_tests (windows-latest, 3.8)	1m 6s
unit_tests (windows-latest, 3.9)	47s
unit_tests (windows-latest, 3.10)	49s
unit_tests (windows-latest, 3.11)	58s
unit_tests (windows-latest, 3.12)	51s
	8m 28s