Unit tests

Make `id` field within `Artist` optional #679

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Run time

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Job	Run time
unit_tests (macos-latest, 3.8)	56s
unit_tests (macos-latest, 3.9)	30s
unit_tests (macos-latest, 3.10)	33s
unit_tests (macos-latest, 3.11)	16s
unit_tests (macos-latest, 3.12)	17s
unit_tests (ubuntu-latest, 3.8)	24s
unit_tests (ubuntu-latest, 3.9)	20s
unit_tests (ubuntu-latest, 3.10)	21s
unit_tests (ubuntu-latest, 3.11)	19s
unit_tests (ubuntu-latest, 3.12)	18s
unit_tests (windows-latest, 3.8)	50s
unit_tests (windows-latest, 3.9)	38s
unit_tests (windows-latest, 3.10)	47s
unit_tests (windows-latest, 3.11)	52s
unit_tests (windows-latest, 3.12)	42s
	8m 3s