make sure samples is a list (#609) #964

Job	Run time
Run unit tests (3.11, ubuntu-latest, .[compat_tests])	7m 17s
Run unit tests (3.9, ubuntu-latest, .[tests])	14m 5s
Run unit tests (3.9, windows-latest, .[compat_tests])	9m 19s
Run unit tests (3.9, windows-latest, .[tests])	15m 15s
Run unit tests (3.12, windows-latest, .[compat_tests])	12m 52s
Run unit tests (3.10, windows-latest, .[compat_tests])	4m 27s
Run unit tests (3.11, ubuntu-latest, .[tests])	13m 56s
Run unit tests (3.11, windows-latest, .[compat_tests])	4m 25s
Run unit tests (3.11, windows-latest, .[tests])	16m 13s
Run unit tests (3.9, ubuntu-latest, .[compat_tests])	6m 58s
Run unit tests (3.12, ubuntu-latest, .[tests])	13m 7s
Run unit tests (3.10, windows-latest, .[tests])	15m 16s
Run unit tests (3.12, ubuntu-latest, .[compat_tests])	17m 23s
Run unit tests (3.10, ubuntu-latest, .[tests])	14m 26s
Run unit tests (3.10, ubuntu-latest, .[compat_tests])	7m 48s
Run unit tests (3.12, windows-latest, .[tests])	18m 41s
	3h 11m 28s

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