Add tests for reading and writing digital lines with varying lines pe… #1252

Job	Run time
Run CI / Build / Build	58s
Run CI / Run unit tests / Run unit tests (ubuntu-latest, 3.8)	42s
Run CI / Generate docs / Generate docs	55s
Run CI / Run unit tests / Run unit tests (ubuntu-latest, 3.9)	46s
Run CI / Run unit tests / Run unit tests (ubuntu-latest, 3.10)	46s
Run CI / Run unit tests / Run unit tests (ubuntu-latest, 3.11)	40s
Run CI / Run unit tests / Run unit tests (ubuntu-latest, 3.12)	56s
Run CI / Run unit tests / Run unit tests (windows-latest, 3.8)	1m 22s
Run CI / Run unit tests / Run unit tests (windows-latest, 3.9)	1m 22s
Run CI / Run unit tests / Run unit tests (windows-latest, 3.10)	1m 18s
Run CI / Run unit tests / Run unit tests (windows-latest, 3.11)	1m 41s
Run CI / Run unit tests / Run unit tests (windows-latest, 3.12)	1m 26s
Run CI / Run system tests / Run system tests (win-10-py32)	35m 50s
Run CI / Run system tests / Run system tests (win-10-py64)	36m 35s
Run CI / Report test results / Report test results	14s
	1h 25m 31s

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