Run Python tests

Add tests for the writer #253

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Run time

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Job	Run time
Run tests (3.8)	38s
Run tests (3.9)	38s
Run tests (3.10)	39s
Run tests (3.11)	38s
Run tests (3.14)	29s
Run tests (3.12)	35s
Run tests (3.13)	40s
	4m 17s