Run Python tests

Add tests for the writer #257

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Run time

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Job	Run time
Run tests (3.8)	42s
Run tests (3.9)	41s
Run tests (3.11)	35s
Run tests (3.13)	37s
Run tests (3.12)	32s
Run tests (3.14)	45s
Run tests (3.10)	34s
	4m 26s