Run Python tests

Add tests for the writer #237

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Run time

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Job	Run time
Run tests (3.11)	36s
Run tests (3.9)	33s
Run tests (3.8)	35s
Run tests (3.10)	36s
Run tests (3.14)	41s
Run tests (3.13)	34s
Run tests (3.12)	32s
	4m 7s