Run Python tests

Add tests for the writer #247

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Run time

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Job	Run time
Run tests (3.8)	41s
Run tests (3.10)	33s
Run tests (3.14)	39s
Run tests (3.9)	38s
Run tests (3.11)	33s
Run tests (3.13)	38s
Run tests (3.12)	41s
	4m 23s