Run Python tests

Add tests for the writer #231

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Run time

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Job	Run time
Run tests (3.9)	17s
Run tests (3.11)	14s
Run tests (3.10)	19s
Run tests (3.8)	17s
Run tests (3.13)	13s
Run tests (3.14)	19s
Run tests (3.12)	18s
	1m 57s