Tests

Add writing functionality for dataframes #330

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Run time

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Job	Run time
Python 3.9 on ubuntu-latest	25s
Python 3.10 on ubuntu-latest	29s
Python 3.11 on ubuntu-latest	25s
Python 3.12 on ubuntu-latest	34s
Python 3.9 on macos-latest	36s
Python 3.10 on macos-latest	39s
Python 3.11 on macos-latest	21s
Python 3.12 on macos-latest	22s
Python 3.9 on windows-latest	1m 8s
Python 3.10 on windows-latest	1m 3s
Python 3.11 on windows-latest	59s
Python 3.12 on windows-latest	57s
	7m 58s