Cover `Dataframe::write_table` with unit tests

[comphead]

Is your feature request related to a problem or challenge?

We have a Dataframe::write_table which currently uncovered with tests
https://github.com/apache/arrow-datafusion/blob/main/datafusion/core/src/dataframe/mod.rs#L1026

Describe the solution you'd like

Add unit tests, we can take write_parquet or write_json as example

Describe alternatives you've considered

No response

Additional context

Follow up on #8527