[tests] Add a failing test that demonstrates wrong handling of data
[tests] Add a failing test that demonstrates wrong handling of data

The ping handler adds the data directly to the response_kwargs,
allowing internal kwargs to be overwritten.

`send_message()` and `build_message()` should not accept
`**additional_data`, but `additional_data: dict = None` instead.

axsemantics/rohrpost,axsemantics/rohrpost