Is it possible to change the temporary directory used by planemo test?

The reason is that one of my xml tools uses ssh to connect to a machine specifically due to licensing requirements e.g.:

<command>

ssh address.com 'sh runCommand.sh $input' > $output

</command>

Unfortunately, when executing a planemo test, the input is copied into a local temporary directory (/tmp) which is of course different from the /tmp directory on the computer where the bash script is being executed. I've tried changing the TMP and TEMP environment variables to a location that is available to both machines but that hasn't worked.

Is there a workaround?

Thanks!