Set Eclipse/KNIME preferences before running test workflow

I would like to test nodes which require a prior configuration which would usually be specified by the user via Eclipse's PreferencePages. Are there any suggestions/best practices yet, how I could populate those preferences before running a (headless) test workflow?

The NGTestflowRunner application has a parameter -preferences where you can specify a preferences file.

If you need it in the nightly community tests we need to adapt the Jenkins jobs.

Thank you! I'll contact you during the next few days about this.