Increasing test coverage?

[danielinteractive]

Hi @aphalo , first of all thanks for the nice package, really useful extensions here!

One question - we are currently looking into this package (actually only a few of its functions) to use for cases where we need to "validate" the packages. Without going into details, the hard requirement there is to have sufficient unit test coverage of the package. So currently we see around 20% test coverage in ggpp. But we would need at least 80% overall, and each function tested at least with one test, to get through our requirements.

I was wondering - would you be open to us contributing tests via PRs? Since that seems the most straightforward way.

Cheers Daniel