Runing the blueocean plugin within a JenkinsPipelineUnit testcase

Question

I'd like to use JenkinsPipelineUnit to test our Jenkins pipeline. We use the "blueocean" plugin in production. So, to test our Jenkins pipeline file, I need to do this:

   import io.jenkins.blueocean.rest.impl.pipeline.FlowNodeWrapper

That seems like it should be super simple; however, I cannot figure out the magic combination of keystrokes in my build.gradle file and my "DeclarativePipelineTest" implementation that allows the above line to work. gradle test just reports that it cannot resolve the import!

The JenkinsPipelineUnit page on github only mentions plugins once, and only to say that a few widely used plugins are included!

So my question is: can I even do this? Does JenkinsPipelineUnit support plugins? Where's the documentation?

Thanks!