test that the versionname value is set properly

I managed to write a test that covers the line I modified. Warning: I understood very little about the code I have been testing, which means my test makes probably little sense. @dbu : do you see any improvement I could add to it ?
why would that be "test"? the test fails because its v2, which is to be expected.

i wonder if it semantically makes sense that we merge this field. afaik the versionName is read only, you can't chose it manually. the only thing you could set manually is a version "label" on the VersionHistory, if that feature would be implemented in jackalope-jackrabbit. maybe what we really ought to do is skip that field?