Add unit tests around Chef::VersionString
Add unit tests around Chef::VersionString

I guess this is minimum viable testing to ensure this doesn't break in
the future.

Signed-off-by: Lamont Granquist <0ab8dc438f73addc98d9ad5925ec8f2b97991703@scriptkiddie.org>

nvwls/chef,chef/chef,MsysTechnologiesllc/chef,tas50/chef-1,chef/chef,nvwls/chef,higanworks/chef,gene1wood/chef,nvwls/chef,jaymzh/chef,mwrock/chef,nvwls/chef,chef/chef,chef/chef,mwrock/chef,jaymzh/chef,tas50/chef-1,jaymzh/chef,higanworks/chef,nvwls/chef,tas50/chef-1,mwrock/chef,mattray/chef,mattray/chef,tas50/chef-1,MsysTechnologiesllc/chef,gene1wood/chef,MsysTechnologiesllc/chef,mattray/chef,gene1wood/chef,higanworks/chef,higanworks/chef,nvwls/chef,mattray/chef,mattray/chef,gene1wood/chef,mwrock/chef,MsysTechnologiesllc/chef,jaymzh/chef,higanworks/chef