Added some unit tests that fake read access to the Handle Server.
Added some unit tests that fake read access to the Handle Server.

cookie33/B2HANDLE,TobiasWeigel/B2HANDLE,cookie33/B2HANDLE,EUDAT-B2SAFE/B2HANDLE,merretbuurman/B2HANDLE,EUDAT-B2SAFE/B2HANDLE,TobiasWeigel/B2HANDLE,merretbuurman/B2HANDLE