create error in case of permission problems
We've seen cases where a git cmd (here fetch) will freeze forever, since a passphrase was set in the ssh keys, but ssh-agent was not running.
- find a way to test, if accessing the repo is working (git fetch --dry-run?)
- make sure, that the test outputs a speaking error
- make sure, that the test will not freeze the system
- add that test to the Set Working Directory.vi
Info for manual testing: PowerShell may react different than git shell.
Edited by Alexander Elbert