Fix tests

Signed-off-by: Michael Sauter <mail@michaelsauter.net>
Add test for container-only path

Signed-off-by: Michael Sauter <mail@michaelsauter.net>
Test RunParameters.Net()

Signed-off-by: Michael Sauter <mail@michaelsauter.net>
Test RunParameters.Cmd()

Signed-off-by: Michael Sauter <mail@michaelsauter.net>