This is inspired by the httptest package and provides a simple rig to test SSH libraries. It starts a local server, that can be configured to a certain extent.
A word of warning: This is more of an experiment, than something I'd use in production. At least not without some proper review and some major refinements.
And a note on closing sessions: usually that is done by the server after the
command exited. This in turn means, that a client, gracefully closing the
session will receive an io.EOF error.