class Net::SSH::Authentication::Session

def expect_message(type)

type. If it is not, an exception is raised.
Blocks until a packet is received, and returns it if it is of the given 
def expect_message(type)
  message = next_message
  raise Net::SSH::Exception, "expected #{type}, got #{message.type} (#{message})" unless message.type == type
  message
end