See introductory blog post HERE.
require 'greenletters' adv = Greenletters::Process.new("adventure", :transcript => $stdout) # Install a handler which may be triggered at any time adv.on(:output, /welcome to adventure/i) do |process, match_data| adv << "no\n" end puts "Starting adventure..." adv.start! # Wait for the specified pattern before proceeding adv.wait_for(:output, /you are standing at the end of a road/i) adv << "east\n" adv.wait_for(:output, /inside a building/i) adv << "quit\n" adv.wait_for(:output, /really want to quit/i) adv << "yes\n" adv.wait_for(:exit) puts "Adventure has exited."
Or, in Cucumber format:
Given process activity is logged to "greenletters.log" Given a process "adventure" from command "adventure" Given I reply "no" to output "Would you like instructions?" from process "adventure" Given I reply "yes" to output "Do you really want to quit" from process "adventure" When I execute the process "adventure" Then I should see the following output from process "adventure": """ You are standing at the end of a road before a small brick building. Around you is a forest. A small stream flows out of the building and down a gully. """ When I enter "east" into process "adventure" Then I should see the following output from process "adventure": """ You are inside a building, a well house for a large spring. """
Greenletters is a console interaction automation library similar to GNU Expect. You can use it to script interactions with command-line programs.
Because Ruby’s built-in expect.rb is pretty underpowered and I wanted to drive command-line applications from Ruby, not TCL.
Greenletters is by Avdi Grimm.
Greenletters uses the pty.rb library under the covers to create a UNIX pseudoterminal under Ruby’s control. Of course, this means that it is MacOSX/Linux/*NIX-only; Windows users need not apply.
The advantage of using a PTY is that any output - including output written to the console instead of STDOUT/STDERR - will be captured by Greenletters.
To use the Cucumber steps in your own feature files, put the following in your env.rb:
require 'greenletters' require 'greenletters/cucumber_steps'
(The MIT License)
Copyright (c) 2010 Avdi Grimm
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