Sinatra + Cucumber + Webrat

env.rb

require 'spec/expectations'
require 'webrat'
Webrat.configure do |config|
  config.mode = :sinatra
end

World do
  Webrat::SinatraSession.new
end

hello.rb

require 'sinatra'

get '/' do
  "Hello, world!"
end

hello_steps.rb

Given /^I am viewing "(.+)"$/ do |url|
  visit(url)
end

Then /^I should see "(.+)"$/ do |text|
  response_body.should =~ Regexp.new(Regexp.escape(text))
end

home.feature

Feature: view pages

  Scenario: Home page
    Given I am viewing "/"
    Then I should see "Hello, world!"

Rakefile

require 'rubygems'
require 'cucumber/rake/task'

Cucumber::Rake::Task.new(:features) do |t|
  t.cucumber_opts = "--format pretty" 
end