Add sinatra demo

.rvmrc

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+rvm use --create 1.9.2@sinatra_test

Gemfile

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+source :rubygems
+
+gem 'sinatra'
+
+group :test do
+  gem 'capybara'
+  gem 'spinach'
+end

Gemfile.lock

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+GEM
+  remote: http://rubygems.org/
+  specs:
+    capybara (1.1.1)
+      mime-types (>= 1.16)
+      nokogiri (>= 1.3.3)
+      rack (>= 1.0.0)
+      rack-test (>= 0.5.4)
+      selenium-webdriver (~> 2.0)
+      xpath (~> 0.1.4)
+    childprocess (0.2.2)
+      ffi (~> 1.0.6)
+    colorize (0.5.8)
+    ffi (1.0.9)
+    gherkin (2.5.1)
+      json (>= 1.4.6)
+    json (1.6.1)
+    json_pure (1.6.1)
+    mime-types (1.16)
+    minitest (2.6.0)
+    nokogiri (1.5.0)
+    rack (1.3.3)
+    rack-test (0.6.1)
+      rack (>= 1.0)
+    rubyzip (0.9.4)
+    selenium-webdriver (2.7.0)
+      childprocess (>= 0.2.1)
+      ffi (>= 1.0.7)
+      json_pure
+      rubyzip
+    sinatra (1.2.6)
+      rack (~> 1.1)
+      tilt (< 2.0, >= 1.2.2)
+    spinach (0.0.2)
+      colorize
+      gherkin
+      minitest
+    tilt (1.3.3)
+    xpath (0.1.4)
+      nokogiri (~> 1.3)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  capybara
+  sinatra
+  spinach

app.rb

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+require 'bundler/setup'
+require 'sinatra'
+
+get '/' do
+  '<p>Hello world!</p><a href="/goodbye">goodbye</a>'
+end
+
+get '/goodbye' do
+  'Goodbye!'
+end

features/steps/test.rb

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+class Test < Spinach::Feature
+  feature "Application test"
+
+  Given "I am on the front page" do
+    visit '/'
+  end
+
+  Then "I should see a salutation" do
+    page.has_content?("Hello").must_equal true
+  end
+
+  When "I click on the first link" do
+    page.find("a:first").click
+  end
+
+  Then "I should see goodbye" do
+    page.has_content?("Goodbye").must_equal true
+  end
+end

features/support/env.rb

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+require 'spinach/capybara'
+
+require_relative '../../app'
+
+Capybara.app = Sinatra::Application

features/test_feature.feature

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+Feature: Application test
+
+  Scenario: Hello world
+    Given I am on the front page
+    Then I should see a salutation
+
+  Scenario: Goodbye
+    Given I am on the front page
+    When I click on the first link
+    Then I should see goodbye