demo_app.rb

require 'rubygems'
require 'sinatra'
require 'consistenturls'

#plugin 
validate_url_requests

get '/' do
   "Hello World"
end

get %r{(.+)} do |catch_all|
    "I am the catch all #{catch_all}<br />#{request.url}"
end

not_found do
  "The path #{request.url} does not exist"
end

tests.rb

require 'demo_app'
require 'test/unit'
require 'rack/test'

set :environment, :test

class ConsistentUrlsTests < Test::Unit::TestCase
  include Rack::Test::Methods

  def app
    @app || Sinatra::Application
  end
  
  def test_urls_with_trailing_slashes_will_be_redirected
    execute_url_test('/some-random-url/', '/some-random-url')
    execute_url_test('/some-random-url/second-path/', '/some-random-url/second-path')  
  end
  
  def test_urls_with_trailing_slashes_and_querystrings_will_be_redirected
    execute_url_test('/some-random-url/?abc=123', '/some-random-url?abc=123')
    execute_url_test('/some-random-URL/?abc=123&z=abc', '/some-random-url?abc=123&z=abc')
  end
  
  def test_case_sensitive_url_will_be_redirected
    execute_url_test('/CAPS-LOCK-ROCKS', '/caps-lock-rocks')
  end 
  
  def test_case_sensitive_url_with_trailing_slash_will_be_redirected
    execute_url_test('/CAPS-LOCK-ROCKS/', '/caps-lock-rocks')
  end 
  
  def test_case_sensitive_url_with_query_string_will_be_redirected
    execute_url_test('/CAPS-LOCK-ROCKS?abc=123&def=HIJ', '/caps-lock-rocks?abc=123&def=HIJ')
    execute_url_test('/CAPS-LOCK-ROCKS/ROCKS/It/ROCKs/?abc=123&def=HIJ', '/caps-lock-rocks/rocks/it/rocks?abc=123&def=HIJ')
  end 
  
  def execute_url_test(url_to_test, expected_redirect)
    get url_to_test
    follow_redirect!
    assert_equal last_request.url, 'http://example.org' + expected_redirect
  end
  
end