gistfile1.rb

#This should insert all the rack test methods into your current test context.  
#Modify as appropriate for your specific test framework.  
#If you're including the Sinatra::Test in each of your tests, you'll need to 
#include Rack::Test::Methods instead.

Test::Unit::TestCase.send :include, Sinatra::Test

#becomes

Test::Unit::TestCase.send :include, Rack::Test::Methods

gistfile2.rb

#This is a pretty minor change, but probably needs to be changed in 
#all of your sinatra tests.

before { @app = Web::Application }

#becomes

def app
	Web::Application
end

gistfile3.rb

#The biggest change, is that Rack::Test doesn't include a method_missing hook.  
#This means that this code:

body.should.include 'error'

#becomes

last_response.body.should.include 'error'