Introduction

Rack::Test

Rack::Test is a small, simple testing API for Rack apps. It can be used on its own or as a reusable starting point for Web frameworks and testing libraries to build on. Most of its initial functionality is an extraction of Merb 1.0's request helpers feature.

Features

  • Maintains a cookie jar across requests
  • Easily follow redirects when desired
  • Set request headers to be used by all subsequent requests
  • Small footprint. Approximately 200 LOC

Examples

require 'rack/test'

class HomepageTest < Test::Unit::TestCase
  include Rack::Test::Methods
  
  def app
    MyApp.new
  end
  
  def test_redirect_logged_in_users_to_dashboard
    authorize 'bryan', 'secret'
    get '/'
    follow_redirect!
    
    assert_equal "http://example.org/redirected", last_request.url
    assert last_response.ok?
  end
  
end

If you want to test one app in isolation, you just return that app as shown above. But if you want to test the entire app stack, including middlewares, cascades etc. you need to parse the app defined in config.ru.

OUTER_APP = Rack::Builder.parse_file('config.ru').first

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

  def app
    OUTER_APP
  end

  def test_root
    get '/'
    assert last_response.ok?
  end
  
end

Install

To install the latest release as a gem:

gem install rack-test

Or via Bundler:

gem "rack-test", require: "rack/test"