Inject a user into a session for integration and controller tests.

Inspired by thoughtbot's clearance gem

Add this line to your application's Gemfile:

gem 'rack-back_door'

And then execute:

$ bundle

Or install it yourself as:

$ gem install rack-back_door

By default, Rack::BackDoor will handle the following URL:

http://example.com?as=1

By injecting 1 into the session as user_id

session[:user_id]   # => 1

Add the middleware to your stack in the config/environments/test.rb file

# config/environments/test.rb

MyApplication::Application.configure do |config|
# ...
  config.middleware.use Rack::BackDoor
# ...
end

Add to your sinatra application:

# app.rb
class MySinatraApplication < Sinatra::Base
  enable :sessions
  use Rack::BackDoor if environment == :test
  # ...
end

If you use rspec you may prefer to inject middleware only for rspec tests:

Put into spec/spec_helper.rb:

# spec/spec_helper.rb
MySinatraApplication.configure do
  use Rack::BackDoor
end

You can configure the following:

• session_key - The key used to hold the user_id in the session
• url_parameter - The query parameter the middleware will use as the user_id value

When configured with these values and passed the following URL

http://example.com?login=1

The middleware will set the session like so

session[:user]  #=> 1

To configure the middleware in a sinatra app:

# app.rb
class MySinatraApplication < Sinatra::Base
  enable :sessions

  if environment == "test"
    use Rack::BackDoor, session_key: "user", url_parameter: "login"
  end

  # ...
end

To configure the middleware in a rails app:

# config/test.rb
MyApplication::Application.configure do |config|
# ...
  config.middleware.use "Rack::BackDoor", session_key: "user", url_parameter: "login"
# ...
end

Additionally, you can override the middleware to alter the rack request any way you see fit by configuring the middleware with a block.

For instance, in sinatra:

use Rack::BackDoor do |env, user_id|
  env['my.user'] = User.find(user_id)
end

1. Fork it
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create new Pull Request