gistfile1.rb

# Rack env specification:
# http://rack.rubyforge.org/doc/SPEC.html
# https://github.com/rack/rack/blob/master/SPEC

# How to get fake env hash:
# http://rack.rubyforge.org/doc/Rack/MockRequest.html#env_for-method

env = Rack::MockRequest.env_for('/test')

# Devise with Warden

warden_manager = Warden::Manager.new({})
warden_proxy = Warden::Proxy.new(app = {}, warden_manager)

# Simulate controller#action call:

SomeController.action('some_action').call(env.merge({ 'warden' => warden_proxy }))