sign users in/out in cucumber scenarios, without filling in a sign-in form each time (using warden, works with devise)

session.rb

# features/support/session.rb

# Sign-in users directly, without going through the sign-in form each time.
#
# Including the Warden::Test::Helpers in the cucumber world, allows us
# to call login_as(user, opts = {}) and logout(*scopes) in cucumber steps.
#
# http://git.io/h1NRxQ

Before do |scenario|
  Warden.test_mode!
end

After do |scenario|
  Warden.test_reset!
end

World(Warden::Test::Helpers)

session_steps.rb

# features/step_definitions/session_steps.rb

Given /^I am signed in$/ do
  user = User.create
  login_as(user)
end

…make sure to still test the sign-in form once in a separate feature.