Using FakeWeb to stub out HTTP requests made by a server process from Cucumber's remote runners (Selenium, Mechanize, etc.)

cucumber_fakeweb_hook.rb

# config/initializers/cucumber_fakeweb_hook.rb

# If this looks like a test server process, make its FakeWeb available to other
# processes via DRb. That way the test runner (which runs in a separate process)
# can dynamically register stubs for this server to use.

if Rails.env.cucumber? && defined?(PhusionPassenger)
  require 'drb'
  require 'fakeweb'
  DRb.start_service("druby://localhost:30010", FakeWeb)
  Rails.logger.info "=> Passenger's FakeWeb is available at #{DRb.uri}"
end

env.rb

# features/support/env.rb

require 'drb'
require 'fakeweb'

# Make Passenger's FakeWeb available here in the test runner, so we can register
# stubs for the server to use
DRb.start_service
$server_fakeweb = DRbObject.new(nil, "druby://localhost:30010")

Before do
  $server_fakeweb.clean_registry
  $server_fakeweb.allow_net_connect = false
end

fakeweb_steps.rb

# features/step_definitions/fakeweb_steps.rb

Given "the example site responds with a 200 OK" do
  $server_fakeweb.register_uri(:get, "http://example.com", :status => [200, "OK"])
end

Given "the example site responds with the following fixtures:" do |table|
  response_path = Rails.root.join("features/support/fakeweb/example_site")
  table.hashes.each do |stub|
    http_method, uri           = stub["HTTP method"].downcase.to_sym, stub["URI"]
    filename_of_saved_response = response_path.join(stub["response"])
    $server_fakeweb.register_uri(http_method, uri, :response => filename_of_saved_response)
  end
end