Integration Testing Cleanup for Metal

(from [97a178bfa4d5101dca73ae931cc9c77385d8c97e]) Decorate responses from Rack Middleware and Rails Metal for the purposes of integration testing. A test for the following Metal:

class Poller < Rails::Rack::Metal
  def call(env)
    if env["PATH_INFO"] =~ /^\/poller/
      [200, {"Content-Type" => "text/plain"}, "Hello World!"]
    else
      super
    end
  end
end

might be tested like so:

class PollerTest < ActionController::IntegrationTest

test "poller returns hello world" do
  get "/poller"
  assert_response 200
  assert_response :success
  assert_response :ok
  assert_equal "Hello World!", response.body
end

end

[#1588 Integration Testing Cleanup for Metal state:committed]

Signed-off-by: David Heinemeier Hansson david@loudthinking.com http://github.com/rails/rails/co...