Code snippets for rails workflow

1_integration_test_in_comments_spec.rb

describe "Amazon bounce handling process" do
  # We have subscriptions on email "my@gmail.com" in different clients
  # When last email to him was returned with "permanent failure"
  # Then all subscription on email "my@gmail.com" are marked as bounced
end

2_executable_test_spec.rb

describe "Amazon bounce handling process" do
  it "marks all subcriptions as bounced on permanent failure notifications" do
    # Given
    different_active_subscription_on("my_email@gmail.com")

    # When
    receive_permanent_failure_notification(on_receiver: "my_email@gmail.com")

    # Then
    all_subscriptions_on("my_email@gmail.com").should be_bounced
  end
end

3_failing_test.rb

# custom rspec matchers

matcher :be_bounced do
  match do |actual_subscriptions|
    actual_subscriptions.all? do |subscription|
      subscription.status == "bounced"
    end
  end
end

# integration spec
def different_active_subscription_on(email)
  subscriber_1 = create(:subscriber, email: email, client: create(:client))
  subscriber_2 = create(:subscriber, email: email, client: create(:client))
  # ... subscription1, subscription2
end

def receive_permanent_failure_notification(options)
  post "/amazon_sns/bounces", permanent_failure_raw_data(options), {
    "CONTENT_TYPE" => 'text/plain'
  }
end

def permanent_failure_raw_data(options)
  '{
     "notificationType":"Bounce",' # ....
end


# in routung
namespace :amazon_sns do
  post "bounces", :to => "bounce_listeners#handle"
end

# basic controller
class AmazonSns::BounceListenersController < ApplicationController
  def handle
    render :nothing => true
  end
end

architecture_design.rb

class AmazonSns::BounceListenersController < ApplicationController
  def handle
    bounce_object = bounce_parser(request_data)
    bounce_handler.handle(bounce_object)

    # bounce_handler
    bounce_object.emails.each do |email|
      subscription_marker.mark_as_bounced(email)
    end

    render :nothing => true
  end
end