require "spec_helper"
require "shamu/active_record"

class ObservableService < Shamu::Services::Service
  include Shamu::Services::ObservableSupport

  public :with_observers, :notify_observers
end

describe Shamu::Services::ObservableSupport do
  let( :service ) { scorpion.new ObservableService }
  let( :request ) { Shamu::Services::Request.new }
  let( :action )  { Shamu::Services::ObservedRequest.new request: request }


  describe "#notify_observers" do
    it "notifies all registered observers" do
      expect do |b|
        service.observe( &b )
        service.notify_observers action
      end.to yield_control
    end
  end

  describe "#with_observers" do
    it "notifies observers" do
      expect do |b|
        service.observe( &b )
        service.with_observers request do |req|
          Shamu::Services::Result.new request: req
        end
      end.to yield_control
    end

    it "does not yield if action was canceled" do
      expect do |b|
        service.observe do |a|
          a.request_cancel Shamu::Services::Result.new
        end
        service.with_observers( request, &b )
      end.not_to yield_control
    end

    it "reports an error indicating the request was canceled" do
      service.observe do |a|
        a.request_cancel Shamu::Services::Result.new
      end

      result = service.with_observers request

      expect( result ).not_to be_valid
      expect( result.errors.full_messages ).to include /canceled/
    end
  end
end