Improve code style and docs of job

app/jobs/order_cycle_notification_job.rb

@@ -1,6 +1,9 @@
+# Deliers an email with a report of the order cycle to each of its suppliers
 OrderCycleNotificationJob = Struct.new(:order_cycle_id) do
   def perform
-    order_cycle = OrderCycle.find order_cycle_id
-    order_cycle.suppliers.each { |supplier| ProducerMailer.order_cycle_report(supplier, order_cycle).deliver }
+    order_cycle = OrderCycle.find(order_cycle_id)
+    order_cycle.suppliers.each do |supplier|
+      ProducerMailer.order_cycle_report(supplier, order_cycle).deliver
+    end
   end
 end

app/mailers/producer_mailer.rb

@@ -12,12 +12,14 @@ class ProducerMailer < Spree::BaseMailer
 
     subject = "[#{Spree::Config.site_name}] #{I18n.t('producer_mailer.order_cycle.subject', producer: producer.name)}"
 
-    if has_orders? order_cycle, producer
-      mail(to: @producer.contact.email,
-           from: from_address,
-           subject: subject,
-           reply_to: @coordinator.contact.email,
-           cc: @coordinator.contact.email)
+    if has_orders?(order_cycle, producer)
+      mail(
+        to: @producer.contact.email,
+        from: from_address,
+        subject: subject,
+        reply_to: @coordinator.contact.email,
+        cc: @coordinator.contact.email
+      )
     end
   end
 
@@ -30,7 +32,7 @@ class ProducerMailer < Spree::BaseMailer
 
   def line_items_from(order_cycle, producer)
     Spree::LineItem.
-      joins(:order => :order_cycle, :variant => :product).
+      joins(order: :order_cycle, variant: :product).
       where('order_cycles.id = ?', order_cycle).
       merge(Spree::Product.in_supplier(producer)).
       merge(Spree::Order.by_state('complete'))

spec/jobs/order_cycle_notification_job_spec.rb

@@ -2,11 +2,14 @@ require 'spec_helper'
 
 describe OrderCycleNotificationJob do
   let(:order_cycle) { create(:order_cycle) }
+  let(:mail) { double(:mail, deliver: true) }
 
-  it "sends a mail to each supplier" do
-    mail = double(:mail)
-    allow(mail).to receive(:deliver)
-    expect(ProducerMailer).to receive(:order_cycle_report).twice.and_return(mail)
+  before do
+    allow(ProducerMailer).to receive(:order_cycle_report).twice.and_return(mail)
+  end
+
+  it 'sends a mail to each supplier' do
     run_job OrderCycleNotificationJob.new(order_cycle.id)
+    expect(ProducerMailer).to have_received(:order_cycle_report).twice
   end
 end