Refactoring service retirement start_retirement method.

Refactoring Service/Retirement/StateMachines/Methods.class/methods/start_retirement.rb method with spec. This PR is based on the issue below.

#8

@miq-bot add_label refactoring
Made labels more descriptive and removed some useless tests as requested

content/automate/ManageIQ/Service/Retirement/StateMachines/Methods.class/__methods__/start_retirement.rb

@@ -1,26 +1,46 @@
-#
-# Description: This method sets the retirement_state to retiring
-#
+module ManageIQ
+  module Automate
+    module Service
+      module Retirement
+        module StateMachines
+          module Methods
+            class StartRetirement
+              def initialize(handle = $evm)
+                @handle = handle
+              end
 
-service = $evm.root['service']
-if service.nil?
-  $evm.log('error', "Service Object not found")
-  exit MIQ_ABORT
-end
+              def main
+                @handle.log('info', "Service Start Retirement for #{service.inspect}.try")
+                @handle.create_notification(:type => :service_retiring, :subject => service)
+                service.start_retirement
 
-$evm.log('info', "Service before start_retirement: #{service.inspect} ")
+                @handle.log('info', "Service after start_retirement: #{service.inspect} ")
+              end
 
-if service.retired?
-  $evm.log('error', "Service is already retired. Aborting current State Machine.")
-  exit MIQ_ABORT
-end
+              private
 
-if service.retiring?
-  $evm.log('error', "Service is in the process of being retired. Aborting current State Machine.")
-  exit MIQ_ABORT
+              def service
+                @service ||= @handle.root["service"].tap do |service|
+                  if service.nil?
+                    @handle.log(:error, 'Service Object not found')
+                    raise 'Service Object not found'
+                  end
+                  if service.retired?
+                    @handle.log(:error, 'Service is already retired. Aborting current State Machine.')
+                    raise 'Service is already retired. Aborting current State Machine.'
+                  end
+                  if service.retiring?
+                    @handle.log(:error, 'Service is in the process of being retired. Aborting current State Machine.')
+                    raise 'Service is in the process of being retired. Aborting current State Machine.'
+                  end
+                end
+              end
+            end
+          end
+        end
+      end
+    end
+  end
 end
 
-$evm.create_notification(:type => :service_retiring, :subject => service)
-service.start_retirement
-
-$evm.log('info', "Service after start_retirement: #{service.inspect} ")
+ManageIQ::Automate::Service::Retirement::StateMachines::Methods::StartRetirement.new.main

spec/content/automate/ManageIQ/Service/Retirement/StateMachines/Methods.class/__methods__/start_retirement_spec.rb

@@ -0,0 +1,75 @@
+require_domain_file
+
+describe ManageIQ::Automate::Service::Retirement::StateMachines::Methods::StartRetirement do
+  let(:admin) { FactoryBot.create(:user_admin) }
+  let(:request) { FactoryBot.create(:service_retire_request, :requester => admin) }
+  let(:service) { FactoryBot.create(:service) }
+  let(:task) { FactoryBot.create(:service_retire_task, :destination => service, :miq_request => request) }
+  let(:svc_task) { MiqAeMethodService::MiqAeServiceServiceRetireTask.find(task.id) }
+  let(:svc_service) { MiqAeMethodService::MiqAeServiceService.find(service.id) }
+  let(:root_object) do
+    Spec::Support::MiqAeMockObject.new('service'             => svc_service,
+                                       'service_retire_task' => svc_task)
+  end
+  let(:ae_service) do
+    Spec::Support::MiqAeMockService.new(root_object).tap do |service|
+      current_object = Spec::Support::MiqAeMockObject.new
+      current_object.parent = root_object
+      service.object = current_object
+    end
+  end
+
+  let(:svc_model_request) do
+    MiqAeMethodService::MiqAeServiceServiceRetireRequest.find(request.id)
+  end
+
+  it "#Service retiring - good" do
+    expect(service.retirement_state).to be_nil
+    service.start_retirement
+
+    expect(service.retirement_state).to eq("retiring")
+  end
+
+  it "starts retirement" do
+    allow(ae_service).to receive(:create_notification)
+  end
+
+  context "with no service" do
+    let(:root_object) do
+      Spec::Support::MiqAeMockObject.new('service'             => nil,
+                                         'service_retire_task' => svc_task)
+    end
+
+    it "raises the ERROR - Service Object not found" do
+      expect { described_class.new(ae_service).main }.to raise_error(
+        'Service Object not found'
+      )
+    end
+  end
+
+  it "raises the ERROR - Service is already retired. Aborting current State Machine." do
+    service.update(
+      :retired              => true,
+      :retirement_last_warn => Time.zone.now,
+      :retirement_state     => "retired"
+    )
+    service.reload
+
+    expect { described_class.new(ae_service).main }.to raise_error(
+      'Service is already retired. Aborting current State Machine.'
+    )
+  end
+
+  it "raises the ERROR - Service is in the process of being retired. Aborting current State Machine." do
+    service.update(
+      :retired              => false,
+      :retirement_last_warn => Time.zone.now,
+      :retirement_state     => "retiring"
+    )
+    service.reload
+
+    expect { described_class.new(ae_service).main }.to raise_error(
+      'Service is in the process of being retired. Aborting current State Machine.'
+    )
+  end
+end