Add system note for issue type changes

Changelog: added

app/helpers/system_note_helper.rb

@@ -39,7 +39,8 @@ module SystemNoteHelper
     'alert_issue_added' => 'issues',
     'new_alert_added' => 'warning',
     'severity' => 'information-o',
-    'cloned' => 'documents'
+    'cloned' => 'documents',
+    'issue_type' => 'pencil-square'
   }.freeze
 
   def system_note_icon_name(note)

app/services/issues/update_service.rb

@@ -77,6 +77,7 @@ module Issues
       end
 
       handle_severity_change(issue, old_severity)
+      handle_issue_type_change(issue)
     end
 
     def handle_assignee_changes(issue, old_assignees)
@@ -218,6 +219,16 @@ module Issues
     def remove_incident_label?(issue)
       issue.issue_type != params[:issue_type] && issue.incident?
     end
+
+    def handle_issue_type_change(issue)
+      return unless issue.previous_changes.include?('issue_type')
+
+      do_handle_issue_type_change(issue)
+    end
+
+    def do_handle_issue_type_change(issue)
+      SystemNoteService.change_issue_type(issue, current_user)
+    end
   end
 end
 

app/services/system_note_service.rb

@@ -331,6 +331,10 @@ module SystemNoteService
     ::SystemNotes::AlertManagementService.new(noteable: alert, project: alert.project).log_resolving_alert(monitoring_tool)
   end
 
+  def change_issue_type(issue, author)
+    ::SystemNotes::IssuablesService.new(noteable: issue, project: issue.project, author: author).change_issue_type
+  end
+
   private
 
   def merge_requests_service(noteable, project, author)

app/services/system_notes/issuables_service.rb

@@ -380,6 +380,12 @@ module SystemNotes
       create_resource_state_event(status: 'closed', close_auto_resolve_prometheus_alert: true)
     end
 
+    def change_issue_type
+      body = "changed issue type to #{noteable.issue_type.humanize(capitalize: false)}"
+
+      create_note(NoteSummary.new(noteable, project, author, body, action: 'issue_type'))
+    end
+
     private
 
     def cross_reference_note_content(gfm_reference)

ee/app/services/ee/issues/update_service.rb

@@ -36,7 +36,6 @@ module EE
         super
 
         handle_iteration_change(issue)
-        handle_issue_type_change(issue)
       end
 
       private
@@ -55,8 +54,9 @@ module EE
         end
       end
 
-      def handle_issue_type_change(issue)
-        return unless issue.previous_changes.include?('issue_type')
+      override :do_handle_issue_type_change
+      def do_handle_issue_type_change(issue)
+        super
 
         ::IncidentManagement::Incidents::CreateSlaService.new(issue, current_user).execute
       end

ee/spec/services/ee/issues/update_service_spec.rb

@@ -179,10 +179,24 @@ RSpec.describe Issues::UpdateService do
       end
 
       context 'from issue to incident' do
-        it 'creates an SLA' do
-          expect { update_issue(issue_type: 'incident') }.to change(IssuableSla, :count).by(1)
-          expect(issue.reload).to be_incident
-          expect(issue.reload.issuable_sla).to be_present
+        shared_examples 'creates an SLA' do
+          it do
+            expect { update_issue(issue_type: 'incident') }.to change(IssuableSla, :count).by(1)
+            expect(issue.reload).to be_incident
+            expect(issue.reload.issuable_sla).to be_present
+          end
+        end
+
+        it_behaves_like 'creates an SLA'
+
+        context 'system note fails to be created' do
+          before do
+            expect_next_instance_of(Note) do |note|
+              expect(note).to receive(:valid?).and_return(false)
+            end
+          end
+
+          it_behaves_like 'creates an SLA'
         end
       end
 

spec/services/issues/update_service_spec.rb

@@ -189,6 +189,14 @@ RSpec.describe Issues::UpdateService, :mailer do
             expect(issue.labels.pluck(:title)).to eq(['incident'])
           end
 
+          it 'creates system note about issue type' do
+            update_issue(issue_type: 'incident')
+
+            note = find_note('changed issue type to incident')
+
+            expect(note).not_to eq(nil)
+          end
+
           context 'for an issue with multiple labels' do
             let(:issue) { create(:incident, project: project, labels: [label_1]) }
 

spec/services/system_note_service_spec.rb

@@ -793,4 +793,16 @@ RSpec.describe SystemNoteService do
       described_class.log_resolving_alert(alert, monitoring_tool)
     end
   end
+
+  describe '.change_issue_type' do
+    let(:incident) { build(:incident) }
+
+    it 'calls IssuableService' do
+      expect_next_instance_of(::SystemNotes::IssuablesService) do |service|
+        expect(service).to receive(:change_issue_type)
+      end
+
+      described_class.change_issue_type(incident, author)
+    end
+  end
 end

spec/services/system_notes/issuables_service_spec.rb

@@ -773,4 +773,16 @@ RSpec.describe ::SystemNotes::IssuablesService do
       expect(event.state).to eq('closed')
     end
   end
+
+  describe '#change_issue_type' do
+    let(:noteable) { create(:incident, project: project) }
+
+    subject { service.change_issue_type }
+
+    it_behaves_like 'a system note' do
+      let(:action) { 'issue_type' }
+    end
+
+    it { expect(subject.note).to eq "changed issue type to incident" }
+  end
 end