Add spec in Issues::MoveService to fix label assignment regression

spec/services/issues/move_service_spec.rb

@@ -23,14 +23,15 @@ describe Issues::MoveService, services: true do
       old_project.team << [user, :reporter]
       new_project.team << [user, :reporter]
 
-      ['label1', 'label2'].each do |label|
+      labels = 2.times.map { |x| "label%d" % (x + 1) }
+
+      labels.each do |label|
         old_issue.labels << create(:label,
           project_id: old_project.id,
           title: label)
-      end
 
-      new_project.labels << create(:label, title: 'label1')
-      new_project.labels << create(:label, title: 'label2')
+        new_project.labels << create(:label, title: label)
+      end
    end
   end
 
@@ -277,5 +278,25 @@ describe Issues::MoveService, services: true do
         it { expect { move }.to raise_error(StandardError, /permissions/) }
       end
     end
+
+    context 'movable issue with no assigned labels' do
+      before do
+        old_project.team << [user, :reporter]
+        new_project.team << [user, :reporter]
+
+        labels = 2.times.map { |x| "label%d" % (x + 1) }
+
+        labels.each do |label|
+          new_project.labels << create(:label, title: label)
+        end
+      end
+
+      include_context 'issue move executed'
+
+      it 'does not assign labels to new issue' do
+        expected_label_titles = new_issue.reload.labels.map(&:title)
+        expect(expected_label_titles.size).to eq 0
+      end
+    end
   end
 end