Add test examples for system notes

- Tree reorder service should create system
notes when new parent is set

ee/spec/requests/api/graphql/mutations/epic_tree/reorder_spec.rb

@@ -49,7 +49,7 @@ RSpec.describe 'Updating an epic tree' do
     end
   end
 
-  context 'when epic feature is enabled' do
+  context 'when epics and subepics features are enabled' do
     before do
       stub_licensed_features(epics: true, subepics: true)
     end

ee/spec/services/epics/tree_reorder_service_spec.rb

@@ -66,7 +66,7 @@ RSpec.describe Epics::TreeReorderService do
 
       context 'when user does have permission to admin the base epic' do
         before do
-          group.add_developer(user)
+          group.add_reporter(user)
         end
 
         context 'when relative_position is not valid' do
@@ -102,6 +102,10 @@ RSpec.describe Epics::TreeReorderService do
             it 'updates the parent' do
               expect { subject }.to change { tree_object_2.reload.epic }.from(epic1).to(epic)
             end
+
+            it 'creates system notes' do
+              expect { subject }.to change { Note.system.count }.by(3)
+            end
           end
 
           context 'when object being moved is from another epic' do
@@ -207,6 +211,10 @@ RSpec.describe Epics::TreeReorderService do
 
                 expect(tree_object_1.reload.relative_position).to be > tree_object_2.reload.relative_position
               end
+
+              it 'creates system notes' do
+                expect { subject }.to change { Note.system.count }.by(3)
+              end
             end
           end
         end
@@ -215,6 +223,17 @@ RSpec.describe Epics::TreeReorderService do
           let!(:tree_object_1) { epic1 }
           let!(:tree_object_2) { epic2 }
 
+          context 'when subepics feature is disabled' do
+            let(:new_parent_id) { GitlabSchema.id_from_object(epic) }
+
+            before do
+              stub_licensed_features(epics: true, subepics: false)
+            end
+
+            it_behaves_like 'error for the tree update', 'You don\'t have permissions to move the objects.'
+          end
+
+          context 'when subepics feature is enabled' do
             before do
               stub_licensed_features(epics: true, subepics: true)
             end
@@ -231,6 +250,16 @@ RSpec.describe Epics::TreeReorderService do
               it_behaves_like 'error for the tree update', 'You don\'t have permissions to move the objects.'
             end
 
+            context 'when user does not have permissions to admin the previous parent links' do
+              let(:new_parent_id) { GitlabSchema.id_from_object(epic) }
+
+              before do
+                group.add_guest(user)
+              end
+
+              it_behaves_like 'error for the tree update', 'You don\'t have permissions to move the objects.'
+            end
+
             context 'when there is some other error with the new parent' do
               let(:other_group) { create(:group) }
               let(:new_parent_id) { GitlabSchema.id_from_object(epic) }
@@ -252,6 +281,8 @@ RSpec.describe Epics::TreeReorderService do
               it_behaves_like 'error for the tree update', 'You don\'t have permissions to move the objects.'
             end
 
+            context 'when user '
+
             context 'when the reordered epics are not subepics of the base epic' do
               let(:another_group) { create(:group) }
               let(:another_epic) { create(:epic, group: another_group) }
@@ -264,19 +295,6 @@ RSpec.describe Epics::TreeReorderService do
               it_behaves_like 'error for the tree update', 'You don\'t have permissions to move the objects.'
             end
 
-          context 'when new parent is another epic and subepics feature is disabled' do
-            let(:other_epic) { create(:epic, group: group) }
-            let(:new_parent_id) { GitlabSchema.id_from_object(epic) }
-            let(:epic3) { create(:epic, parent: other_epic, group: group) }
-            let(:tree_object_2) { epic3 }
-
-            before do
-              stub_licensed_features(epics: true, subepics: false)
-            end
-
-            it_behaves_like 'error for the tree update', 'You don\'t have permissions to move the objects.'
-          end
-
             context 'when moving is successful' do
               it 'updates the links relative positions' do
                 subject
@@ -304,7 +322,7 @@ RSpec.describe Epics::TreeReorderService do
                 let(:epic3) { create(:epic, parent: other_epic, group: group) }
                 let(:tree_object_2) { epic3 }
 
-              it 'updates the relative positions and parent_id' do
+                it 'updates the relative positions' do
                   subject
 
                   expect(tree_object_1.reload.relative_position).to be > tree_object_2.reload.relative_position
@@ -313,6 +331,11 @@ RSpec.describe Epics::TreeReorderService do
                 it 'updates the parent' do
                   expect { subject }.to change { tree_object_2.reload.parent }.from(other_epic).to(epic)
                 end
+
+                it 'creates system notes' do
+                  expect { subject }.to change { Note.system.count }.by(2)
+                end
+              end
             end
           end
         end