Add specs for create from default integration

spec/models/service_spec.rb

@@ -501,6 +501,104 @@ RSpec.describe Service do
     end
   end
 
+  describe '.create_from_active_default_integrations' do
+    context 'with an active service template' do
+      let_it_be(:template_integration) { create(:prometheus_service, :template, api_url: 'https://prometheus.template.com/') }
+
+      it 'creates a service from the template' do
+        described_class.create_from_active_default_integrations(project, :project_id, with_templates: true)
+
+        expect(project.reload.services.size).to eq(1)
+        expect(project.reload.services.first.api_url).to eq(template_integration.api_url)
+        expect(project.reload.services.first.inherit_from_id).to be_nil
+      end
+
+      context 'with an active instance-level integration' do
+        let!(:instance_integration) { create(:prometheus_service, :instance, api_url: 'https://prometheus.instance.com/') }
+
+        it 'creates a service from the instance-level integration' do
+          described_class.create_from_active_default_integrations(project, :project_id, with_templates: true)
+
+          expect(project.reload.services.size).to eq(1)
+          expect(project.reload.services.first.api_url).to eq(instance_integration.api_url)
+          expect(project.reload.services.first.inherit_from_id).to eq(instance_integration.id)
+        end
+
+        context 'passing a group' do
+          it 'creates a service from the instance-level integration' do
+            described_class.create_from_active_default_integrations(group, :group_id)
+
+            expect(group.reload.services.size).to eq(1)
+            expect(group.reload.services.first.api_url).to eq(instance_integration.api_url)
+            expect(group.reload.services.first.inherit_from_id).to eq(instance_integration.id)
+          end
+        end
+
+        context 'with an active group-level integration' do
+          let!(:group_integration) { create(:prometheus_service, group: group, project: nil, api_url: 'https://prometheus.group.com/') }
+
+          it 'creates a service from the group-level integration' do
+            described_class.create_from_active_default_integrations(project, :project_id, with_templates: true)
+
+            expect(project.reload.services.size).to eq(1)
+            expect(project.reload.services.first.api_url).to eq(group_integration.api_url)
+            expect(project.reload.services.first.inherit_from_id).to eq(group_integration.id)
+          end
+
+          context 'passing a group' do
+            let!(:subgroup) { create(:group, parent: group) }
+
+            it 'creates a service from the group-level integration' do
+              described_class.create_from_active_default_integrations(subgroup, :group_id)
+
+              expect(subgroup.reload.services.size).to eq(1)
+              expect(subgroup.reload.services.first.api_url).to eq(group_integration.api_url)
+              expect(subgroup.reload.services.first.inherit_from_id).to eq(group_integration.id)
+            end
+          end
+
+          context 'with an active subgroup' do
+            let!(:subgroup_integration) { create(:prometheus_service, group: subgroup, project: nil, api_url: 'https://prometheus.subgroup.com/') }
+            let!(:subgroup) { create(:group, parent: group) }
+            let(:project) { create(:project, group: subgroup) }
+
+            it 'creates a service from the subgroup-level integration' do
+              described_class.create_from_active_default_integrations(project, :project_id, with_templates: true)
+
+              expect(project.reload.services.size).to eq(1)
+              expect(project.reload.services.first.api_url).to eq(subgroup_integration.api_url)
+              expect(project.reload.services.first.inherit_from_id).to eq(subgroup_integration.id)
+            end
+
+            context 'passing a group' do
+              let!(:sub_subgroup) { create(:group, parent: subgroup) }
+
+              it 'creates a service from the subgroup-level integration' do
+                described_class.create_from_active_default_integrations(sub_subgroup, :group_id)
+
+                expect(sub_subgroup.reload.services.size).to eq(1)
+                expect(sub_subgroup.reload.services.first.api_url).to eq(subgroup_integration.api_url)
+                expect(sub_subgroup.reload.services.first.inherit_from_id).to eq(subgroup_integration.id)
+              end
+
+              context 'having a service inheriting settings' do
+                let!(:subgroup_integration) { create(:prometheus_service, group: subgroup, project: nil, inherit_from_id: group_integration.id, api_url: 'https://prometheus.subgroup.com/') }
+
+                it 'creates a service from the group-level integration' do
+                  described_class.create_from_active_default_integrations(sub_subgroup, :group_id)
+
+                  expect(sub_subgroup.reload.services.size).to eq(1)
+                  expect(sub_subgroup.reload.services.first.api_url).to eq(group_integration.api_url)
+                  expect(sub_subgroup.reload.services.first.inherit_from_id).to eq(group_integration.id)
+                end
+              end
+            end
+          end
+        end
+      end
+    end
+  end
+
   describe "{property}_changed?" do
     let(:service) do
       BambooService.create(