Move Browser-Performance-Testing template to rules

Part of https://gitlab.com/gitlab-org/gitlab/-/issues/213336

changelogs/unreleased/move-browser-performance-testing-to-rules-syntax.yml

+---
+title: Move Browser-Perfomance-Testing.gitlab-ci.yml to `rules` syntax
+merge_request: 31413
+author:
+type: changed

lib/gitlab/ci/templates/Jobs/Browser-Performance-Testing.gitlab-ci.yml

@@ -30,11 +30,9 @@ performance:
     paths:
       - performance.json
       - sitespeed-results/
-  only:
-    refs:
-      - branches
-      - tags
-    kubernetes: active
-  except:
-    variables:
-      - $PERFORMANCE_DISABLED
+  rules:
+    - if: '$CI_KUBERNETES_ACTIVE == null || $CI_KUBERNETES_ACTIVE == ""'
+      when: never
+    - if: '$PERFORMANCE_DISABLED'
+      when: never
+    - if: '$CI_COMMIT_TAG || $CI_COMMIT_BRANCH'

spec/lib/gitlab/ci/templates/Jobs/browser_performance_testing_gitlab_ci_yaml_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe 'Jobs/Browser-Performance-Testing.gitlab-ci.yml' do
+  subject(:template) do
+    <<~YAML
+      stages:
+        - test
+        - performance
+
+      include:
+        - template: 'Jobs/Browser-Performance-Testing.gitlab-ci.yml'
+
+      placeholder:
+        script:
+          - keep pipeline validator happy by having a job when stages are intentionally empty
+    YAML
+  end
+
+  describe 'the created pipeline' do
+    let(:user) { create(:admin) }
+    let(:project) do
+      create(:project, :repository, variables: [
+        build(:ci_variable, key: 'CI_KUBERNETES_ACTIVE', value: 'true')
+      ])
+    end
+
+    let(:default_branch) { 'master' }
+    let(:pipeline_ref) { default_branch }
+    let(:service) { Ci::CreatePipelineService.new(project, user, ref: pipeline_ref) }
+    let(:pipeline) { service.execute!(:push) }
+    let(:build_names) { pipeline.builds.pluck(:name) }
+
+    before do
+      stub_ci_pipeline_yaml_file(template)
+
+      allow_any_instance_of(Ci::BuildScheduleWorker).to receive(:perform).and_return(true)
+      allow(project).to receive(:default_branch).and_return(default_branch)
+    end
+
+    it 'has no errors' do
+      expect(pipeline.errors).to be_empty
+    end
+
+    shared_examples_for 'performance job on tag or branch' do
+      it 'by default' do
+        expect(build_names).to include('performance')
+      end
+
+      it 'when PERFORMANCE_DISABLED' do
+        create(:ci_variable, project: project, key: 'PERFORMANCE_DISABLED', value: '1')
+
+        expect(build_names).not_to include('performance')
+      end
+    end
+
+    context 'on master' do
+      it_behaves_like 'performance job on tag or branch'
+    end
+
+    context 'on another branch' do
+      let(:pipeline_ref) { 'feature' }
+
+      it_behaves_like 'performance job on tag or branch'
+    end
+
+    context 'on tag' do
+      let(:pipeline_ref) { 'v1.0.0' }
+
+      it_behaves_like 'performance job on tag or branch'
+    end
+
+    context 'on merge request' do
+      let(:service) { MergeRequests::CreatePipelineService.new(project, user) }
+      let(:merge_request) { create(:merge_request, :simple, source_project: project) }
+      let(:pipeline) { service.execute(merge_request) }
+
+      it 'has no jobs' do
+        expect(pipeline).to be_merge_request_event
+        expect(build_names).to be_empty
+      end
+    end
+  end
+end