Add AccessibilityReportsService class

app/services/ci/compare_accessibility_reports_service.rb

+# frozen_string_literal: true
+
+module Ci
+  class CompareAccessibilityReportsService < CompareReportsBaseService
+    def comparer_class
+      Gitlab::Ci::Reports::AccessibilityReportsComparer
+    end
+
+    def serializer_class
+      AccessibilityReportsComparerSerializer
+    end
+
+    def get_report(pipeline)
+      pipeline&.accessibility_reports
+    end
+  end
+end

spec/services/ci/compare_accessibility_reports_service_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe Ci::CompareAccessibilityReportsService do
+  let(:service) { described_class.new(project) }
+  let(:project) { create(:project, :repository) }
+
+  describe '#execute' do
+    subject { service.execute(base_pipeline, head_pipeline) }
+
+    context 'when head pipeline has accessibility reports' do
+      let(:base_pipeline) { nil }
+      let(:head_pipeline) { create(:ci_pipeline, :with_accessibility_reports, project: project) }
+
+      it 'returns status and data' do
+        expect(subject[:status]).to eq(:parsed)
+        expect(subject[:data]).to match_schema('entities/accessibility_reports_comparer')
+      end
+    end
+
+    context 'when base and head pipelines have accessibility reports' do
+      let(:base_pipeline) { create(:ci_pipeline, :with_accessibility_reports, project: project) }
+      let(:head_pipeline) { create(:ci_pipeline, :with_accessibility_reports, project: project) }
+
+      it 'returns status and data' do
+        expect(subject[:status]).to eq(:parsed)
+        expect(subject[:data]).to match_schema('entities/accessibility_reports_comparer')
+      end
+    end
+  end
+
+  describe '#latest?' do
+    subject { service.latest?(base_pipeline, head_pipeline, data) }
+
+    let!(:base_pipeline) { nil }
+    let!(:head_pipeline) { create(:ci_pipeline, :with_accessibility_reports, project: project) }
+    let!(:key) { service.send(:key, base_pipeline, head_pipeline) }
+
+    context 'when cache key is latest' do
+      let(:data) { { key: key } }
+
+      it { is_expected.to be_truthy }
+    end
+
+    context 'when cache key is outdated' do
+      before do
+        head_pipeline.update_column(:updated_at, 10.minutes.ago)
+      end
+
+      let(:data) { { key: key } }
+
+      it { is_expected.to be_falsy }
+    end
+
+    context 'when cache key is empty' do
+      let(:data) { { key: nil } }
+
+      it { is_expected.to be_falsy }
+    end
+  end
+end