Add AccessibilityReportsComparer API

app/serializers/accessibility_error_entity.rb

+# frozen_string_literal: true
+
+class AccessibilityErrorEntity < Grape::Entity
+  expose :code
+  expose :type
+  expose :typeCode, as: :type_code
+  expose :message
+  expose :context
+  expose :selector
+  expose :runner
+  expose :runnerExtras, as: :runner_extras
+end

app/serializers/accessibility_reports_comparer_entity.rb

+# frozen_string_literal: true
+
+class AccessibilityReportsComparerEntity < Grape::Entity
+  expose :status
+
+  expose :new_errors, using: AccessibilityErrorEntity
+  expose :resolved_errors, using: AccessibilityErrorEntity
+  expose :existing_errors, using: AccessibilityErrorEntity
+
+  expose :summary do
+    expose :total_count, as: :total
+    expose :resolved_count, as: :resolved
+    expose :errors_count, as: :errored
+  end
+end

app/serializers/accessibility_reports_comparer_serializer.rb

+# frozen_string_literal: true
+
+class AccessibilityReportsComparerSerializer < BaseSerializer
+  entity AccessibilityReportsComparerEntity
+end

lib/gitlab/ci/parsers/accessibility/pa11y.rb

@@ -6,7 +6,7 @@ module Gitlab
       module Accessibility
         class Pa11y
           def parse!(json_data, accessibility_report)
-            root = Gitlab::Json.parse(json_data)
+            root = Gitlab::Json.parse(json_data).with_indifferent_access
 
             parse_all(root, accessibility_report)
           rescue JSON::ParserError => e

spec/fixtures/api/schemas/entities/accessibility_error.json

+{
+  "type": "object",
+  "required": [
+    "code",
+    "type",
+    "type_code",
+    "message",
+    "context",
+    "selector",
+    "runner",
+    "runner_extras"
+  ],
+  "properties": {
+    "code": {
+      "type": "string"
+    },
+    "type": {
+      "type": "string"
+    },
+    "type_code": {
+      "type": "integer"
+    },
+    "message": {
+      "type": "string"
+    },
+    "context": {
+      "type": "string"
+    },
+    "selector": {
+      "type": "string"
+    },
+    "runner": {
+      "type": "string"
+    },
+    "runner_extras": {
+      "type": ["object", "null"]
+    }
+  },
+  "additionalProperties": false
+}

spec/fixtures/api/schemas/entities/accessibility_reports_comparer.json

+{
+  "type": "object",
+  "required": ["status", "summary", "new_errors", "resolved_errors", "existing_errors"],
+  "properties": {
+    "status": {
+      "type": "string"
+    },
+    "summary": {
+      "type": "object",
+      "properties": {
+        "total": {
+          "type": "integer"
+        },
+        "resolved": {
+          "type": "integer"
+        },
+        "errored": {
+          "type": "integer"
+        }
+      },
+      "required": ["total", "resolved", "errored"]
+    },
+    "new_errors": {
+      "type": "array",
+      "items": {
+        "$ref": "accessibility_error.json"
+      }
+    },
+    "resolved_errors": {
+      "type": "array",
+      "items": {
+        "$ref": "accessibility_error.json"
+      }
+    },
+    "existing_errors": {
+      "type": "array",
+      "items": {
+        "$ref": "accessibility_error.json"
+      }
+    }
+  },
+  "additionalProperties": false
+}

spec/lib/gitlab/ci/parsers/accessibility/pa11y_spec.rb

@@ -88,6 +88,7 @@ describe Gitlab::Ci::Parsers::Accessibility::Pa11y do
           expect(accessibility_report.passes_count).to eq(0)
           expect(accessibility_report.scans_count).to eq(1)
           expect(accessibility_report.urls['https://about.gitlab.com/']).to be_present
+          expect(accessibility_report.urls['https://about.gitlab.com/'].first[:code]).to be_present
         end
       end
     end

spec/serializers/accessibility_error_entity_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe AccessibilityErrorEntity do
+  let(:entity) { described_class.new(accessibility_error) }
+
+  describe '#as_json' do
+    subject { entity.as_json }
+
+    context 'when accessibility contains an error' do
+      let(:accessibility_error) do
+        {
+          code: "WCAG2AA.Principle4.Guideline4_1.4_1_2.H91.A.NoContent",
+          type: "error",
+          typeCode: 1,
+          message: "Anchor element found with a valid href attribute, but no link content has been supplied.",
+          context: "<a href=\"/\" class=\"navbar-brand animated\"><svg height=\"36\" viewBox=\"0 0 1...</a>",
+          selector: "#main-nav > div:nth-child(1) > a",
+          runner: "htmlcs",
+          runnerExtras: {}
+        }
+      end
+
+      it 'contains correct accessibility error details', :aggregate_failures do
+        expect(subject[:code]).to eq("WCAG2AA.Principle4.Guideline4_1.4_1_2.H91.A.NoContent")
+        expect(subject[:type]).to eq("error")
+        expect(subject[:type_code]).to eq(1)
+        expect(subject[:message]).to eq("Anchor element found with a valid href attribute, but no link content has been supplied.")
+        expect(subject[:context]).to eq("<a href=\"/\" class=\"navbar-brand animated\"><svg height=\"36\" viewBox=\"0 0 1...</a>")
+        expect(subject[:selector]).to eq("#main-nav > div:nth-child(1) > a")
+        expect(subject[:runner]).to eq("htmlcs")
+        expect(subject[:runner_extras]).to be_empty
+      end
+    end
+  end
+end

spec/serializers/accessibility_reports_comparer_entity_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe AccessibilityReportsComparerEntity do
+  let(:entity) { described_class.new(comparer) }
+  let(:comparer) { Gitlab::Ci::Reports::AccessibilityReportsComparer.new(base_report, head_report) }
+  let(:base_report) { Gitlab::Ci::Reports::AccessibilityReports.new }
+  let(:head_report) { Gitlab::Ci::Reports::AccessibilityReports.new }
+  let(:url) { "https://gitlab.com" }
+  let(:single_error) do
+    [
+      {
+        code: "WCAG2AA.Principle4.Guideline4_1.4_1_2.H91.A.NoContent",
+        type: "error",
+        typeCode: 1,
+        message: "Anchor element found with a valid href attribute, but no link content has been supplied.",
+        context: "<a href=\"/\" class=\"navbar-brand animated\"><svg height=\"36\" viewBox=\"0 0 1...</a>",
+        selector: "#main-nav > div:nth-child(1) > a",
+        runner: "htmlcs",
+        runnerExtras: {}
+      }
+    ]
+  end
+  let(:different_error) do
+    [
+      {
+        code: "WCAG2AA.Principle1.Guideline1_4.1_4_3.G18.Fail",
+        type: "error",
+        typeCode: 1,
+        message: "This element has insufficient contrast at this conformance level.",
+        context: "<a href=\"/stages-devops-lifecycle/\" class=\"main-nav-link\">Product</a>",
+        selector: "#main-nav > div:nth-child(2) > ul > li:nth-child(1) > a",
+        runner: "htmlcs",
+        runnerExtras: {}
+      }
+    ]
+  end
+
+  describe '#as_json' do
+    subject { entity.as_json }
+
+    context 'when base report has error and head has a different error' do
+      before do
+        base_report.add_url(url, single_error)
+        head_report.add_url(url, different_error)
+      end
+
+      it 'contains correct compared accessibility report details', :aggregate_failures do
+        expect(subject[:status]).to eq(Gitlab::Ci::Reports::AccessibilityReportsComparer::STATUS_FAILED)
+        expect(subject[:resolved_errors].first).to include(:code, :type, :type_code, :message, :context, :selector, :runner, :runner_extras)
+        expect(subject[:new_errors].first).to include(:code, :type, :type_code, :message, :context, :selector, :runner, :runner_extras)
+        expect(subject[:existing_errors].first).to include(:code, :type, :type_code, :message, :context, :selector, :runner, :runner_extras)
+        expect(subject[:summary]).to include(total: 2, resolved: 1, errored: 1)
+      end
+    end
+
+    context 'when base report has error and head has the same error' do
+      before do
+        base_report.add_url(url, single_error)
+        head_report.add_url(url, single_error)
+      end
+
+      it 'contains correct compared accessibility report details', :aggregate_failures do
+        expect(subject[:status]).to eq(Gitlab::Ci::Reports::AccessibilityReportsComparer::STATUS_FAILED)
+        expect(subject[:new_errors]).to be_empty
+        expect(subject[:resolved_errors]).to be_empty
+        expect(subject[:existing_errors].first).to include(:code, :type, :type_code, :message, :context, :selector, :runner, :runner_extras)
+        expect(subject[:summary]).to include(total: 1, resolved: 0, errored: 1)
+      end
+    end
+
+    context 'when base report has no error and head has errors' do
+      before do
+        head_report.add_url(url, single_error)
+      end
+
+      it 'contains correct compared accessibility report details', :aggregate_failures do
+        expect(subject[:status]).to eq(Gitlab::Ci::Reports::AccessibilityReportsComparer::STATUS_FAILED)
+        expect(subject[:resolved_errors]).to be_empty
+        expect(subject[:existing_errors]).to be_empty
+        expect(subject[:new_errors].first).to include(:code, :type, :type_code, :message, :context, :selector, :runner, :runner_extras)
+        expect(subject[:summary]).to include(total: 1, resolved: 0, errored: 1)
+      end
+    end
+  end
+end

spec/serializers/accessibility_reports_comparer_serializer_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe AccessibilityReportsComparerSerializer do
+  let(:project) { double(:project) }
+  let(:serializer) { described_class.new(project: project).represent(comparer) }
+  let(:comparer) { Gitlab::Ci::Reports::AccessibilityReportsComparer.new(base_report, head_report) }
+  let(:base_report) { Gitlab::Ci::Reports::AccessibilityReports.new }
+  let(:head_report) { Gitlab::Ci::Reports::AccessibilityReports.new }
+  let(:url) { "https://gitlab.com" }
+  let(:single_error) do
+    [
+      {
+        code: "WCAG2AA.Principle4.Guideline4_1.4_1_2.H91.A.NoContent",
+        type: "error",
+        typeCode: 1,
+        message: "Anchor element found with a valid href attribute, but no link content has been supplied.",
+        context: "<a href=\"/\" class=\"navbar-brand animated\"><svg height=\"36\" viewBox=\"0 0 1...</a>",
+        selector: "#main-nav > divnth-child(1) > a",
+        runner: "htmlcs",
+        runnerExtras: {}
+      }
+    ]
+  end
+  let(:different_error) do
+    [
+      {
+        code: "WCAG2AA.Principle1.Guideline1_4.1_4_3.G18.Fail",
+        type: "error",
+        typeCode: 1,
+        message: "This element has insufficient contrast at this conformance level.",
+        context: "<a href=\"/stages-devops-lifecycle/\" class=\"main-nav-link\">Product</a>",
+        selector: "#main-nav > divnth-child(2) > ul > linth-child(1) > a",
+        runner: "htmlcs",
+        runnerExtras: {}
+      }
+    ]
+  end
+
+  describe '#to_json' do
+    subject { serializer.as_json }
+
+    context 'when base report has error and head has a different error' do
+      before do
+        base_report.add_url(url, single_error)
+        head_report.add_url(url, different_error)
+      end
+
+      it 'matches the schema' do
+        expect(subject).to match_schema('entities/accessibility_reports_comparer')
+      end
+    end
+
+    context 'when base report has no error and head has errors' do
+      before do
+        head_report.add_url(url, single_error)
+      end
+
+      it 'matches the schema' do
+        expect(subject).to match_schema('entities/accessibility_reports_comparer')
+      end
+    end
+  end
+end