1 files changed, 185 insertions, 0 deletions
diff --git a/spec/scripts/pipeline_test_report_builder_spec.rb b/spec/scripts/pipeline_test_report_builder_spec.rb
new file mode 100644
index 00000000000..8553ada044e
--- /dev/null
+++ b/spec/scripts/pipeline_test_report_builder_spec.rb
@@ -0,0 +1,185 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+require_relative '../../scripts/pipeline_test_report_builder'
+
+RSpec.describe PipelineTestReportBuilder do
+  let(:report_file) { 'spec/fixtures/scripts/test_report.json' }
+  let(:output_file_path) { 'tmp/previous_test_results/output_file.json' }
+
+  subject do
+    described_class.new(
+      target_project: 'gitlab-org/gitlab',
+      mr_id: '999',
+      instance_base_url: 'https://gitlab.com',
+      output_file_path: output_file_path
+    )
+  end
+
+  let(:failed_pipeline_url) { 'pipeline2_url' }
+
+  let(:failed_pipeline) do
+    {
+      'status' => 'failed',
+      'created_at' => (DateTime.now - 5).to_s,
+      'web_url' => failed_pipeline_url
+    }
+  end
+
+  let(:current_pipeline) do
+    {
+      'status' => 'running',
+      'created_at' => DateTime.now.to_s,
+      'web_url' => 'pipeline1_url'
+    }
+  end
+
+  let(:mr_pipelines) { [current_pipeline, failed_pipeline] }
+
+  let(:failed_build_id) { 9999 }
+
+  let(:failed_builds_for_pipeline) do
+    [
+      {
+        'id' => failed_build_id,
+        'stage' => 'test'
+      }
+    ]
+  end
+
+  let(:test_report_for_build) do
+    {
+      "name": "rspec-ee system pg11 geo",
+      "failed_count": 41,
+      "test_cases": [
+        {
+          "status": "failed",
+          "name": "example",
+          "classname": "ee.spec.features.geo_node_spec",
+          "file": "./ee/spec/features/geo_node_spec.rb",
+          "execution_time": 6.324748,
+          "system_output": {
+            "__content__": "\n",
+            "message": "RSpec::Core::MultipleExceptionError",
+            "type": "RSpec::Core::MultipleExceptionError"
+          }
+        }
+      ]
+    }
+  end
+
+  before do
+    allow(subject).to receive(:pipelines_for_mr).and_return(mr_pipelines)
+    allow(subject).to receive(:failed_builds_for_pipeline).and_return(failed_builds_for_pipeline)
+  end
+
+  describe '#previous_pipeline' do
+    let(:fork_pipeline_url) { 'fork_pipeline_url' }
+    let(:fork_pipeline) do
+      {
+        'status' => 'failed',
+        'created_at' => (DateTime.now - 5).to_s,
+        'web_url' => fork_pipeline_url
+      }
+    end
+
+    before do
+      allow(subject).to receive(:test_report_for_build).and_return(test_report_for_build)
+    end
+
+    context 'pipeline in a fork project' do
+      let(:mr_pipelines) { [current_pipeline, fork_pipeline] }
+
+      it 'returns fork pipeline' do
+        expect(subject.previous_pipeline).to eq(fork_pipeline)
+      end
+    end
+
+    context 'pipeline in target project' do
+      it 'returns failed pipeline' do
+        expect(subject.previous_pipeline).to eq(failed_pipeline)
+      end
+    end
+  end
+
+  describe '#test_report_for_latest_pipeline' do
+    it 'fetches builds from pipeline related to MR' do
+      expect(subject).to receive(:fetch).with("#{failed_pipeline_url}/tests/suite.json?build_ids[]=#{failed_build_id}").and_return(failed_builds_for_pipeline)
+      subject.test_report_for_latest_pipeline
+    end
+
+    context 'canonical pipeline' do
+      before do
+        allow(subject).to receive(:test_report_for_build).and_return(test_report_for_build)
+      end
+
+      context 'no previous pipeline' do
+        let(:mr_pipelines) { [] }
+
+        it 'returns empty hash' do
+          expect(subject.test_report_for_latest_pipeline).to eq("{}")
+        end
+      end
+
+      context 'first pipeline scenario' do
+        let(:mr_pipelines) do
+          [
+            {
+              'status' => 'running',
+              'created_at' => DateTime.now.to_s
+            }
+          ]
+        end
+
+        it 'returns empty hash' do
+          expect(subject.test_report_for_latest_pipeline).to eq("{}")
+        end
+      end
+
+      context 'no previous failed pipeline' do
+        let(:mr_pipelines) do
+          [
+            {
+              'status' => 'running',
+              'created_at' => DateTime.now.to_s
+            },
+            {
+              'status' => 'success',
+              'created_at' => (DateTime.now - 5).to_s
+            }
+          ]
+        end
+
+        it 'returns empty hash' do
+          expect(subject.test_report_for_latest_pipeline).to eq("{}")
+        end
+      end
+
+      context 'no failed test builds' do
+        let(:failed_builds_for_pipeline) do
+          [
+            {
+              'id' => 9999,
+              'stage' => 'prepare'
+            }
+          ]
+        end
+
+        it 'returns empty hash' do
+          expect(subject.test_report_for_latest_pipeline).to eq("{}")
+        end
+      end
+
+      context 'failed pipeline and failed test builds' do
+        it 'returns populated test list for suites' do
+          actual = subject.test_report_for_latest_pipeline
+          expected = {
+            'suites' => [test_report_for_build]
+          }.to_json
+
+          expect(actual).to eq(expected)
+        end
+      end
+    end
+  end
+end