1 files changed, 80 insertions, 0 deletions
diff --git a/spec/controllers/projects/ci/daily_build_group_report_results_controller_spec.rb b/spec/controllers/projects/ci/daily_build_group_report_results_controller_spec.rb
new file mode 100644
index 00000000000..ac31045678f
--- /dev/null
+++ b/spec/controllers/projects/ci/daily_build_group_report_results_controller_spec.rb
@@ -0,0 +1,80 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe Projects::Ci::DailyBuildGroupReportResultsController do
+  describe 'GET index' do
+    let(:project) { create(:project, :public, :repository) }
+    let(:ref_path) { 'refs/heads/master' }
+    let(:param_type) { 'coverage' }
+    let(:start_date) { '2019-12-10' }
+    let(:end_date) { '2020-03-09' }
+
+    def create_daily_coverage(group_name, coverage, date)
+      create(
+        :ci_daily_build_group_report_result,
+        project: project,
+        ref_path: ref_path,
+        group_name: group_name,
+        data: { 'coverage' => coverage },
+        date: date
+      )
+    end
+
+    def csv_response
+      CSV.parse(response.body)
+    end
+
+    before do
+      create_daily_coverage('rspec', 79.0, '2020-03-09')
+      create_daily_coverage('karma', 81.0, '2019-12-10')
+      create_daily_coverage('rspec', 67.0, '2019-12-09')
+      create_daily_coverage('karma', 71.0, '2019-12-09')
+
+      get :index, params: {
+        namespace_id: project.namespace,
+        project_id: project,
+        ref_path: ref_path,
+        param_type: param_type,
+        start_date: start_date,
+        end_date: end_date,
+        format: :csv
+      }
+    end
+
+    it 'serves the results in CSV' do
+      expect(response).to have_gitlab_http_status(:ok)
+      expect(response.headers['Content-Type']).to eq('text/csv; charset=utf-8')
+
+      expect(csv_response).to eq([
+        %w[date group_name coverage],
+        ['2020-03-09', 'rspec', '79.0'],
+        ['2019-12-10', 'karma', '81.0']
+      ])
+    end
+
+    context 'when given date range spans more than 90 days' do
+      let(:start_date) { '2019-12-09' }
+      let(:end_date) { '2020-03-09' }
+
+      it 'limits the result to 90 days from the given start_date' do
+        expect(response).to have_gitlab_http_status(:ok)
+        expect(response.headers['Content-Type']).to eq('text/csv; charset=utf-8')
+
+        expect(csv_response).to eq([
+          %w[date group_name coverage],
+          ['2020-03-09', 'rspec', '79.0'],
+          ['2019-12-10', 'karma', '81.0']
+        ])
+      end
+    end
+
+    context 'when given param_type is invalid' do
+      let(:param_type) { 'something_else' }
+
+      it 'responds with 422 error' do
+        expect(response).to have_gitlab_http_status(:unprocessable_entity)
+      end
+    end
+  end
+end