Merge branch 'fix-median-counting-for-cycle-analytics' into 'master'

Add additional condition to count median properly

See merge request gitlab-org/gitlab-ce!30229

changelogs/unreleased/fix-median-counting-for-cycle-analytics.yml

+---
+title: Fix median counting for cycle analytics
+merge_request: 30229
+author:
+type: fixed

lib/gitlab/database/median.rb

@@ -158,7 +158,7 @@ module Gitlab
               Arel::Nodes::Window.new.order(arel_table[column_sym])
             ).as('row_id')
 
-          count = arel_table.project("COUNT(1)").as('ct')
+          count = arel_table.where(arel_table[column_sym].gteq(zero_interval)).project("COUNT(1)").as('ct')
 
           [column_row, row_id, count]
         end

spec/lib/gitlab/cycle_analytics/test_stage_spec.rb

@@ -3,6 +3,40 @@ require 'lib/gitlab/cycle_analytics/shared_stage_spec'
 
 describe Gitlab::CycleAnalytics::TestStage do
   let(:stage_name) { :test }
+  let(:project) { create(:project) }
+  let(:stage) { described_class.new(project: project, options: { from: 2.days.ago, current_user: project.creator }) }
 
   it_behaves_like 'base stage'
+
+  describe '#median' do
+    before do
+      issue_1 = create(:issue, project: project, created_at: 90.minutes.ago)
+      issue_2 = create(:issue, project: project, created_at: 60.minutes.ago)
+      issue_3 = create(:issue, project: project, created_at: 60.minutes.ago)
+      mr_1 = create(:merge_request, :closed, source_project: project, created_at: 60.minutes.ago)
+      mr_2 = create(:merge_request, :closed, source_project: project, created_at: 40.minutes.ago, source_branch: 'A')
+      mr_3 = create(:merge_request, source_project: project, created_at: 10.minutes.ago, source_branch: 'B')
+      mr_4 = create(:merge_request, source_project: project, created_at: 10.minutes.ago, source_branch: 'C')
+      mr_5 = create(:merge_request, source_project: project, created_at: 10.minutes.ago, source_branch: 'D')
+      mr_1.metrics.update!(latest_build_started_at: 32.minutes.ago, latest_build_finished_at: 2.minutes.ago)
+      mr_2.metrics.update!(latest_build_started_at: 62.minutes.ago, latest_build_finished_at: 32.minutes.ago)
+      mr_3.metrics.update!(latest_build_started_at: nil, latest_build_finished_at: nil)
+      mr_4.metrics.update!(latest_build_started_at: nil, latest_build_finished_at: nil)
+      mr_5.metrics.update!(latest_build_started_at: nil, latest_build_finished_at: nil)
+
+      create(:merge_requests_closing_issues, merge_request: mr_1, issue: issue_1)
+      create(:merge_requests_closing_issues, merge_request: mr_2, issue: issue_2)
+      create(:merge_requests_closing_issues, merge_request: mr_3, issue: issue_3)
+      create(:merge_requests_closing_issues, merge_request: mr_4, issue: issue_3)
+      create(:merge_requests_closing_issues, merge_request: mr_5, issue: issue_3)
+    end
+
+    around do |example|
+      Timecop.freeze { example.run }
+    end
+
+    it 'counts median from issues with metrics' do
+      expect(stage.median).to eq(ISSUES_MEDIAN)
+    end
+  end
 end