Round average coverage to 2 decimal places

ee/app/models/ee/ci/daily_build_group_report_result.rb

@@ -23,7 +23,7 @@ module EE
         def self.summaries_per_project
           group(:project_id, 'latest_by_project.date').pluck(
             :project_id,
-            Arel.sql("AVG(cast(data ->> 'coverage' AS FLOAT))"),
+            Arel.sql("ROUND(AVG(CAST(data ->> 'coverage' AS DECIMAL)), 2)::FLOAT"),
             Arel.sql("COUNT(*)"),
             Arel.sql("latest_by_project.date")
           ).each_with_object({}) do |(project_id, average_coverage, coverage_count, date), result|
@@ -37,7 +37,7 @@ module EE
 
         def self.activity_per_group
           group(:date).pluck(
-            Arel.sql("AVG(cast(data ->> 'coverage' AS FLOAT))"),
+            Arel.sql("ROUND(AVG(CAST(data ->> 'coverage' AS DECIMAL)), 2)::FLOAT"),
             Arel.sql("COUNT(*)"),
             Arel.sql("COUNT(DISTINCT ci_daily_build_group_report_results.project_id)"),
             Arel.sql("date")

ee/spec/models/ci/daily_build_group_report_result_spec.rb

@@ -48,6 +48,16 @@ RSpec.describe Ci::DailyBuildGroupReportResult do
           expect(summary).to eq(expected_summary)
         end
 
+        context 'when coverage has more than 3 decimals' do
+          let!(:build_group_report_result_3) do
+            create(:ci_daily_build_group_report_result, project: project_2, group_name: 'karma', coverage: 55.55555)
+          end
+
+          it 'returns average_coverage with 2 decimals' do
+            expect(summary[project_2.id][:average_coverage]).to eq(66.78)
+          end
+        end
+
         it 'executes only 1 SQL query' do
           query_count = ActiveRecord::QueryRecorder.new { subject }.count
 
@@ -101,7 +111,17 @@ RSpec.describe Ci::DailyBuildGroupReportResult do
             project_count: 2
           )
 
-          expect(subject).to contain_exactly(expected_results)
+          expect(activity).to contain_exactly(expected_results)
+        end
+
+        context 'when coverage has more than 3 decimals' do
+          let!(:coverage_3) do
+            create(:ci_daily_build_group_report_result, project: project_2, group_name: 'cobertura', coverage: 55.55555)
+          end
+
+          it 'returns average_coverage with 2 decimals' do
+            expect(activity.first[:average_coverage]).to eq(69.85)
+          end
         end
       end