Refactor daily coverage specs

spec/services/ci/daily_build_group_report_result_service_spec.rb

@@ -3,17 +3,13 @@
 require 'spec_helper'
 
 RSpec.describe Ci::DailyBuildGroupReportResultService, '#execute' do
-  let!(:pipeline) { create(:ci_pipeline, created_at: '2020-02-06 00:01:10') }
-  let!(:rspec_job) { create(:ci_build, pipeline: pipeline, name: '3/3 rspec', coverage: 80) }
-  let!(:karma_job) { create(:ci_build, pipeline: pipeline, name: '2/2 karma', coverage: 90) }
-  let!(:extra_job) { create(:ci_build, pipeline: pipeline, name: 'extra', coverage: nil) }
-  let!(:group) { create(:group, :private) }
+  let_it_be(:group) { create(:group, :private) }
+  let_it_be(:pipeline) { create(:ci_pipeline, project: create(:project, group: group), created_at: '2020-02-06 00:01:10') }
+  let_it_be(:rspec_job) { create(:ci_build, pipeline: pipeline, name: '3/3 rspec', coverage: 80) }
+  let_it_be(:karma_job) { create(:ci_build, pipeline: pipeline, name: '2/2 karma', coverage: 90) }
+  let_it_be(:extra_job) { create(:ci_build, pipeline: pipeline, name: 'extra', coverage: nil) }
   let(:coverages) { Ci::DailyBuildGroupReportResult.all }
 
-  before do
-    pipeline.project.group = group
-  end
-
   it 'creates daily code coverage record for each job in the pipeline that has coverage value' do
     described_class.new.execute(pipeline)
 
@@ -25,7 +21,7 @@ RSpec.describe Ci::DailyBuildGroupReportResultService, '#execute' do
         group_name: rspec_job.group_name,
         data: { 'coverage' => rspec_job.coverage },
         date: pipeline.created_at.to_date,
-        group_id: pipeline.project.group.id
+        group_id: group.id
       )
     end
 
@@ -37,7 +33,7 @@ RSpec.describe Ci::DailyBuildGroupReportResultService, '#execute' do
         group_name: karma_job.group_name,
         data: { 'coverage' => karma_job.coverage },
         date: pipeline.created_at.to_date,
-        group_id: pipeline.project.group.id
+        group_id: group.id
       )
     end
 
@@ -162,10 +158,6 @@ RSpec.describe Ci::DailyBuildGroupReportResultService, '#execute' do
 
     let!(:some_job) { create(:ci_build, pipeline: new_pipeline, name: 'foo') }
 
-    before do
-      new_pipeline.project.group = group
-    end
-
     it 'does nothing' do
       expect { described_class.new.execute(new_pipeline) }.not_to raise_error
     end