CoverageReportsController spec optimization

ee/spec/controllers/groups/analytics/coverage_reports_controller_spec.rb

@@ -3,15 +3,15 @@
 require 'spec_helper'
 
 RSpec.describe Groups::Analytics::CoverageReportsController do
-  let(:user)  { create(:user) }
-  let(:group) { create(:group) }
-  let(:project) { create(:project, namespace: group) }
-  let(:ref_path) { 'refs/heads/master' }
+  let_it_be(:user)  { create(:user) }
+  let_it_be(:group) { create(:group) }
+  let_it_be(:project) { create(:project, namespace: group) }
+  let_it_be(:ref_path) { 'refs/heads/master' }
 
-  let!(:first_coverage) { create_daily_coverage('rspec', project, 79.0, '2020-03-09') }
-  let!(:last_coverage)  { create_daily_coverage('karma', project, 95.0, '2020-03-10') }
+  let_it_be(:first_coverage) { create_daily_coverage('rspec', project, 79.0, '2020-03-09') }
+  let_it_be(:last_coverage) { create_daily_coverage('karma', project, 95.0, '2020-03-10') }
 
-  let(:valid_request_params) do
+  let_it_be(:valid_request_params) do
     {
       group_id: group.name,
       start_date: '2020-03-01',
@@ -21,11 +21,11 @@ RSpec.describe Groups::Analytics::CoverageReportsController do
     }
   end
 
-  context 'without permissions' do
   before do
     sign_in(user)
   end
 
+  context 'without permissions' do
     describe 'GET index' do
       it 'responds 403' do
         get :index, params: valid_request_params
@@ -38,7 +38,6 @@ RSpec.describe Groups::Analytics::CoverageReportsController do
   context 'with permissions' do
     before do
       group.add_owner(user)
-      sign_in(user)
     end
 
     context 'without a license' do