Reduce no of queries in epic_issues service specs

- Replace the use of modifier let with let_it_be

ee/spec/services/epic_issues/create_service_spec.rb

@@ -4,14 +4,14 @@ require 'spec_helper'
 
 RSpec.describe EpicIssues::CreateService do
   describe '#execute' do
-    let(:group) { create(:group) }
-    let(:epic) { create(:epic, group: group) }
-    let(:project) { create(:project, group: group) }
-    let(:issue) { create(:issue, project: project) }
-    let(:issue2) { create(:issue, project: project) }
-    let(:issue3) { create(:issue, project: project) }
-    let(:user) { create(:user) }
-    let(:valid_reference) { issue.to_reference(full: true) }
+    let_it_be(:group) { create(:group) }
+    let_it_be(:project) { create(:project, group: group) }
+    let_it_be(:user) { create(:user) }
+    let_it_be(:issue) { create(:issue, project: project) }
+    let_it_be(:issue2) { create(:issue, project: project) }
+    let_it_be(:issue3) { create(:issue, project: project) }
+    let_it_be(:valid_reference) { issue.to_reference(full: true) }
+    let_it_be(:epic, reload: true) { create(:epic, group: group) }
 
     def assign_issue(references)
       params = { issuable_references: references }
@@ -159,9 +159,9 @@ RSpec.describe EpicIssues::CreateService do
           end
 
           context 'when a link of an issue in a subgroup is given' do
-            let(:subgroup) { create(:group, parent: group) }
-            let(:project2) { create(:project, group: subgroup) }
-            let(:issue) { create(:issue, project: project2) }
+            let_it_be(:subgroup) { create(:group, parent: group) }
+            let_it_be(:project2) { create(:project, group: subgroup) }
+            let_it_be(:issue) { create(:issue, project: project2) }
 
             subject { assign_issue([Gitlab::Routing.url_helpers.namespace_project_issue_url(namespace_id: issue.project.namespace, project_id: issue.project, id: issue.iid)])}
 
@@ -201,10 +201,10 @@ RSpec.describe EpicIssues::CreateService do
         end
 
         context 'when there are invalid references' do
-          let(:epic) { create(:epic, confidential: true, group: group) }
-          let(:valid_issue) { create(:issue, :confidential, project: project) }
-          let(:invalid_issue1) { create(:issue, project: project) }
-          let(:invalid_issue2) { create(:issue, project: project) }
+          let_it_be(:epic) { create(:epic, confidential: true, group: group) }
+          let_it_be(:valid_issue) { create(:issue, :confidential, project: project) }
+          let_it_be(:invalid_issue1) { create(:issue, project: project) }
+          let_it_be(:invalid_issue2) { create(:issue, project: project) }
 
           subject do
             assign_issue([invalid_issue1.to_reference(full: true),
@@ -255,7 +255,7 @@ RSpec.describe EpicIssues::CreateService do
         end
 
         context 'when at least one of the issues is still not assigned to the epic' do
-          let(:valid_reference) { issue2.to_reference(full: true) }
+          let_it_be(:valid_reference) { issue2.to_reference(full: true) }
 
           subject { assign_issue([valid_reference, issue.to_reference(full: true)]) }
 
@@ -270,7 +270,7 @@ RSpec.describe EpicIssues::CreateService do
           issue.reload
         end
 
-        let(:another_epic) { create(:epic, group: group) }
+        let_it_be(:another_epic) { create(:epic, group: group) }
 
         subject do
           params = { issuable_references: [valid_reference] }
@@ -335,7 +335,7 @@ RSpec.describe EpicIssues::CreateService do
       context 'when issue from non group project is given' do
         subject { assign_issue([another_issue.to_reference(full: true)]) }
 
-        let(:another_issue) { create :issue }
+        let_it_be(:another_issue) { create :issue }
 
         before do
           group.add_developer(user)

ee/spec/services/epic_issues/destroy_service_spec.rb

@@ -4,12 +4,12 @@ require 'spec_helper'
 
 RSpec.describe EpicIssues::DestroyService do
   describe '#execute' do
-    let(:user) { create(:user) }
-    let(:group) { create(:group, :public) }
-    let(:project) { create(:project, group: group) }
-    let(:epic) { create(:epic, group: group) }
-    let(:issue) { create(:issue, project: project) }
-    let!(:epic_issue) { create(:epic_issue, epic: epic, issue: issue) }
+    let_it_be(:user) { create(:user) }
+    let_it_be(:group, refind: true) { create(:group, :public) }
+    let_it_be(:project, refind: true) { create(:project, group: group) }
+    let_it_be(:epic, reload: true) { create(:epic, group: group) }
+    let_it_be(:issue, reload: true) { create(:issue, project: project) }
+    let_it_be(:epic_issue, reload: true) { create(:epic_issue, epic: epic, issue: issue) }
 
     subject { described_class.new(epic_issue, user).execute }
 

ee/spec/services/epic_issues/list_service_spec.rb

@@ -3,22 +3,22 @@
 require 'spec_helper'
 
 RSpec.describe EpicIssues::ListService do
-  let(:user) { create :user }
-  let(:group) { create(:group, :private) }
-  let(:project) { create(:project_empty_repo, group: group) }
-  let(:other_project) { create(:project_empty_repo, group: group) }
-  let(:epic) { create(:epic, group: group) }
+  let_it_be(:user) { create :user }
+  let_it_be(:group, refind: true) { create(:group, :private) }
+  let_it_be(:project, refind: true) { create(:project_empty_repo, group: group) }
+  let_it_be(:other_project) { create(:project_empty_repo, group: group) }
+  let_it_be(:epic, refind: true) { create(:epic, group: group) }
 
   # Reloading issues here is needed because when storing datetime on postgres
   # nanoseconds precision is ignored when fetching records but not when inserting,
   # which makes the expectations fails for created_at field.
-  let!(:issue1) { create(:issue, project: project, weight: 1).reload }
-  let!(:issue2) { create(:issue, project: project).reload }
-  let!(:issue3) { create(:issue, project: other_project).reload }
+  let_it_be(:issue1) { create(:issue, project: project, weight: 1).reload }
+  let_it_be(:issue2) { create(:issue, project: project).reload }
+  let_it_be(:issue3) { create(:issue, project: other_project).reload }
 
-  let!(:epic_issue1) { create(:epic_issue, issue: issue1, epic: epic, relative_position: 2) }
-  let!(:epic_issue2) { create(:epic_issue, issue: issue2, epic: epic, relative_position: 1) }
-  let!(:epic_issue3) { create(:epic_issue, issue: issue3, epic: epic, relative_position: 3) }
+  let_it_be(:epic_issue1) { create(:epic_issue, issue: issue1, epic: epic, relative_position: 2) }
+  let_it_be(:epic_issue2) { create(:epic_issue, issue: issue2, epic: epic, relative_position: 1) }
+  let_it_be(:epic_issue3) { create(:epic_issue, issue: issue3, epic: epic, relative_position: 3) }
 
   describe '#execute' do
     subject { described_class.new(epic, user).execute }

ee/spec/services/epic_issues/update_service_spec.rb

@@ -4,15 +4,15 @@ require 'spec_helper'
 
 RSpec.describe EpicIssues::UpdateService do
   describe '#execute' do
-    let(:user) { create(:user) }
-    let(:group) { create(:group) }
-    let(:epic) { create(:epic, group: group) }
-    let(:issues) { create_list(:issue, 4) }
-    let!(:epic_issue1) { create(:epic_issue, epic: epic, issue: issues[0], relative_position: 3) }
-    let!(:epic_issue2) { create(:epic_issue, epic: epic, issue: issues[1], relative_position: 600) }
-    let!(:epic_issue3) { create(:epic_issue, epic: epic, issue: issues[2], relative_position: 1200) }
-    let!(:epic_issue4) { create(:epic_issue, epic: epic, issue: issues[3], relative_position: 2000) }
-    let(:default_position_value) { Gitlab::Database::MAX_INT_VALUE / 2 }
+    let_it_be(:user) { create(:user) }
+    let_it_be(:group) { create(:group) }
+    let_it_be(:epic) { create(:epic, group: group) }
+    let_it_be(:issues) { create_list(:issue, 4) }
+    let_it_be(:epic_issue1, reload: true) { create(:epic_issue, epic: epic, issue: issues[0], relative_position: 3) }
+    let_it_be(:epic_issue2, reload: true) { create(:epic_issue, epic: epic, issue: issues[1], relative_position: 600) }
+    let_it_be(:epic_issue3, reload: true) { create(:epic_issue, epic: epic, issue: issues[2], relative_position: 1200) }
+    let_it_be(:epic_issue4, reload: true) { create(:epic_issue, epic: epic, issue: issues[3], relative_position: 2000) }
+    let_it_be(:default_position_value) { Gitlab::Database::MAX_INT_VALUE / 2 }
 
     before do
       group.add_developer(user)
@@ -28,10 +28,10 @@ RSpec.describe EpicIssues::UpdateService do
 
     context 'when moving issues between different epics' do
       before do
-        epic_issue3.update_attribute(:epic, create(:epic, group: group))
+        epic_issue3.update_attribute(:epic, build(:epic, group: group))
       end
 
-      let(:params) { { move_before_id: epic_issue3.id, move_after_id: epic_issue4.id } }
+      let_it_be(:params) { { move_before_id: epic_issue3.id, move_after_id: epic_issue4.id } }
 
       subject { order_issue(epic_issue1, params) }
 
@@ -50,7 +50,7 @@ RSpec.describe EpicIssues::UpdateService do
     end
 
     context 'moving issue to the first position' do
-      let(:params) { { move_after_id: epic_issue1.id } }
+      let_it_be(:params) { { move_after_id: epic_issue1.id } }
 
       context 'when some positions are close to each other' do
         before do
@@ -76,7 +76,7 @@ RSpec.describe EpicIssues::UpdateService do
     end
 
     context 'moving issue to the third position' do
-      let(:params) { { move_before_id: epic_issue3.id, move_after_id: epic_issue4.id } }
+      let_it_be(:params) { { move_before_id: epic_issue3.id, move_after_id: epic_issue4.id } }
 
       context 'when some positions are close to each other' do
         before do