diff --git a/changelogs/unreleased/blackst0ne-replace-sidekiq-inline-with-perform-enqueued-jobs.yml b/changelogs/unreleased/blackst0ne-replace-sidekiq-inline-with-perform-enqueued-jobs.yml
new file mode 100644
index 00000000000..69e6b7d815a
--- /dev/null
+++ b/changelogs/unreleased/blackst0ne-replace-sidekiq-inline-with-perform-enqueued-jobs.yml
@@ -0,0 +1,5 @@
+---
+title: Replace 'Sidekiq::Testing.inline!' with 'perform_enqueued_jobs'
+merge_request: 20768
+author: "@blackst0ne"
+type: other
diff --git a/db/fixtures/development/04_project.rb b/db/fixtures/development/04_project.rb
index 51e69879c79..7d24aa9b199 100644
--- a/db/fixtures/development/04_project.rb
+++ b/db/fixtures/development/04_project.rb
@@ -1,6 +1,6 @@
 require './spec/support/sidekiq'
 
-Sidekiq::Testing.inline! do
+perform_enqueued_jobs do
   Gitlab::Seeder.quiet do
     project_urls = [
       'https://gitlab.com/gitlab-org/gitlab-test.git',
diff --git a/db/fixtures/development/06_teams.rb b/db/fixtures/development/06_teams.rb
index b218f4e71fd..a01f54507cf 100644
--- a/db/fixtures/development/06_teams.rb
+++ b/db/fixtures/development/06_teams.rb
@@ -1,6 +1,6 @@
 require './spec/support/sidekiq'
 
-Sidekiq::Testing.inline! do
+perform_enqueued_jobs do
   Gitlab::Seeder.quiet do
     Group.all.each do |group|
       User.all.sample(4).each do |user|
diff --git a/db/fixtures/development/17_cycle_analytics.rb b/db/fixtures/development/17_cycle_analytics.rb
index 7b9a4bad449..295bfc415e7 100644
--- a/db/fixtures/development/17_cycle_analytics.rb
+++ b/db/fixtures/development/17_cycle_analytics.rb
@@ -78,7 +78,7 @@ class Gitlab::Seeder::CycleAnalytics
 
   def seed!
     Sidekiq::Worker.skipping_transaction_check do
-      Sidekiq::Testing.inline! do
+      perform_enqueued_jobs do
         issues = create_issues
         puts '.'
 
diff --git a/db/fixtures/development/20_nested_groups.rb b/db/fixtures/development/20_nested_groups.rb
index 3d95e243f8a..da8f03bd8fe 100644
--- a/db/fixtures/development/20_nested_groups.rb
+++ b/db/fixtures/development/20_nested_groups.rb
@@ -1,6 +1,6 @@
 require './spec/support/sidekiq'
 
-Sidekiq::Testing.inline! do
+perform_enqueued_jobs do
   Gitlab::Seeder.quiet do
     flag = 'SEED_NESTED_GROUPS'
 
diff --git a/db/fixtures/development/22_labeled_issues_seed.rb b/db/fixtures/development/22_labeled_issues_seed.rb
index 3730e9c7958..9d1c3f15c39 100644
--- a/db/fixtures/development/22_labeled_issues_seed.rb
+++ b/db/fixtures/development/22_labeled_issues_seed.rb
@@ -11,7 +11,7 @@ class Gitlab::Seeder::LabeledIssues
   end
 
   def seed!
-    Sidekiq::Testing.inline! do
+    perform_enqueued_jobs do
       group = create_group
 
       create_projects(group)
diff --git a/spec/features/signed_commits_spec.rb b/spec/features/signed_commits_spec.rb
index 3d05474dca2..5003eb508c2 100644
--- a/spec/features/signed_commits_spec.rb
+++ b/spec/features/signed_commits_spec.rb
@@ -7,7 +7,7 @@ describe 'GPG signed commits', :js do
     user = create :user, email: 'unrelated.user@example.org'
     project.add_maintainer(user)
 
-    Sidekiq::Testing.inline! do
+    perform_enqueued_jobs do
       create :gpg_key, key: GpgHelpers::User1.public_key, user: user
     end
 
@@ -21,7 +21,7 @@ describe 'GPG signed commits', :js do
     end
 
     # user changes his email which makes the gpg key verified
-    Sidekiq::Testing.inline! do
+    perform_enqueued_jobs do
       user.skip_reconfirmation!
       user.update!(email: GpgHelpers::User1.emails.first)
     end
@@ -48,7 +48,7 @@ describe 'GPG signed commits', :js do
     end
 
     # user adds the gpg key which makes the signature valid
-    Sidekiq::Testing.inline! do
+    perform_enqueued_jobs do
       create :gpg_key, key: GpgHelpers::User1.public_key, user: user
     end
 
@@ -66,7 +66,7 @@ describe 'GPG signed commits', :js do
     end
 
     let(:user_1_key) do
-      Sidekiq::Testing.inline! do
+      perform_enqueued_jobs do
         create :gpg_key, key: GpgHelpers::User1.public_key, user: user_1
       end
     end
@@ -79,7 +79,7 @@ describe 'GPG signed commits', :js do
     end
 
     let(:user_2_key) do
-      Sidekiq::Testing.inline! do
+      perform_enqueued_jobs do
         create :gpg_key, key: GpgHelpers::User2.public_key, user: user_2
       end
     end
diff --git a/spec/lib/gitlab/hashed_storage/migrator_spec.rb b/spec/lib/gitlab/hashed_storage/migrator_spec.rb
index 813ae43b4d3..7eac2cacb90 100644
--- a/spec/lib/gitlab/hashed_storage/migrator_spec.rb
+++ b/spec/lib/gitlab/hashed_storage/migrator_spec.rb
@@ -65,7 +65,7 @@ describe Gitlab::HashedStorage::Migrator do
     end
 
     it 'migrate project' do
-      Sidekiq::Testing.inline! do
+      perform_enqueued_jobs do
         subject.migrate(project)
       end
 
diff --git a/spec/migrations/active_record/schedule_set_confidential_note_events_on_services_spec.rb b/spec/migrations/active_record/schedule_set_confidential_note_events_on_services_spec.rb
index 4395e2f8264..5c6f213e15b 100644
--- a/spec/migrations/active_record/schedule_set_confidential_note_events_on_services_spec.rb
+++ b/spec/migrations/active_record/schedule_set_confidential_note_events_on_services_spec.rb
@@ -31,7 +31,7 @@ describe ScheduleSetConfidentialNoteEventsOnServices, :migration, :sidekiq do
   end
 
   it 'correctly processes services' do
-    Sidekiq::Testing.inline! do
+    perform_enqueued_jobs do
       expect(services_table.where(confidential_note_events: nil).count).to eq 4
       expect(services_table.where(confidential_note_events: true).count).to eq 1
 
diff --git a/spec/migrations/migrate_stage_id_reference_in_background_spec.rb b/spec/migrations/migrate_stage_id_reference_in_background_spec.rb
index a837498e1b1..dd6f5325750 100644
--- a/spec/migrations/migrate_stage_id_reference_in_background_spec.rb
+++ b/spec/migrations/migrate_stage_id_reference_in_background_spec.rb
@@ -44,7 +44,7 @@ describe MigrateStageIdReferenceInBackground, :migration, :sidekiq do
   end
 
   it 'schedules background migrations' do
-    Sidekiq::Testing.inline! do
+    perform_enqueued_jobs do
       expect(jobs.where(stage_id: nil).count).to eq 5
 
       migrate!
diff --git a/spec/migrations/migrate_stages_statuses_spec.rb b/spec/migrations/migrate_stages_statuses_spec.rb
index ce35276cbf5..5483e24fce7 100644
--- a/spec/migrations/migrate_stages_statuses_spec.rb
+++ b/spec/migrations/migrate_stages_statuses_spec.rb
@@ -34,7 +34,7 @@ describe MigrateStagesStatuses, :sidekiq, :migration do
   end
 
   it 'correctly migrates stages statuses' do
-    Sidekiq::Testing.inline! do
+    perform_enqueued_jobs do
       expect(stages.where(status: nil).count).to eq 3
 
       migrate!
diff --git a/spec/migrations/normalize_ldap_extern_uids_spec.rb b/spec/migrations/normalize_ldap_extern_uids_spec.rb
index 56a78f52802..c6ea1e3e49e 100644
--- a/spec/migrations/normalize_ldap_extern_uids_spec.rb
+++ b/spec/migrations/normalize_ldap_extern_uids_spec.rb
@@ -38,7 +38,7 @@ describe NormalizeLdapExternUids, :migration, :sidekiq do
   end
 
   it 'migrates the LDAP identities' do
-    Sidekiq::Testing.inline! do
+    perform_enqueued_jobs do
       migrate!
       identities.where(id: 1..4).each do |identity|
         expect(identity.extern_uid).to eq("uid=foo #{identity.id},ou=people,dc=example,dc=com")
@@ -47,7 +47,7 @@ describe NormalizeLdapExternUids, :migration, :sidekiq do
   end
 
   it 'does not modify non-LDAP identities' do
-    Sidekiq::Testing.inline! do
+    perform_enqueued_jobs do
       migrate!
       identity = identities.last
       expect(identity.extern_uid).to eq(" uid = foo 5, ou = People, dc = example, dc = com ")
diff --git a/spec/migrations/schedule_create_gpg_key_subkeys_from_gpg_keys_spec.rb b/spec/migrations/schedule_create_gpg_key_subkeys_from_gpg_keys_spec.rb
index ed306fb3d62..96bef107599 100644
--- a/spec/migrations/schedule_create_gpg_key_subkeys_from_gpg_keys_spec.rb
+++ b/spec/migrations/schedule_create_gpg_key_subkeys_from_gpg_keys_spec.rb
@@ -20,7 +20,7 @@ describe ScheduleCreateGpgKeySubkeysFromGpgKeys, :migration, :sidekiq do
   end
 
   it 'schedules background migrations' do
-    Sidekiq::Testing.inline! do
+    perform_enqueued_jobs do
       expect(GpgKeySubkey.count).to eq(0)
 
       migrate!
diff --git a/spec/migrations/schedule_merge_request_diff_migrations_spec.rb b/spec/migrations/schedule_merge_request_diff_migrations_spec.rb
index d230f064444..9f7e47bae0d 100644
--- a/spec/migrations/schedule_merge_request_diff_migrations_spec.rb
+++ b/spec/migrations/schedule_merge_request_diff_migrations_spec.rb
@@ -33,7 +33,7 @@ describe ScheduleMergeRequestDiffMigrations, :migration, :sidekiq do
   end
 
   it 'schedules background migrations' do
-    Sidekiq::Testing.inline! do
+    perform_enqueued_jobs do
       non_empty = 'st_commits IS NOT NULL OR st_diffs IS NOT NULL'
 
       expect(merge_request_diffs.where(non_empty).count).to eq 3
diff --git a/spec/migrations/schedule_merge_request_diff_migrations_take_two_spec.rb b/spec/migrations/schedule_merge_request_diff_migrations_take_two_spec.rb
index 1aab4ae1650..5bcb923af7b 100644
--- a/spec/migrations/schedule_merge_request_diff_migrations_take_two_spec.rb
+++ b/spec/migrations/schedule_merge_request_diff_migrations_take_two_spec.rb
@@ -33,7 +33,7 @@ describe ScheduleMergeRequestDiffMigrationsTakeTwo, :migration, :sidekiq do
   end
 
   it 'migrates the data' do
-    Sidekiq::Testing.inline! do
+    perform_enqueued_jobs do
       non_empty = 'st_commits IS NOT NULL OR st_diffs IS NOT NULL'
 
       expect(merge_request_diffs.where(non_empty).count).to eq 3
diff --git a/spec/migrations/schedule_merge_request_latest_merge_request_diff_id_migrations_spec.rb b/spec/migrations/schedule_merge_request_latest_merge_request_diff_id_migrations_spec.rb
index c9fdbe95d13..76fe16581ac 100644
--- a/spec/migrations/schedule_merge_request_latest_merge_request_diff_id_migrations_spec.rb
+++ b/spec/migrations/schedule_merge_request_latest_merge_request_diff_id_migrations_spec.rb
@@ -53,7 +53,7 @@ describe ScheduleMergeRequestLatestMergeRequestDiffIdMigrations, :migration, :si
   end
 
   it 'schedules background migrations' do
-    Sidekiq::Testing.inline! do
+    perform_enqueued_jobs do
       expect(merge_requests_table.where(latest_merge_request_diff_id: nil).count).to eq 3
 
       migrate!
diff --git a/spec/migrations/schedule_set_confidential_note_events_on_webhooks_spec.rb b/spec/migrations/schedule_set_confidential_note_events_on_webhooks_spec.rb
index 027f4a91c90..fa4ddd5fbc7 100644
--- a/spec/migrations/schedule_set_confidential_note_events_on_webhooks_spec.rb
+++ b/spec/migrations/schedule_set_confidential_note_events_on_webhooks_spec.rb
@@ -31,7 +31,7 @@ describe ScheduleSetConfidentialNoteEventsOnWebhooks, :migration, :sidekiq do
   end
 
   it 'correctly processes web hooks' do
-    Sidekiq::Testing.inline! do
+    perform_enqueued_jobs do
       expect(web_hooks_table.where(confidential_note_events: nil).count).to eq 4
       expect(web_hooks_table.where(confidential_note_events: true).count).to eq 1
 
diff --git a/spec/models/ci/build_trace_chunk_spec.rb b/spec/models/ci/build_trace_chunk_spec.rb
index 774a638b430..915bf134d57 100644
--- a/spec/models/ci/build_trace_chunk_spec.rb
+++ b/spec/models/ci/build_trace_chunk_spec.rb
@@ -179,7 +179,7 @@ describe Ci::BuildTraceChunk, :clean_gitlab_redis_shared_state do
         end
 
         it 'migrates data to object storage' do
-          Sidekiq::Testing.inline! do
+          perform_enqueued_jobs do
             subject
 
             build_trace_chunk.reload
@@ -201,7 +201,7 @@ describe Ci::BuildTraceChunk, :clean_gitlab_redis_shared_state do
         end
 
         it 'does not migrate data to object storage' do
-          Sidekiq::Testing.inline! do
+          perform_enqueued_jobs do
             data_store = build_trace_chunk.data_store
 
             subject
diff --git a/spec/models/spam_log_spec.rb b/spec/models/spam_log_spec.rb
index 0d6b4384ada..90a2caaeb88 100644
--- a/spec/models/spam_log_spec.rb
+++ b/spec/models/spam_log_spec.rb
@@ -22,7 +22,7 @@ describe SpamLog do
       spam_log = build(:spam_log)
       user = spam_log.user
 
-      Sidekiq::Testing.inline! do
+      perform_enqueued_jobs do
         spam_log.remove_user(deleted_by: admin)
       end
 
diff --git a/spec/requests/api/project_import_spec.rb b/spec/requests/api/project_import_spec.rb
index 41243854ebc..55332f56508 100644
--- a/spec/requests/api/project_import_spec.rb
+++ b/spec/requests/api/project_import_spec.rb
@@ -102,7 +102,7 @@ describe API::ProjectImport do
     it 'correctly overrides params during the import' do
       override_params = { 'description' => 'Hello world' }
 
-      Sidekiq::Testing.inline! do
+      perform_enqueued_jobs do
         post api('/projects/import', user),
              path: 'test-import',
              file: fixture_file_upload(file),
diff --git a/spec/requests/api/users_spec.rb b/spec/requests/api/users_spec.rb
index a97c3f3461a..b3079c0a77b 100644
--- a/spec/requests/api/users_spec.rb
+++ b/spec/requests/api/users_spec.rb
@@ -1067,7 +1067,7 @@ describe API::Users do
     end
 
     it "deletes user" do
-      Sidekiq::Testing.inline! { delete api("/users/#{user.id}", admin) }
+      perform_enqueued_jobs { delete api("/users/#{user.id}", admin) }
 
       expect(response).to have_gitlab_http_status(204)
       expect { User.find(user.id) }.to raise_error ActiveRecord::RecordNotFound
@@ -1079,30 +1079,30 @@ describe API::Users do
     end
 
     it "does not delete for unauthenticated user" do
-      Sidekiq::Testing.inline! { delete api("/users/#{user.id}") }
+      perform_enqueued_jobs { delete api("/users/#{user.id}") }
       expect(response).to have_gitlab_http_status(401)
     end
 
     it "is not available for non admin users" do
-      Sidekiq::Testing.inline! { delete api("/users/#{user.id}", user) }
+      perform_enqueued_jobs { delete api("/users/#{user.id}", user) }
       expect(response).to have_gitlab_http_status(403)
     end
 
     it "returns 404 for non-existing user" do
-      Sidekiq::Testing.inline! { delete api("/users/999999", admin) }
+      perform_enqueued_jobs { delete api("/users/999999", admin) }
       expect(response).to have_gitlab_http_status(404)
       expect(json_response['message']).to eq('404 User Not Found')
     end
 
     it "returns a 404 for invalid ID" do
-      Sidekiq::Testing.inline! { delete api("/users/ASDF", admin) }
+      perform_enqueued_jobs { delete api("/users/ASDF", admin) }
 
       expect(response).to have_gitlab_http_status(404)
     end
 
     context "hard delete disabled" do
       it "moves contributions to the ghost user" do
-        Sidekiq::Testing.inline! { delete api("/users/#{user.id}", admin) }
+        perform_enqueued_jobs { delete api("/users/#{user.id}", admin) }
 
         expect(response).to have_gitlab_http_status(204)
         expect(issue.reload).to be_persisted
@@ -1112,7 +1112,7 @@ describe API::Users do
 
     context "hard delete enabled" do
       it "removes contributions" do
-        Sidekiq::Testing.inline! { delete api("/users/#{user.id}?hard_delete=true", admin) }
+        perform_enqueued_jobs { delete api("/users/#{user.id}?hard_delete=true", admin) }
 
         expect(response).to have_gitlab_http_status(204)
         expect(Issue.exists?(issue.id)).to be_falsy
diff --git a/spec/services/groups/destroy_service_spec.rb b/spec/services/groups/destroy_service_spec.rb
index a9baccd061a..b54491cf5f9 100644
--- a/spec/services/groups/destroy_service_spec.rb
+++ b/spec/services/groups/destroy_service_spec.rb
@@ -49,7 +49,7 @@ describe Groups::DestroyService do
       context 'Sidekiq inline' do
         before do
           # Run sidekiq immediately to check that renamed dir will be removed
-          Sidekiq::Testing.inline! { destroy_group(group, user, async) }
+          perform_enqueued_jobs { destroy_group(group, user, async) }
         end
 
         it 'verifies that paths have been deleted' do
diff --git a/spec/services/projects/create_from_template_service_spec.rb b/spec/services/projects/create_from_template_service_spec.rb
index 9aa9237d875..a43da01f37e 100644
--- a/spec/services/projects/create_from_template_service_spec.rb
+++ b/spec/services/projects/create_from_template_service_spec.rb
@@ -28,7 +28,7 @@ describe Projects::CreateFromTemplateService do
 
   context 'the result project' do
     before do
-      Sidekiq::Testing.inline! do
+      perform_enqueued_jobs do
         @project = subject.execute
       end
 
diff --git a/spec/services/projects/destroy_service_spec.rb b/spec/services/projects/destroy_service_spec.rb
index 38660ad7a01..e428808ab68 100644
--- a/spec/services/projects/destroy_service_spec.rb
+++ b/spec/services/projects/destroy_service_spec.rb
@@ -45,18 +45,18 @@ describe Projects::DestroyService do
   shared_examples 'handles errors thrown during async destroy' do |error_message|
     it 'does not allow the error to bubble up' do
       expect do
-        Sidekiq::Testing.inline! { destroy_project(project, user, {}) }
+        perform_enqueued_jobs { destroy_project(project, user, {}) }
       end.not_to raise_error
     end
 
     it 'unmarks the project as "pending deletion"' do
-      Sidekiq::Testing.inline! { destroy_project(project, user, {}) }
+      perform_enqueued_jobs { destroy_project(project, user, {}) }
 
       expect(project.reload.pending_delete).to be(false)
     end
 
     it 'stores an error message in `projects.delete_error`' do
-      Sidekiq::Testing.inline! { destroy_project(project, user, {}) }
+      perform_enqueued_jobs { destroy_project(project, user, {}) }
 
       expect(project.reload.delete_error).to be_present
       expect(project.delete_error).to include(error_message)
@@ -66,7 +66,7 @@ describe Projects::DestroyService do
   context 'Sidekiq inline' do
     before do
       # Run sidekiq immediatly to check that renamed repository will be removed
-      Sidekiq::Testing.inline! { destroy_project(project, user, {}) }
+      perform_enqueued_jobs { destroy_project(project, user, {}) }
     end
 
     context 'when has remote mirrors' do
@@ -110,7 +110,7 @@ describe Projects::DestroyService do
     end
 
     it 'keeps project team intact upon an error' do
-      Sidekiq::Testing.inline! do
+      perform_enqueued_jobs do
         begin
           destroy_project(project, user, {})
         rescue ::Redis::CannotConnectError
@@ -128,7 +128,7 @@ describe Projects::DestroyService do
       before do
         project.project_feature.update_attribute("issues_access_level", ProjectFeature::PRIVATE)
         # Run sidekiq immediately to check that renamed repository will be removed
-        Sidekiq::Testing.inline! { destroy_project(project, user, {}) }
+        perform_enqueued_jobs { destroy_project(project, user, {}) }
       end
 
       it_behaves_like 'deleting the project'
@@ -172,7 +172,7 @@ describe Projects::DestroyService do
 
         it 'allows error to bubble up and rolls back project deletion' do
           expect do
-            Sidekiq::Testing.inline! { destroy_project(project, user, {}) }
+            perform_enqueued_jobs { destroy_project(project, user, {}) }
           end.to raise_error(Exception, 'Other error message')
 
           expect(project.reload.pending_delete).to be(false)
diff --git a/spec/services/projects/housekeeping_service_spec.rb b/spec/services/projects/housekeeping_service_spec.rb
index 1cf373d1d72..18ecef1c0a1 100644
--- a/spec/services/projects/housekeeping_service_spec.rb
+++ b/spec/services/projects/housekeeping_service_spec.rb
@@ -35,7 +35,7 @@ describe Projects::HousekeepingService do
       allow(subject).to receive(:gc_period).and_return(1)
       project.increment_pushes_since_gc
 
-      Sidekiq::Testing.inline! do
+      perform_enqueued_jobs do
         expect { subject.execute }.to change { project.pushes_since_gc }.to(0)
       end
     end
diff --git a/spec/services/users/destroy_service_spec.rb b/spec/services/users/destroy_service_spec.rb
index f82d4b483e7..3bae8bfbd42 100644
--- a/spec/services/users/destroy_service_spec.rb
+++ b/spec/services/users/destroy_service_spec.rb
@@ -173,7 +173,7 @@ describe Users::DestroyService do
 
     describe "user personal's repository removal" do
       before do
-        Sidekiq::Testing.inline! { service.execute(user) }
+        perform_enqueued_jobs { service.execute(user) }
       end
 
       context 'legacy storage' do
diff --git a/spec/workers/storage_migrator_worker_spec.rb b/spec/workers/storage_migrator_worker_spec.rb
index 815432aacce..808084c8f7c 100644
--- a/spec/workers/storage_migrator_worker_spec.rb
+++ b/spec/workers/storage_migrator_worker_spec.rb
@@ -13,7 +13,7 @@ describe StorageMigratorWorker do
     end
 
     it 'migrates projects in the specified range' do
-      Sidekiq::Testing.inline! do
+      perform_enqueued_jobs do
         worker.perform(ids.min, ids.max)
       end