diff --git a/spec/serializers/context_commits_diff_entity_spec.rb b/spec/serializers/context_commits_diff_entity_spec.rb
index 9d74fbc9160bd48752551c8f630150779a292ccc..5dadd4f0abba2c39d58a72cfbd95501989f5d821 100644
--- a/spec/serializers/context_commits_diff_entity_spec.rb
+++ b/spec/serializers/context_commits_diff_entity_spec.rb
@@ -2,7 +2,7 @@
 
 require 'spec_helper'
 
-RSpec.describe ContextCommitsDiffEntity do
+RSpec.describe ContextCommitsDiffEntity, feature_category: :code_review_workflow do
   let_it_be(:merge_request) { create(:merge_request) }
   let_it_be(:mrcc1) { create(:merge_request_context_commit, merge_request: merge_request, sha: "cfe32cf61b73a0d5e9f13e774abde7ff789b1660") }
   let_it_be(:mrcc2) { create(:merge_request_context_commit, merge_request: merge_request, sha: "ae73cb07c9eeaf35924a10f713b364d32b2dd34f") }
diff --git a/spec/serializers/diff_file_entity_spec.rb b/spec/serializers/diff_file_entity_spec.rb
index 00083dd501af6ad0bdb1e1eea80d4a667f6b2fd8..2aeffecbcc828eafac364bb1ef83ad1f464a9f7c 100644
--- a/spec/serializers/diff_file_entity_spec.rb
+++ b/spec/serializers/diff_file_entity_spec.rb
@@ -2,7 +2,7 @@
 
 require 'spec_helper'
 
-RSpec.describe DiffFileEntity do
+RSpec.describe DiffFileEntity, feature_category: :code_review_workflow do
   include RepoHelpers
 
   let_it_be(:project) { create(:project, :repository) }
diff --git a/spec/serializers/diff_file_metadata_entity_spec.rb b/spec/serializers/diff_file_metadata_entity_spec.rb
index 6f76d812177db4694603ac7fd0937ca80439fa2e..7e8695b10f0d0809a1bb1d24059481c879b3d5b9 100644
--- a/spec/serializers/diff_file_metadata_entity_spec.rb
+++ b/spec/serializers/diff_file_metadata_entity_spec.rb
@@ -2,7 +2,7 @@
 
 require 'spec_helper'
 
-RSpec.describe DiffFileMetadataEntity do
+RSpec.describe DiffFileMetadataEntity, feature_category: :code_review_workflow do
   let(:merge_request) { create(:merge_request_with_diffs) }
   let(:diff_file) { merge_request.merge_request_diff.diffs.raw_diff_files.first }
   let(:options) { {} }
diff --git a/spec/serializers/diff_viewer_entity_spec.rb b/spec/serializers/diff_viewer_entity_spec.rb
index 7ee2f8ec12f3fadbdae5a050c01a4702952ef642..013028720d49402260461612f59eb321e629f30d 100644
--- a/spec/serializers/diff_viewer_entity_spec.rb
+++ b/spec/serializers/diff_viewer_entity_spec.rb
@@ -2,7 +2,7 @@
 
 require 'spec_helper'
 
-RSpec.describe DiffViewerEntity do
+RSpec.describe DiffViewerEntity, feature_category: :code_review_workflow do
   include RepoHelpers
 
   let(:project) { create(:project, :repository) }
diff --git a/spec/serializers/diffs_entity_spec.rb b/spec/serializers/diffs_entity_spec.rb
index 24c7a54f88a8d477a6bacb303ef8e0e7663526b5..a5fb58eeb3549aab8506489e2851229daafa60ce 100644
--- a/spec/serializers/diffs_entity_spec.rb
+++ b/spec/serializers/diffs_entity_spec.rb
@@ -2,7 +2,7 @@
 
 require 'spec_helper'
 
-RSpec.describe DiffsEntity do
+RSpec.describe DiffsEntity, feature_category: :code_review_workflow do
   let_it_be(:user) { create(:user) }
   let_it_be(:project) { create(:project, :repository) }
   let_it_be(:merge_request) { create(:merge_request_with_diffs, target_project: project, source_project: project) }
diff --git a/spec/serializers/diffs_metadata_entity_spec.rb b/spec/serializers/diffs_metadata_entity_spec.rb
index fd2a62f61d9bfa72bfac812fd67f512f9a17d77d..a550943a53fc65f1b05d2939b417c4aaa739e195 100644
--- a/spec/serializers/diffs_metadata_entity_spec.rb
+++ b/spec/serializers/diffs_metadata_entity_spec.rb
@@ -2,7 +2,7 @@
 
 require 'spec_helper'
 
-RSpec.describe DiffsMetadataEntity do
+RSpec.describe DiffsMetadataEntity, feature_category: :code_review_workflow do
   let(:user) { create(:user) }
   let(:project) { create(:project, :repository) }
   let(:request) { EntityRequest.new(project: project, current_user: user) }
diff --git a/spec/serializers/merge_request_basic_entity_spec.rb b/spec/serializers/merge_request_basic_entity_spec.rb
index 7aa1f47fda53fdcb1207f7cd1857fd2e2ff6a474..51722f43182bcd6acd9abcdbd2361d1ad0461be1 100644
--- a/spec/serializers/merge_request_basic_entity_spec.rb
+++ b/spec/serializers/merge_request_basic_entity_spec.rb
@@ -2,7 +2,7 @@
 
 require 'spec_helper'
 
-RSpec.describe MergeRequestBasicEntity do
+RSpec.describe MergeRequestBasicEntity, feature_category: :code_review_workflow do
   let(:resource) { build(:merge_request, params) }
   let(:params) { {} }
 
diff --git a/spec/serializers/merge_request_current_user_entity_spec.rb b/spec/serializers/merge_request_current_user_entity_spec.rb
index d4cbfe726c17d73fec52c47ba5ca90e69433c1cd..270d9ea05373e3e3d74b0dc0aa336f160ac2d9fc 100644
--- a/spec/serializers/merge_request_current_user_entity_spec.rb
+++ b/spec/serializers/merge_request_current_user_entity_spec.rb
@@ -2,7 +2,7 @@
 
 require 'spec_helper'
 
-RSpec.describe MergeRequestCurrentUserEntity do
+RSpec.describe MergeRequestCurrentUserEntity, feature_category: :code_review_workflow do
   let(:user) { create(:user) }
   let(:project) { create(:project, :repository) }
   let(:request) { EntityRequest.new(project: project, current_user: user) }
diff --git a/spec/serializers/merge_request_diff_entity_spec.rb b/spec/serializers/merge_request_diff_entity_spec.rb
index 9bf95e68874258d32e45f1356087909c958b3495..59cdcb4ec4ae67b8d144b29f3645a8aff7cc22e6 100644
--- a/spec/serializers/merge_request_diff_entity_spec.rb
+++ b/spec/serializers/merge_request_diff_entity_spec.rb
@@ -2,7 +2,7 @@
 
 require 'spec_helper'
 
-RSpec.describe MergeRequestDiffEntity do
+RSpec.describe MergeRequestDiffEntity, feature_category: :code_review_workflow do
   let_it_be(:project) { create(:project, :repository) }
 
   let(:request) { EntityRequest.new(project: project) }
diff --git a/spec/serializers/merge_request_serializer_spec.rb b/spec/serializers/merge_request_serializer_spec.rb
index a2ce1ed4ac255060efb4cdb01b7f1198696bff1f..6baf5cae06a50e142edbe602f1ad0ef700161948 100644
--- a/spec/serializers/merge_request_serializer_spec.rb
+++ b/spec/serializers/merge_request_serializer_spec.rb
@@ -2,7 +2,7 @@
 
 require 'spec_helper'
 
-RSpec.describe MergeRequestSerializer do
+RSpec.describe MergeRequestSerializer, feature_category: :code_review_workflow do
   let_it_be(:user) { create(:user) }
   let_it_be(:resource) { create(:merge_request, description: "Description") }
 
diff --git a/spec/serializers/merge_request_sidebar_basic_entity_spec.rb b/spec/serializers/merge_request_sidebar_basic_entity_spec.rb
index e950e6d6592a77352a45453169f2ce93d1a8d316..11e8837dbb77c2e62ac4d784e91dea6a7f0262a4 100644
--- a/spec/serializers/merge_request_sidebar_basic_entity_spec.rb
+++ b/spec/serializers/merge_request_sidebar_basic_entity_spec.rb
@@ -2,7 +2,7 @@
 
 require 'spec_helper'
 
-RSpec.describe MergeRequestSidebarBasicEntity do
+RSpec.describe MergeRequestSidebarBasicEntity, feature_category: :code_review_workflow do
   let(:project) { create :project, :repository }
   let(:merge_request) { create(:merge_request, source_project: project, target_project: project) }
   let(:user) { create(:user) }
diff --git a/spec/serializers/merge_request_sidebar_extras_entity_spec.rb b/spec/serializers/merge_request_sidebar_extras_entity_spec.rb
index 58f860097c26a79ee99695a5ddc455a0a81c87b3..f47e9dfa273818efe92bea580b8d82439f0c67e6 100644
--- a/spec/serializers/merge_request_sidebar_extras_entity_spec.rb
+++ b/spec/serializers/merge_request_sidebar_extras_entity_spec.rb
@@ -2,7 +2,7 @@
 
 require 'spec_helper'
 
-RSpec.describe MergeRequestSidebarExtrasEntity do
+RSpec.describe MergeRequestSidebarExtrasEntity, feature_category: :code_review_workflow do
   let_it_be(:assignee) { build(:user) }
   let_it_be(:reviewer) { build(:user) }
   let_it_be(:user) { build(:user) }
diff --git a/spec/serializers/paginated_diff_entity_spec.rb b/spec/serializers/paginated_diff_entity_spec.rb
index 50b3cbaf9992d30e5be6f3e3e94a13ff82745a8d..231f6d18b1fabf56bc5b9d15719e5ed0a813bb3e 100644
--- a/spec/serializers/paginated_diff_entity_spec.rb
+++ b/spec/serializers/paginated_diff_entity_spec.rb
@@ -2,7 +2,7 @@
 
 require 'spec_helper'
 
-RSpec.describe PaginatedDiffEntity do
+RSpec.describe PaginatedDiffEntity, feature_category: :code_review_workflow do
   let(:user) { create(:user) }
   let(:request) { double('request', current_user: user) }
   let(:merge_request) { create(:merge_request) }