Add new issue type for requirements

app/models/issue.rb

@@ -87,7 +87,8 @@ class Issue < ApplicationRecord
   enum issue_type: {
     issue: 0,
     incident: 1,
-    test_case: 2 ## EE-only
+    test_case: 2, ## EE-only
+    requirement: 3 ## EE-only
   }
 
   alias_method :issuing_parent, :project

doc/api/graphql/reference/index.md

@@ -13385,6 +13385,7 @@ Issue type.
 | ----- | ----------- |
 | <a id="issuetypeincident"></a>`INCIDENT` | Incident issue type. |
 | <a id="issuetypeissue"></a>`ISSUE` | Issue issue type. |
+| <a id="issuetyperequirement"></a>`REQUIREMENT` | Requirement issue type. |
 | <a id="issuetypetest_case"></a>`TEST_CASE` | Test Case issue type. |
 
 ### `IterationState`

ee/app/services/ee/issues/build_service.rb

@@ -5,6 +5,8 @@ module EE
     module BuildService
       extend ::Gitlab::Utils::Override
 
+      DISABLED_ISSUE_TYPES = %w[test_case requirement].freeze
+
       def issue_params_from_template
         return {} unless project.feature_available?(:issuable_default_templates)
 
@@ -22,7 +24,7 @@ module EE
 
       override :allowed_issue_base_params
       def allowed_issue_base_params
-        return super - [:issue_type] if params[:issue_type] == 'test_case'
+        return super - [:issue_type] if DISABLED_ISSUE_TYPES.include?(params[:issue_type])
 
         super
       end

ee/spec/services/issues/build_service_spec.rb

@@ -63,10 +63,12 @@ RSpec.describe Issues::BuildService do
       let(:user) { guest }
 
       context 'setting issue type' do
-        it 'cannot set test_case' do
-          issue = build_issue(issue_type: 'test_case')
+        Issues::BuildService::DISABLED_ISSUE_TYPES.each do |type|
+          it "cannot set #{type}" do
+            issue = build_issue(issue_type: type)
 
-          expect(issue).to be_issue
+            expect(issue).to be_issue
+          end
         end
       end
     end