Block assign quick action for test cases

Prevent assign quick action
for issues with test case type

app/models/concerns/issuable.rb

@@ -196,6 +196,10 @@ module Issuable
       is_a?(Issue)
     end
 
+    def supports_assignee?
+      false
+    end
+
     def severity
       return IssuableSeverity::DEFAULT unless supports_severity?
 

app/models/concerns/issue_available_features.rb

@@ -9,7 +9,9 @@ module IssueAvailableFeatures
   class_methods do
     # EE only features are listed on EE::IssueAvailableFeatures
     def available_features_for_issue_types
-      {}.with_indifferent_access
+      {
+        assignee: %w(issue incident)
+      }.with_indifferent_access
     end
   end
 

app/models/issue.rb

@@ -434,6 +434,10 @@ class Issue < ApplicationRecord
     moved_to || duplicated_to
   end
 
+  def supports_assignee?
+    issue_type_supports?(:assignee)
+  end
+
   private
 
   def ensure_metrics

app/models/merge_request.rb

@@ -1774,6 +1774,10 @@ class MergeRequest < ApplicationRecord
     false
   end
 
+  def supports_assignee?
+    true
+  end
+
   private
 
   def with_rebase_lock

ee/app/models/concerns/ee/issuable.rb

@@ -6,7 +6,7 @@ module EE
     extend ::Gitlab::Utils::Override
 
     def supports_epic?
-      is_a?(Issue) && issue_type_supports?(:epics) && project.group.present?
+      false
     end
 
     def supports_health_status?

ee/app/models/ee/issue.rb

@@ -251,6 +251,11 @@ module EE
       super || promoted_to_epic
     end
 
+    override :supports_epic?
+    def supports_epic?
+      issue_type_supports?(:epics) && project.group.present?
+    end
+
     private
 
     def blocking_issues_ids

ee/changelogs/unreleased/issue_270585-block_assign_action.yml

+---
+title: Block /assign quick action for test cases
+merge_request: 50396
+author:
+type: other

ee/lib/ee/gitlab/quick_actions/issue_and_merge_request_actions.rb

@@ -14,7 +14,8 @@ module EE
           params '@user1 @user2'
           types Issue, MergeRequest
           condition do
-            quick_action_target.allows_multiple_assignees? &&
+            quick_action_target.supports_assignee? &&
+              quick_action_target.allows_multiple_assignees? &&
               quick_action_target.persisted? &&
               current_user.can?(:"admin_#{quick_action_target.to_ability_name}", project)
           end

ee/spec/services/quick_actions/interpret_service_spec.rb

@@ -44,6 +44,16 @@ RSpec.describe QuickActions::InterpretService do
           expect(updates[:assignee_ids]).to match_array([user.id, user3.id])
         end
 
+        context 'with test_case issue type' do
+          it 'does not mark to update assignee' do
+            test_case = create(:quality_test_case, project: project)
+
+            _, updates = service.execute("/assign @#{user3.username}", test_case)
+
+            expect(updates[:assignee_ids]).to eq(nil)
+          end
+        end
+
         context 'assign command with multiple assignees' do
           it 'fetches assignee and populates assignee_ids if content contains /assign' do
             issue.update!(assignee_ids: [user.id])
@@ -207,6 +217,16 @@ RSpec.describe QuickActions::InterpretService do
 
           expect(updates[:assignee_ids]).to match_array([current_user.id])
         end
+
+        context 'with test_case issue type' do
+          it 'does not mark to update assignee' do
+            test_case = create(:quality_test_case, project: project)
+
+            _, updates = service.execute("/reassign @#{current_user.username}", test_case)
+
+            expect(updates[:assignee_ids]).to eq(nil)
+          end
+        end
       end
     end
 

lib/gitlab/quick_actions/issue_and_merge_request_actions.rb

@@ -26,7 +26,7 @@ module Gitlab
         end
         types Issue, MergeRequest
         condition do
-          current_user.can?(:"admin_#{quick_action_target.to_ability_name}", project)
+          quick_action_target.supports_assignee? && current_user.can?(:"admin_#{quick_action_target.to_ability_name}", project)
         end
         parse_params do |assignee_param|
           extract_users(assignee_param)

spec/services/quick_actions/interpret_service_spec.rb

@@ -777,6 +777,11 @@ RSpec.describe QuickActions::InterpretService do
         let(:issuable) { issue }
       end
 
+      it_behaves_like 'assign command' do
+        let(:content) { "/assign @#{developer.username}" }
+        let(:issuable) { create(:incident, project: project) }
+      end
+
       it_behaves_like 'assign command' do
         let(:content) { "/assign @#{developer.username}" }
         let(:issuable) { merge_request }