Prevent rendering test case as an issue

Redirect to test cases show when
when visiting a test case from an issue url

ee/app/controllers/ee/projects/issues_controller.rb

@@ -14,6 +14,8 @@ module EE
           populate_vulnerability_id
         end
 
+        before_action :redirect_if_test_case, only: [:show]
+
         feature_category :issue_tracking, [:delete_description_version, :description_diff]
       end
 
@@ -113,6 +115,12 @@ module EE
       def populate_vulnerability_id
         self.vulnerability_id = params[:vulnerability_id] if can?(current_user, :read_vulnerability, project)
       end
+
+      def redirect_if_test_case
+        return unless issue.test_case?
+
+        redirect_to project_quality_test_case_path(project, issue)
+      end
     end
   end
 end

ee/changelogs/unreleased/issue_300147.yml

+---
+title: Prevent rendering test cases as issues
+merge_request: 55410
+author:
+type: fixed

ee/spec/requests/projects/issues_controller_spec.rb

@@ -36,6 +36,20 @@ RSpec.describe Projects::IssuesController do
         expect { get_show }.not_to exceed_query_limit(control)
       end
     end
+
+    context 'with test case' do
+      before do
+        project.add_guest(user)
+      end
+
+      it 'redirects to test cases show' do
+        test_case = create(:quality_test_case, project: project)
+
+        get project_issue_path(project, test_case)
+
+        expect(response).to redirect_to(project_quality_test_case_path(project, test_case))
+      end
+    end
   end
 
   describe 'GET #index' do