resolved some brakeman false positives

app/services/fake_quiz.rb

@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+# :nocov:
 class FakeQuiz
   def create_completed_quizzes num = 10
     num.times do
@@ -67,3 +68,4 @@ class FakeQuiz
       end
     end # rubocop:enable Metrics/MethodLength
 end
+# :nocov: