Revert "removed assign_quiz_dynamically test"

This reverts commit 89b42c4.

spec/controllers/review_mapping_controller_spec.rb

@@ -282,6 +282,16 @@
         expect(response).to redirect_to('/student_quizzes?id=1')
       end
     end
+
+    context 'when an error occurs during the assignment process' do
+      it 'displays an alert message' do
+        allow_any_instance_of(ReviewMappingController).to receive(:find_assignment).and_raise(StandardError)
+
+        get :assign_quiz_dynamically, params: { assignment_id: 1, reviewer_id: 1, questionnaire_id: 1, participant_id: 1 }
+
+        expect(flash[:alert]).to be_present
+      end
+    end
   end
 
   describe '#add_metareviewer' do