context 'when current user is TA of the course which current assignment belongs to' do
      it 'allows certain action' do
        stub_current_user(ta, ta.role.name, ta.role)
        allow(TaMapping).to receive(:exists?).with(ta_id: 8, course_id: 1).and_return(true)
        expect(controller.send(:action_allowed?)).to be true