context 'when 2 choices are correct' do
      it 'returns "valid"' do
        questions = { '1' => { txt: 'question text', iscorrect: '1' }, '2' => { txt: 'question text', iscorrect: '1' }, '3' => { txt: 'question text', iscorrect: '0' }, '4' => { txt: 'question text', iscorrect: '0' } }
        expect(multiple_choice_checkbox.isvalid(questions)).to eq('valid')