text: import 'react-native';
  import React from 'react';
  import VocabScreen from '../../App/Containers/VocabScreen';
  import { shallow } from 'enzyme';
  import renderer from 'react-test-renderer';
  
  test('VocabScreen component renders correctly', () => {
    const tree = renderer.create(
      <VocabScreen
        navigation={{ state: { params: { selectedChapter: 'unit1' } } }}
      />).toJSON();
    expect(tree).toMatchSnapshot();
  });
  