text: import React from 'react';
  import { render, cleanup, fireEvent } from '@testing-library/react'
  
  import DisplayNum from 'components/display_num';
  
  describe ('<DisplayNum>', () => {
    it ('render components', () => {
      const content = 3
      const { getByTestId } = render(
        <DisplayNum
          number={content}
          highlightClass="highlight"
        />
      );
      expect(getByTestId('number_block').textContent).toEqual("3");
    });
  });