text: const exercise38 = require('./exercise38');
  const result = [ 0, 1, 4, 9, 16 ];
  
  test('Check if function square is define', () => {
      expect(exercise38.square).toBeDefined();
  })
  
  test('Check the function square', () => {
      expect(exercise38.square(2)).toEqual(4);
  })
  
  test('Check if function showSquare is define', () => {
      expect(exercise38.showSquare).toBeDefined();
  })
  
  test('Check the function showSquare', () => {
      expect(exercise38.showSquare(4)).toEqual(result);
  })
  