text: import DataContainer from '../../src/index.js'
  
  describe('transform transformation', () => {
    test('transform works as expected', () => {
      const dataContainer = new DataContainer({ a: [1, 2, 3, 4] })
      const transformed = dataContainer.transform(columns => {
        const b = columns.a.map(a => a ** 2)
        return { b }
      })
  
      expect(transformed.column('b')).toEqual([1, 4, 9, 16])
    })
  })
  