ConwaysGameOfLife.test.js

import { newGeneration } from './ConwaysGameOfLife'

describe('newGeneration', () => {
  it('should produce the next generation according to the rules', () => {
    expect(newGeneration([[0, 1, 0], [0, 1, 0], [0, 1, 0]]))
      .toEqual([[0, 0, 0], [1, 1, 1], [0, 0, 0]])
  })
})