vercel/utils/chunk-tests.test.js

const { intoChunks } = require('./chunk-tests');

describe('it should create chunks correctly', () => {
  it('should split chunks correctly less chunks than items', () => {
    const files = ['/first', '/second', '/third'];
    expect(intoChunks(1, 2, files)).toEqual([
      ['/first', '/second'],
      ['/third'],
    ]);
  });

  it('should split chunks correctly more chunks than items', () => {
    const files = ['/first', '/second', '/third'];
    expect(intoChunks(1, 5, files)).toEqual([
      ['/first'],
      ['/second'],
      ['/third'],
    ]);
  });

  it('should split chunks correctly equal chunks with items', () => {
    const files = ['/first', '/second', '/third'];
    expect(intoChunks(1, 3, files)).toEqual([
      ['/first'],
      ['/second'],
      ['/third'],
    ]);
  });
});