moy-dom/test/listDiff/makeKeyIndexAndFree.test.js

A flexiable Virtual DOM library for building modern web interface.

import makeKeyIndexAndFree from '../../src/listDiff/makeKeyIndexAndFree'

describe('test makeKeyIndexAndFree', () => {
  test('just with keys', () => {
    expect(
      makeKeyIndexAndFree([{
        key: 0,
      }, {
        key: 1,
      }, {
        key: 2,
      }, {
        key: 3,
      }])
    ).toEqual({
      keyIndex: new Map([
        [0, 0],
        [1, 1],
        [2, 2],
        [3, 3],
      ]),
      free: [],
    })
  })

  test('just with frees', () => {
    expect(
      makeKeyIndexAndFree([{
        item: 0,
      }, {
        item: 1,
      }, {
        item: 2,
      }, {
        item: 3,
      }])
    ).toEqual({
      keyIndex: new Map(),
      free: [{
        item: 0,
      }, {
        item: 1,
      }, {
        item: 2,
      }, {
        item: 3,
      }]
    })
  })

  test('with keys and frees', () => {
    expect(
      makeKeyIndexAndFree([{
        key: 0,
      }, {
        item: 1,
      }, {
        key: 2,
      }, {
        item: 3,
      }])
    ).toEqual({
      keyIndex: new Map([
        [0, 0],
        [2, 2],
      ]),
      free: [{
        item: 1,
      }, {
        item: 3,
      }]
    })
  })
})