recoil/cjs/caches/__tests__/Recoil_treeCacheLRU-test.js.flow

Recoil - A state management library for React

/**
 * Copyright (c) Facebook, Inc. and its affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 * @emails oncall+recoil
 * @flow strict-local
 * @format
 */
'use strict';

const {
  getRecoilTestFn
} = require('../../__test_utils__/Recoil_TestingUtils');

let treeCacheLRU, loadableWithValue;
const testRecoil = getRecoilTestFn(() => {
  treeCacheLRU = require('../Recoil_treeCacheLRU');
  ({
    loadableWithValue
  } = require('../../adt/Recoil_Loadable'));
});
describe('treeCacheLRU()', () => {
  testRecoil('getting and setting cache', () => {
    const cache = treeCacheLRU(10);
    const [route1, loadable1] = [[['a', 2], ['b', 3]], loadableWithValue('value1')];
    const [route2, loadable2] = [[['a', 3], ['b', 4]], loadableWithValue('value2')];
    const [route3, loadable3] = [[['a', 4]], loadableWithValue('value3')];
    cache.set(route1, loadable1);
    cache.set(route2, loadable2);
    cache.set(route3, loadable3);
    expect(cache.get(nodeKey => route1.find(([key]) => key === nodeKey)?.[1])).toBe(loadable1);
    expect(cache.get(nodeKey => route2.find(([key]) => key === nodeKey)?.[1])).toBe(loadable2);
    expect(cache.get(nodeKey => route3.find(([key]) => key === nodeKey)?.[1])).toBe(loadable3);
    expect(cache.size()).toBe(3);
  });
  testRecoil('getting and setting cache (hitting max size)', () => {
    const cache = treeCacheLRU(2);
    const [route1, loadable1] = [[['a', 2], ['b', 3]], loadableWithValue('value1')];
    const [route2, loadable2] = [[['a', 3], ['b', 4]], loadableWithValue('value2')];
    const [route3, loadable3] = [[['a', 4]], loadableWithValue('value3')];
    cache.set(route1, loadable1);
    cache.set(route2, loadable2);
    cache.set(route3, loadable3);
    expect(cache.get(nodeKey => route1.find(([key]) => key === nodeKey)?.[1])).toBe(undefined);
    expect(cache.get(nodeKey => route2.find(([key]) => key === nodeKey)?.[1])).toBe(loadable2);
    expect(cache.get(nodeKey => route3.find(([key]) => key === nodeKey)?.[1])).toBe(loadable3);
    expect(cache.size()).toBe(2);
    cache.set(route1, loadable1);
    expect(cache.get(nodeKey => route1.find(([key]) => key === nodeKey)?.[1])).toBe(loadable1);
    expect(cache.get(nodeKey => route2.find(([key]) => key === nodeKey)?.[1])).toBe(undefined);
    expect(cache.size()).toBe(2);
  });
});