recoil/cjs/core/__tests__/Recoil_core-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
 * @format
 */
'use strict';

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

let a, atom, store, nullthrows, getNodeLoadable, setNodeValue;
const testRecoil = getRecoilTestFn(() => {
  const {
    makeStore
  } = require('../../testing/Recoil_TestingUtils');

  atom = require('../../recoil_values/Recoil_atom');
  nullthrows = require('../../util/Recoil_nullthrows');
  ({
    getNodeLoadable,
    setNodeValue
  } = require('../Recoil_FunctionalCore'));
  a = atom<number>({
    key: 'a',
    default: 0
  }).key;
  store = makeStore();
});
testRecoil('read default value', () => {
  expect(getNodeLoadable(store, store.getState().currentTree, a)[1]).toMatchObject({
    state: 'hasValue',
    contents: 0
  });
});
testRecoil('setNodeValue returns empty deps and written value when writing atom', () => {
  const [depMap, writes] = setNodeValue(store, store.getState().currentTree, a, 1);
  expect(depMap.size).toBe(0);
  expect(nullthrows(writes.get(a)).contents).toBe(1);
});