recoil/cjs/hooks/__tests__/Recoil_useRecoilValueLoadable-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 React, act, selector, constSelector, errorSelector, asyncSelector, renderElements, useRecoilValueLoadable, flushPromisesAndTimers;
const testRecoil = getRecoilTestFn(() => {
  React = require('react');
  ({
    act
  } = require('ReactTestUtils'));
  constSelector = require('../../recoil_values/Recoil_constSelector');
  errorSelector = require('../../recoil_values/Recoil_errorSelector');
  selector = require('../../recoil_values/Recoil_selector');
  ({
    asyncSelector,
    renderElements,
    flushPromisesAndTimers
  } = require('../../__test_utils__/Recoil_TestingUtils'));
  ({
    useRecoilValueLoadable
  } = require('../Recoil_Hooks'));
}); // These tests should cover the Loadable interface returned by useRecoilValueLoadable.
// It is also used by useRecoilStateNoThrow, waitForNone, and waitForAny

testRecoil('useRecoilValueLoadable - loadable with value', async () => {
  const valueSel = constSelector('VALUE');
  let promise;
  declare function ReadLoadable(): any;
  const c = renderElements(<ReadLoadable />);
  expect(c.textContent).toEqual('VALUE');
  await promise;
});
testRecoil('useRecoilValueLoadable - loadable with error', async () => {
  const valueSel = errorSelector('ERROR');
  let promise;
  declare function ReadLoadable(): any;
  const c = renderElements(<ReadLoadable />);
  expect(c.textContent).toEqual('VALUE');
  await promise;
});
testRecoil('useRecoilValueLoadable - loading loadable', async () => {
  const [valueSel, resolve] = asyncSelector();
  let resolved = false;
  const promises = [];
  declare function ReadLoadable(): any;
  const c = renderElements(<ReadLoadable />);
  expect(c.textContent).toEqual('LOADING');
  resolve('VALUE');
  resolved = true;
  act(() => jest.runAllTimers());
  expect(c.textContent).toEqual('VALUE');
  await Promise.all(promises.map(async promise => {
    if (!(promise instanceof Promise)) {
      // for flow
      throw new Error('Expected a promise');
    }

    const res = await promise;
    const val = typeof res === 'string' ? res : res.__value;
    expect(val).toBe('VALUE');
  }));
});
testRecoil('useRecoilValueLoadable() with an async throwing selector results in a loadable in error state', async () => {
  const asyncError = selector({
    key: 'asyncError',
    get: async () => {
      throw new Error('Test Error');
    }
  });
  declare var Test: () => any;
  const c = renderElements(<Test />);
  await act(() => flushPromisesAndTimers());
  expect(c.textContent).toEqual('Has error');
});