React + Jest + testing-library: "Please upgrade to at least react-dom@16.9.0 to remove this warning." ...但是 react-dom 已经是 16.9.0

Question

我正在使用 Jest 和 testing-library/react

为我的 React 应用编写测试

我的测试通过了，但我无法摆脱这个错误：

It looks like you're using a version of react-dom that supports the "act" function, but not an awaitable version of "act" which you will need. Please upgrade to at least react-dom@16.9.0 to remove this warning.

我还看到此警告的多个实例：

Warning: An update to ConnectFunction inside a test was not wrapped in act(...).

When testing, code that causes React state updates should be wrapped into act(...):

act(() => {
  /* fire events that update state */
});
/* assert on the output */

这是我的测试套件顶部的导入：

import React from "react";
import { BrowserRouter } from "react-router-dom";
import configureStore from 'redux-mock-store';
import thunk from 'redux-thunk';
import { createMemoryHistory } from 'history';

//testing-library/react
import { render, fireEvent, waitForElement, act } from '@testing-library/react';
import '@testing-library/jest-dom/extend-expect';
import {
  wait
} from '@testing-library/dom';
import MyComponent from '../MyComponent';

这是我的 package.json

  "dependencies": {
    "axios": "^0.18.1",
    "react": "^16.11.0",
    "react-dom": "^16.9.0",
    "react-scripts": "2.1.5",
  },
  "devDependencies": {
    "@testing-library/jest-dom": "^4.2.3",
    "@testing-library/react": "^9.3.2",
  }

react-dom 已经在 v16.9 上。我错过了什么？

令人沮丧的是，此错误似乎间歇性出现。当我尝试不同的东西时，它有时会在测试套件的几次运行中完全消失，然后 return.

Answer 1

经过几天与这个谜团的斗争，我终于重新启动了计算机，errors/warnings 消失了。我不明白为什么这很重要，因为我已经多次重新启动测试脚本，并且完全重新安装 node_modules 多次。我最好的猜测是它与从 react-test-renderer 模块到 testing-library 包装器的转换有关......但这纯粹是猜测。

• macOS v10.14.6
• 节点 v11.10.1
• npm v6.7.0

希望这能为其他人节省一些时间。