开玩笑-ReferenceError：定义未定义

Question

我正在尝试使用玩笑来开始进行一些单元测试，但是我遇到了很多人似乎都遇到的错误，但我似乎无法弄清。

这就是我想要做的（我意识到不支持requirejs）：

jest.mock("../widgets/", () => {
  return <button>button</button>;
});

describe('TextInput', () => {
  describe('when user inputs a value', () => {
    it('calls correct function to handle change', () => {
      const handleChange = jest.fn();
      const value = "test"
      const wrapper = shallow(<TextInput handleChange={handleChange} />);
      const textInputElement = wrapper.find("#textfield");
      textInputElement.simulate('change', {target: { value }})

      expect(handleChange).toHaveBeenCalledTimes(1);
    });
  });
});

import React from "react";
import ReactDOM from "react-dom";
import * as TestUtils from "react-dom/test-utils";
import { TextInput } from "../widgets/";

这是我的package.json

"jest": {
    "collectCoverageFrom": [
      "src/**/*.js"
    ],
    "setupFiles": [

    ],
    "testMatch": [
      "**/src/**/?(*.)+(test).js"
    ],
    "testEnvironment": "node",
    "testURL": "http://localhost",
    "transform": {
      "^.+\\.(js)$": "./node_modules/babel-jest",
      "^.+\\.css$": "./config/jest/cssTransform.js",
      "^(?!.*\\.(js|jsx|mjs|css|json)$)": "./config/jest/fileTransform.js"
    },
    "transformIgnorePatterns": [
      "[/\\\\]node_modules[/\\\\].+\\.(js|jsx|mjs)$"
    ],
    "moduleNameMapper": {
      "^react-native$": "react-native-web"
    },
    "moduleFileExtensions": [
      "web.js",
      "js",
      "json",
      "web.jsx",
      "jsx",
      "node",
      "mjs"
    ]
 }

开玩笑时，出现错误ReferenceError: define is not defined，这是更详细的错误：

我将不胜感激！在过去的几天里一直在拉扯我的头发：-（

Answer 1

编辑：刚刚意识到根据文档toHaveBeenCalledTimes实际上也应该起作用。无论如何，您都可以尝试mock.calls.length。

---

据我所知，关于笑话功能模拟的断言不能像这样

expect(handleChange).toHaveBeenCalledTimes(1);

您应该尝试一下

expect(handleChange.mock.calls.length).toBe(1);

如docs

中所述