Vite / Jest / React-Testing

mrzz3bfm  于 6个月前  发布在  Jest
关注(0)|答案(2)|浏览(67)

我尝试使用Jest在React应用程序中进行测试;我的应用程序使用Vite作为模块编译器。问题是,每次我运行测试时,我都会得到以下错误:

> [email protected] test
> jest

 FAIL  src/test/App.test.jsx
  ● Test suite failed to run

    Jest encountered an unexpected token

    Jest failed to parse a file. This happens e.g. when your code or its dependencies use non-standard JavaScript syntax, or when Jest is not configured to support such syntax.

    Out of the box Jest supports Babel, which will be used to transform your files into valid JS based on your Babel configuration.

    By default "node_modules" folder is ignored by transformers.

    Here's what you can do:
     • If you are trying to use ECMAScript Modules, see https://jestjs.io/docs/ecmascript-modules for how to 
enable it.
     • If you are trying to use TypeScript, see https://jestjs.io/docs/getting-started#using-typescript      
     • To have some of your "node_modules" files transformed, you can specify a custom "transformIgnorePatterns" in your config.
     • If you need a custom transformation specify a "transform" option in your config.
     • If you simply want to mock your non-JS modules (e.g. binary assets) you can stub them out with the "moduleNameMapper" config option.

    You'll find more details and examples of these config options in the docs:
    https://jestjs.io/docs/configuration
    For information about custom transformations, see:
    https://jestjs.io/docs/code-transformation

    Details:

    SyntaxError: C:\Users\Tomas\Desktop\react-test\src\test\App.test.jsx: Support for the experimental syntax 'jsx' isn't currently enabled (8:30):

       6 |
       7 | test("renders content", ()=>{
    >  8 |     const component = render(<App></App>)
         |                              ^
       9 |     console.log(component)
      10 | })

    Add @babel/preset-react (https://git.io/JfeDR) to the 'presets' section of your Babel config to enable transformation.
    If you want to leave it as-is, add @babel/plugin-syntax-jsx (https://git.io/vb4yA) to the 'plugins' section to enable parsing.

      at Parser._raise (node_modules/@babel/parser/src/parser/error.js:150:45)
      at Parser.raiseWithData (node_modules/@babel/parser/src/parser/error.js:145:17)
      at Parser.expectOnePlugin (node_modules/@babel/parser/src/parser/util.js:214:18)
      at Parser.parseExprAtom (node_modules/@babel/parser/src/parser/expression.js:1238:16)
      at Parser.parseExprSubscripts (node_modules/@babel/parser/src/parser/expression.js:682:23)
      at Parser.parseUpdate (node_modules/@babel/parser/src/parser/expression.js:662:21)
      at Parser.parseMaybeUnary (node_modules/@babel/parser/src/parser/expression.js:633:23)
      at Parser.parseMaybeUnaryOrPrivate (node_modules/@babel/parser/src/parser/expression.js:388:14)        
      at Parser.parseExprOps (node_modules/@babel/parser/src/parser/expression.js:398:23)
      at Parser.parseMaybeConditional (node_modules/@babel/parser/src/parser/expression.js:356:23)

Test Suites: 1 failed, 1 total
Tests:       0 total
Snapshots:   0 total
Time:        1.379 s
Ran all test suites.

字符串
Package.json

{
  "name": "react-test",
  "private": true,
  "version": "0.0.0",
  "type": "module",
  "scripts": {
    "dev": "vite",
    "build": "vite build",
    "preview": "vite preview",
    "test": "jest"
  },
  "dependencies": {
    "react": "^17.0.2",
    "react-dom": "^17.0.2"
  },
  "jest": {
    "verbose": true,
    "testEnvironment": "jsdom",
    "transform": {
      "^.+\\.(js|jsx)$": "babel-jest"
    },
    "moduleFileExtensions": [
      "js",
      "jsx"
    ],
    "moduleNameMapper": {
      "\\.(gif|ttf|eot|svg|png)$": "<rootDir>/test/__mocks__/fileMock.js",
      "\\.(css|less|sass|scss)$": "identity-obj-proxy"
    }
  },
  "devDependencies": {
    "@babel/plugin-syntax-jsx": "^7.16.7",
    "@testing-library/jest-dom": "^5.16.2",
    "@testing-library/react": "^12.1.3",
    "@types/jest": "^27.4.1",
    "@vitejs/plugin-react": "^1.0.7",
    "jest": "^27.5.1",
    "vite": "^2.8.0"
  }
}


App.test.jsx

import React from "react";
import "@testing-library/jest-dom/extend-expect"
import { render } from "@testing-library/react";
import App from "../App.jsx";

test("renders content", ()=>{
    const component = render(<App></App>)
    console.log(component)
})

qc6wkl3g

qc6wkl3g1#

错误输出是正确的,Jest在本地节点二进制文件上运行,并要求将jsx文件转换为它可以理解的语法。
默认情况下,Vite不会进行这种转换。它的设计目的是将您的代码转换并捆绑到适合浏览器的bundle.js中(它可以进行其他类型的输出,如库。您需要调整vite.config.js)。
幸运的是,其他人已经为您解决了这个问题,我推荐使用vitest,因为您不需要下载另一个transformer Transformer,也不需要花费大量时间来设置复杂的构建脚本。
以下是如何快速设置它的指南:
https://www.eternaldev.com/blog/testing-a-react-application-with-vitest/
迁移指南:
https://vitest.dev/guide/migration.html

ulmd4ohb

ulmd4ohb2#

  • 这是为初学者从头开始设置:Vite,Jest,React,Typescript *
    • 我听说Vite和Jest在某种程度上不兼容。

但对我来说,在目前的阶段,它似乎工作。

    • (虽然,我没有深入的知识,不确定我错过了什么。
    • (如果你使用npm而不是pnpm,只需将pnpm add替换为npm install,它应该可以工作)*

过程

设置Vite
选择React Typescript
安装Jest & React测试库

pnpm create vite
pnpm add --save-dev jest @types/jest ts-jest @testing-library/jest-dom @testing-library/react @testing-library/user-event

字符串
proj-test-vitejest/src下创建主测试文件Greet.test.tsx
确保你import '@testing-library/jest-dom';

// import { describe, expect, test, it } from '@jest/globals'; // this doesnt work...
// import { describe, expect, test, it } from '@testing-library/jest-dom';
// import userEvent from '@testing-library/user-event';
// import '@testing-library/jest-dom/extend-expect';
// import 'jest-dom/extend-expect';
// import { Greet } from './Greet';

import '@testing-library/jest-dom';
import { render } from '@testing-library/react';

describe('Greet', () => {
  test('find AA', () => {
    const { getByText } = render(<div>Banana and Apple</div>);
    const textElement = getByText(/Banana/); // screen.getByText(/Banana/);
    expect(textElement).toBeInTheDocument();
  });

  test('find BB', () => {
    const { getByText } = render(<div>Banana and Apple</div>);
    const textElement = getByText(/Mango/);
    expect(textElement).toBeInTheDocument();
  });
});


现在打印脚本eslint,intellisense,import,应该都很好
此时无需手动更改tsconfig.jsonpackage.json

你应该能够找到方法toBeInTheDocument()
H:\Using\proj-test-vitejest\node_modules\.pnpm\@ [[email protected]](https://stackoverflow.com/cdn-cgi/l/email-protection) _@ [[email protected]](https://stackoverflow.com/cdn-cgi/l/email-protection) [[email protected]](https://stackoverflow.com/cdn-cgi/l/email-protection) \node_modules\@testing-library\jest-dom\types\matchers.d.ts
此时不需要其他程序,如

  • "types": ["node", "jest", "@testing-library/jest-dom"],
  • setupFilesAfterEnv: [ "<rootDir>/support/setupTests.js" ],
  • npm install @types/testing-library__jest-dom -D

运行npx jest,将失败

SyntaxError: H:\Using\proj-test-vitejest\src\Greet.test.tsx: Support for the experimental syntax 'jsx' isn't currently enabled (13:12):


所以
创建jest.config.ts
将以下内容添加到jest.config.ts

transform: {
      '^.+\\.(ts|tsx|js|jsx)$': 'ts-jest',
    },


Babel throwing Support for the experimental syntax 'jsx' isn't currently enabled
npx jest再试一次,失败,

Error: Jest: Failed to parse the TypeScript config file H:\Using\proj-test-vitejest\jest.config.ts
  Error: Jest: 'ts-node' is required for the TypeScript configuration files. Make sure it is installed


所以

pnpm install --save-dev ts-node


npx jest再试一次,失败,

The error below may be caused by using the wrong test environment, see https://jestjs.io/docs/configuration#testenvironment-string.
    Consider using the "jsdom" test environment.```
Test environment jest-environment-jsdom cannot be found. Make sure the testEnvironment configuration option points to an existing node module.

所以
将以下内容添加到jest.config.ts

testEnvironment: 'jsdom',
pnpm add --save-dev jest-environment-jsdom

npx jest再试一次,你现在成功了。
结果为(1次成功,1次失败(故意))

其他

如果你厌倦了每个测试文件中的import '@testing-library/jest-dom';
你可以在Greet.test.tsx中注解它

// import '@testing-library/jest-dom';


proj-test-vitejest/src下创建jest.setup.ts

import '@testing-library/jest-dom';
// import "@testing-library/jest-dom/extend-expect";

将以下内容添加到jest.config.ts

setupFilesAfterEnv: [
      // '@testing-library/jest-dom',
      // "@testing-library/jest-dom/extend-expect",
      '<rootDir>/jest.setup.ts'
    ],

proj-test-vitejest/src下创建Globals.d.ts

import '@testing-library/jest-dom';
// import "@testing-library/jest-dom/extend-expect";
// declare module '@testing-library/jest-dom';

将以下内容添加到tsconfig.json

"include": ["src", "Globals.d.ts"],

Property 'toBeInTheDocument' does not exist on type 'Matchers'

概述

  • 终端日志
PS H:\Using> pnpm create vite
../.pnpm-store/v3/tmp/dlx-5716           |   +1 +
../.pnpm-store/v3/tmp/dlx-5716           | Progress: resolved 1, reused 1, downloaded 0, added 1, done
√ Project name: ... proj-test-vitejest
√ Select a framework: » React
√ Select a variant: » TypeScript

Scaffolding project in H:\Using\proj-test-vitejest...

Done. Now run:

  cd proj-test-vitejest
  pnpm install
  pnpm run dev

PS H:\Using> cd proj-test-vitejest
PS H:\Using\proj-test-vitejest> pnpm add --save-dev jest @types/jest ts-jest @testing-library/jest-dom @testing-library/react @testing-library/user-event
Packages: +456
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Progress: resolved 489, reused 456, downloaded 0, added 456, done

dependencies:
+ react 18.2.0
+ react-dom 18.2.0

devDependencies:
+ @testing-library/jest-dom 6.1.4
+ @testing-library/react 14.1.2
+ @testing-library/user-event 14.5.1
+ @types/jest 29.5.10
+ @types/react 18.2.39
+ @types/react-dom 18.2.17
+ @typescript-eslint/eslint-plugin 6.13.1
+ @typescript-eslint/parser 6.13.1
+ @vitejs/plugin-react 4.2.0
+ eslint 8.54.0
+ eslint-plugin-react-hooks 4.6.0
+ eslint-plugin-react-refresh 0.4.4
+ jest 29.7.0
+ ts-jest 29.1.1
+ typescript 5.3.2
+ vite 5.0.3

Done in 1m 15.7s
PS H:\Using\proj-test-vitejest> code .
PS H:\Using\proj-test-vitejest> pnpm install --save-dev ts-node
Packages: +19 -6
+++++++++++++++++++------
Progress: resolved 502, reused 469, downloaded 0, added 19, done

devDependencies:
+ ts-node 10.9.1

Done in 2.6s
PS H:\Using\proj-test-vitejest> pnpm add --save-dev jest-environment-jsdom
 WARN  2 deprecated subdependencies found: [email protected], [email protected]
Packages: +47
+++++++++++++++++++++++++++++++++++++++++++++++
Progress: resolved 549, reused 516, downloaded 0, added 47, done

devDependencies:
+ jest-environment-jsdom 29.7.0

Done in 3.5s
PS H:\Using\proj-test-vitejest> npx jest
ts-jest[config] (WARN) message TS151001: If you have issues related to imports, you should consider setting `esModuleInterop` to `true` in your TypeScript configuration file (usually `tsconfig.json`). See https://blogs.msdn.microsoft.com/typescript/2018/01/31/announcing-typescript-2-7/#easier-ecmascript-module-interoperability for more information.
FAIL  src/Greet.test.tsx
  Greet
    √ find AA (24 ms)
    × find BB (6 ms)

  ● Greet › find BB

    TestingLibraryElementError: Unable to find an element with the text: /Mango/. This could be because the text is broken up by multiple elements. In this case, you can provide a function for your text matcher to make your matcher more flexible.

    Ignored nodes: comments, script, style
    <body>
      <div>
        <div>
          Banana and Apple
        </div>
      </div>
    </body>

      18 |   test('find BB', () => {
      19 |     const { getByText } = render(<div>Banana and Apple</div>);
    > 20 |     const textElement = getByText(/Mango/);
        |                         ^
      21 |     expect(textElement).toBeInTheDocument();
      22 |   });
      23 | });

      at Object.getElementError (node_modules/.pnpm/@[email protected]/node_modules/@testing-library/dom/dist/config.js:37:19)
      at Object.<anonymous> (src/Greet.test.tsx:20:25)

Test Suites: 1 failed, 1 total
Tests:       1 failed, 1 passed, 2 total
Snapshots:   0 total
Time:        2.481 s
Ran all test suites.
PS H:\Using\proj-test-vitejest>
  • package.json
{
  "name": "proj-test-vitejest",
  "private": true,
  "version": "0.0.0",
  "type": "module",
  "scripts": {
    "dev": "vite",
    "build": "tsc && vite build",
    "lint": "eslint . --ext ts,tsx --report-unused-disable-directives --max-warnings 0",
    "preview": "vite preview"
  },
  "dependencies": {
    "react": "^18.2.0",
    "react-dom": "^18.2.0"
  },
  "devDependencies": {
    "@testing-library/jest-dom": "^6.1.4",
    "@testing-library/react": "^14.1.2",
    "@testing-library/user-event": "^14.5.1",
    "@types/jest": "^29.5.10",
    "@types/react": "^18.2.37",
    "@types/react-dom": "^18.2.15",
    "@typescript-eslint/eslint-plugin": "^6.10.0",
    "@typescript-eslint/parser": "^6.10.0",
    "@vitejs/plugin-react": "^4.2.0",
    "eslint": "^8.53.0",
    "eslint-plugin-react-hooks": "^4.6.0",
    "eslint-plugin-react-refresh": "^0.4.4",
    "jest": "^29.7.0",
    "jest-environment-jsdom": "^29.7.0",
    "ts-jest": "^29.1.1",
    "ts-node": "^10.9.1",
    "typescript": "^5.2.2",
    "vite": "^5.0.0"
  }
}
  • jest.config.ts
import type { Config } from 'jest';

export default async (): Promise<Config> => {
  return {
    // verbose: true,
    // roots: ['<rootDir>/src'], // , '<rootDir>/test'],
    // testMatch: ['**/__tests__/**/*.+(ts|tsx|js)', '**/?(*.)+(spec|test).+(ts|tsx|js)'],
    testEnvironment: 'jsdom',
    transform: {
      '^.+\\.(ts|tsx|js|jsx)$': 'ts-jest',
    },
    setupFilesAfterEnv: [
      // '@testing-library/jest-dom',
      // "@testing-library/jest-dom/extend-expect",
      '<rootDir>/jest.setup.ts'
    ],
  };
};
  • tsconfig.json
{
  "compilerOptions": {
    "target": "ES2020",
    "useDefineForClassFields": true,
    "lib": ["ES2020", "DOM", "DOM.Iterable"],
    "module": "ESNext",
    "skipLibCheck": true,

    /* Bundler mode */
    "moduleResolution": "bundler",
    "allowImportingTsExtensions": true,
    "resolveJsonModule": true,
    "isolatedModules": true,
    "noEmit": true,
    "jsx": "react-jsx",

    /* Linting */
    "strict": true,
    "noUnusedLocals": true,
    "noUnusedParameters": true,
    "noFallthroughCasesInSwitch": true
  },
  "include": ["src", "Globals.d.ts"],
  "references": [{ "path": "./tsconfig.node.json" }]
}
  • 文件夹结构和图像


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