我正在从头开始设置一个新项目。该项目使用故事书和笑话进行测试。我在react组件上运行toMatchSnapshot()断言时遇到了一个问题。
这是我的index.test.tsx:
import React from 'react';
import renderer from 'react-test-renderer';
import {Button} from '../index';
it('renders correctly', () => {
const tree = renderer.create(<Button/>).toJSON();
expect(tree).toMatchSnapshot();
});
Myjest.config.ts:
import type {Config} from '@jest/types';
const config: Config.InitialOptions = {
verbose: true,
collectCoverageFrom: [
'src/components/**/*.{ts,tsx}',
],
coverageDirectory: 'reports/coverage/unit',
coverageThreshold: {
global: {
branches: 90,
functions: 90,
lines: 90,
statements: 90,
},
},
transform: {'^.+\.(ts|tsx)$': 'ts-jest'},
testMatch: ['**/*.test.*'],
coverageProvider: 'v8',
};
export default config;
Mytsconfig.json:
{
"compilerOptions": {
"sourceMap": true,
"skipLibCheck": true,
"strict": true,
"forceConsistentCasingInFileNames": true,
"noEmit": true,
"esModuleInterop": true,
"jsx": "preserve",
"baseUrl": "./src",
"paths": {
"@/*": [
"./*"
]
}
},
"exclude": [
"node_modules"
],
"include": [
"**/*.ts",
"**/*.tsx"
]
}
Mypackage.json:
{
"name": "project-name",
"version": "0.1.0",
"private": true,
"scripts": {
"type-check": "tsc",
"lint": "eslint src --ext .tsx",
"lint:fix": "npm run lint -- --fix",
"test": "jest",
"test:watch": "npm run test -- --watch",
"test:coverage": "npm run test -- --coverage",
"storybook": "start-storybook -p 6006",
"build-storybook": "build-storybook"
},
"dependencies": {
"@storybook/react": "^6.3.7",
"bootstrap": "^5.1.0",
"classnames": "^2.3.1",
"prop-types": "^15.7.2",
"react": "^17.0.2",
"react-bootstrap": "^2.0.0-beta.2",
"react-dom": "^17.0.2",
"storybook-addon-responsive-views": "^2.3.0"
},
"devDependencies": {
"@storybook/addon-actions": "^6.3.7",
"@storybook/addon-docs": "^6.3.7",
"@storybook/addon-essentials": "^6.3.7",
"@storybook/addon-links": "^6.3.7",
"@storybook/builder-webpack5": "^6.3.7",
"@storybook/manager-webpack5": "^6.3.7",
"@types/jest": "^27.0.1",
"@types/node": "^16.6.1",
"@types/react": "^17.0.18",
"@types/react-dom": "^17.0.9",
"@types/react-test-renderer": "^17.0.1",
"@typescript-eslint/eslint-plugin": "^4.29.2",
"@typescript-eslint/parser": "^4.29.2",
"eslint": "^7.32.0",
"eslint-config-airbnb": "^18.2.1",
"eslint-plugin-import": "^2.24.0",
"eslint-plugin-jest": "^24.4.0",
"eslint-plugin-jsx-a11y": "^6.4.1",
"eslint-plugin-react": "^7.24.0",
"eslint-plugin-react-hooks": "^4.2.0",
"husky": "^7.0.1",
"jest": "^27.0.6",
"node-sass": "^6.0.1",
"node-sass-magic-importer": "^5.3.2",
"resolve-url-loader": "^4.0.0",
"sass-loader": "^12.1.0",
"ts-jest": "^27.0.5",
"ts-node": "^10.2.0",
"typescript": "^4.3.5"
},
"husky": {
"hooks": {
"pre-commit": "npm run lint"
}
}
}
当我运行测试时，结果如下:
FAIL src/components/buttons/button/__tests__/index.test.tsx
● 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.
• 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:
/Users/marco/Code/project-name/src/components/buttons/button/__tests__/index.test.tsx:19
const tree = react_test_renderer_1.default.create(<index_1.Button />).toJSON();
^
SyntaxError: Unexpected token '<'
at Runtime.createScriptFromCode (node_modules/jest-runtime/build/index.js:1479:14)
Test Suites: 1 failed, 1 total
Tests: 0 total
Snapshots: 0 total
Time: 4.003 s
Ran all test suites.
修复方法很简单。我必须设置" jx "关键在于"反应"。而不是"保存";在tsconfig.json。在这里找到了答案:https://github.com/vercel/next.js/issues/8663