fix: use Vitest for unit testing, clean regex bug (#8040)

.eslintrc.cjs

@@ -63,7 +63,7 @@ module.exports = defineConfig({
     'node/no-extraneous-import': [
       'error',
       {
-        allowModules: ['vite', 'less', 'sass']
+        allowModules: ['vite', 'less', 'sass', 'vitest']
       }
     ],
     'node/no-extraneous-require': [
@@ -103,7 +103,7 @@ module.exports = defineConfig({
       }
     },
     {
-      files: ['packages/vite/types/**'],
+      files: ['packages/vite/types/**', '*.spec.ts'],
       rules: {
         'node/no-extraneous-import': 'off'
       }

.github/workflows/ci.yml

@@ -66,6 +66,9 @@ jobs:
       - name: Build plugin-react
         run: pnpm run build-plugin-react
 
+      - name: Test unit
+        run: pnpm run test-unit
+
       - name: Test serve
         run: pnpm run test-serve -- --runInBand
 

CONTRIBUTING.md

@@ -67,13 +67,15 @@ And re-run `pnpm install` to link the package.
 
 ## Running Tests
 
+### Integration Tests
+
 Each package under `packages/playground/` contains a `__tests__` directory. The tests are run using [Jest](https://jestjs.io/) + [Playwright](https://playwright.dev/) with custom integrations to make writing tests simple. The detailed setup is inside `jest.config.js` and `scripts/jest*` files.
 
 Before running the tests, make sure that [Vite has been built](#repo-setup). On Windows, you may want to [activate Developer Mode](https://docs.microsoft.com/en-us/windows/apps/get-started/enable-your-device-for-development) to solve [issues with symlink creation for non-admins](https://github.com/vitejs/vite/issues/7390). Also you may want to [set git `core.symlinks` to `true` to solve issues with symlinks in git](https://github.com/vitejs/vite/issues/5242).
 
-Each test can be run under either dev server mode or build mode.
+Each integration test can be run under either dev server mode or build mode.
 
-- `pnpm test` by default runs every test in both serve and build mode.
+- `pnpm test` by default runs every integration test in both serve and build mode, and also unit tests.
 
 - `pnpm run test-serve` runs tests only under serve mode. This is just calling `jest` so you can pass any Jest flags to this command. Since Jest will attempt to run tests in parallel, if your machine has many cores this may cause flaky test failures with multiple Playwright instances running at the same time. You can force the tests to run in series with `pnpm run test-serve -- --runInBand`.
 
@@ -83,6 +85,14 @@ Each test can be run under either dev server mode or build mode.
 
   Note package matching is not available for the `pnpm test` script, which always runs all tests.
 
+### Unit Tests
+
+Other than tests under `packages/playground/` for integration tests, packages might contains unit tests under their `__tests__` directory. Unit tests are powered by [Vitest](https://vitest.dev/). The detailed config is inside `vitest.config.ts` files.
+
+- `pnpm run test-unit` runs unit tests under each package.
+
+- You can also use `pnpm run test-unit -- [match]` to run related tests.
+
 ### Test Env and Helpers
 
 Inside playground tests, a global `page` object is automatically available, which is a Playwright [`Page`](https://playwright.dev/docs/api/class-page) instance that has already navigated to the served page of the current playground. So writing a test is as simple as:

jest.config.ts

@@ -3,9 +3,7 @@ import type { Config } from '@jest/types'
 
 const config: Config.InitialOptions = {
   preset: 'ts-jest',
-  testMatch: process.env.VITE_TEST_BUILD
-    ? ['**/playground/**/*.spec.[jt]s?(x)']
-    : ['**/*.spec.[jt]s?(x)'],
+  testMatch: ['**/playground/**/*.spec.[jt]s?(x)'],
   testTimeout: process.env.CI ? 50000 : 20000,
   globalSetup: './scripts/jestGlobalSetup.cjs',
   globalTeardown: './scripts/jestGlobalTeardown.cjs',

package.json

@@ -16,10 +16,11 @@
     "preinstall": "npx only-allow pnpm",
     "format": "prettier --write .",
     "lint": "eslint packages/*/{src,types}/**",
-    "test": "run-s test-serve test-build",
+    "test": "run-s test-serve test-build test-unit",
     "test-serve": "jest",
-    "debug-serve": "cross-env VITE_DEBUG_SERVE=1 node --inspect-brk ./node_modules/.bin/jest",
     "test-build": "cross-env VITE_TEST_BUILD=1 jest",
+    "test-unit": "vitest run",
+    "debug-serve": "cross-env VITE_DEBUG_SERVE=1 node --inspect-brk ./node_modules/.bin/jest",
     "debug-build": "cross-env VITE_TEST_BUILD=1 VITE_PRESERVE_BUILD_ARTIFACTS=1 node --inspect-brk ./node_modules/.bin/jest",
     "docs": "vitepress dev docs",
     "build-docs": "vitepress build docs",
@@ -68,7 +69,8 @@
     "ts-node": "^10.4.0",
     "typescript": "~4.5.4",
     "vite": "workspace:*",
-    "vitepress": "^0.22.3"
+    "vitepress": "^0.22.3",
+    "vitest": "^0.10.4"
   },
   "simple-git-hooks": {
     "pre-commit": "pnpm exec lint-staged --concurrent false",

packages/create-vite/__tests__/cli.spec.ts

@@ -3,6 +3,7 @@ import type { ExecaSyncReturnValue, SyncOptions } from 'execa'
 import { commandSync } from 'execa'
 import { mkdirpSync, readdirSync, remove, writeFileSync } from 'fs-extra'
 import { join } from 'path'
+import { test, expect, beforeAll, afterEach } from 'vitest'
 
 const CLI_PATH = join(__dirname, '..')
 

packages/plugin-react/src/jsx-runtime/babel-restore-jsx.spec.ts

@@ -1,5 +1,6 @@
 import babelRestoreJSX from './babel-restore-jsx'
 import * as babel from '@babel/core'
+import { describe, it, expect } from 'vitest'
 
 function jsx(code: string) {
   return babel.transform(code, {

packages/plugin-react/src/jsx-runtime/restore-jsx.spec.ts

@@ -1,5 +1,6 @@
 import { restoreJSX } from './restore-jsx'
 import * as babel from '@babel/core'
+import { describe, it, expect } from 'vitest'
 
 async function jsx(sourceCode: string) {
   const [ast] = await restoreJSX(babel, sourceCode, 'test.js')

packages/vite/src/node/__tests__/asset.spec.ts

@@ -1,3 +1,4 @@
+import { describe, test, expect } from 'vitest'
 import { assetFileNamesToFileName, getAssetHash } from '../plugins/asset'
 
 describe('getAssetHash', () => {

packages/vite/src/node/__tests__/build.spec.ts

@@ -1,6 +1,7 @@
 import type { LibraryFormats, LibraryOptions } from '../build'
 import { resolveLibFilename } from '../build'
 import { resolve } from 'path'
+import { describe, test, expect } from 'vitest'
 
 type FormatsToFileNames = [LibraryFormats, string][]
 const baseLibOptions: LibraryOptions = {

packages/vite/src/node/__tests__/config.spec.ts

@@ -1,6 +1,7 @@
 import type { InlineConfig } from '..'
 import type { UserConfigExport, UserConfig } from '../config'
 import { mergeConfig, resolveConfig, resolveEnvPrefix } from '../config'
+import { describe, test, expect } from 'vitest'
 
 describe('mergeConfig', () => {
   test('handles configs with different alias schemas', () => {

packages/vite/src/node/__tests__/dev.spec.ts

@@ -1,4 +1,5 @@
 import { resolveConfig } from '..'
+import { describe, test, expect } from 'vitest'
 
 describe('resolveBuildOptions in dev', () => {
   test('build.rollupOptions should not have input in lib', async () => {

packages/vite/src/node/__tests__/plugins/css.spec.ts

@@ -2,6 +2,7 @@ import { cssUrlRE, cssPlugin, hoistAtRules } from '../../plugins/css'
 import { resolveConfig } from '../../config'
 import fs from 'fs'
 import path from 'path'
+import { describe, vi, test, expect } from 'vitest'
 
 describe('search css url function', () => {
   test('some spaces before it', () => {
@@ -69,7 +70,7 @@ describe('css path resolutions', () => {
 
     await buildStart.call({})
 
-    const mockFs = jest
+    const mockFs = vi
       .spyOn(fs, 'readFile')
       // @ts-ignore jest.spyOn not recognize overrided `fs.readFile` definition.
       .mockImplementationOnce((p, encoding, callback) => {

packages/vite/src/node/__tests__/plugins/define.spec.ts

@@ -1,3 +1,4 @@
+import { describe, test, expect } from 'vitest'
 import { definePlugin } from '../../plugins/define'
 import { resolveConfig } from '../../config'
 

packages/vite/src/node/__tests__/plugins/import.spec.ts

@@ -1,3 +1,4 @@
+import { describe, test, expect } from 'vitest'
 import { transformCjsImport } from '../../plugins/importAnalysis'
 
 describe('transformCjsImport', () => {

packages/vite/src/node/__tests__/scan.spec.ts

@@ -1,5 +1,6 @@
 import { scriptRE, commentRE, importsRE } from '../optimizer/scan'
 import { multilineCommentsRE, singlelineCommentsRE } from '../utils'
+import { describe, test, expect } from 'vitest'
 
 describe('optimizer-scan:script-test', () => {
   const scriptContent = `import { defineComponent } from 'vue'

packages/vite/src/node/__tests__/utils.spec.ts

@@ -4,6 +4,7 @@ import {
   isWindows,
   resolveHostname
 } from '../utils'
+import { describe, test, expect } from 'vitest'
 
 describe('injectQuery', () => {
   if (isWindows) {

packages/vite/src/node/cleanString.ts

@@ -5,6 +5,7 @@ import { multilineCommentsRE, singlelineCommentsRE } from './utils'
 // /`([^`\$\{\}]|\$\{(`|\g<1>)*\})*`/g can match nested string template
 // but js not support match expression(\g<0>). so clean string template(`...`) in other ways.
 const stringsRE = /"([^"\r\n]|(?<=\\)")*"|'([^'\r\n]|(?<=\\)')*'/g
+const regexRE = /\/.*?(?<!\\)\/[gimsuy]*/g
 const cleanerRE = new RegExp(
   `${stringsRE.source}|${multilineCommentsRE.source}|${singlelineCommentsRE.source}`,
   'g'
@@ -15,9 +16,11 @@ const stringBlankReplacer = (s: string) =>
   `${s[0]}${'\0'.repeat(s.length - 2)}${s[0]}`
 
 export function emptyString(raw: string): string {
-  let res = raw.replace(cleanerRE, (s: string) =>
-    s[0] === '/' ? blankReplacer(s) : stringBlankReplacer(s)
-  )
+  let res = raw
+    .replace(cleanerRE, (s: string) =>
+      s[0] === '/' ? blankReplacer(s) : stringBlankReplacer(s)
+    )
+    .replace(regexRE, (s) => stringBlankReplacer(s))
 
   let lastEnd = 0
   let start = 0

packages/vite/src/node/server/__tests__/pluginContainer.spec.ts

@@ -4,6 +4,7 @@ import type { Plugin } from '../../plugin'
 import { ModuleGraph } from '../moduleGraph'
 import type { PluginContainer } from '../pluginContainer'
 import { createPluginContainer } from '../pluginContainer'
+import { describe, it, expect, beforeEach } from 'vitest'
 
 let resolveId: (id: string) => any
 let moduleGraph: ModuleGraph

packages/vite/src/node/server/__tests__/search-root.spec.ts

@@ -1,5 +1,6 @@
 import { searchForWorkspaceRoot } from '../searchRoot'
 import { resolve } from 'path'
+import { describe, test, expect } from 'vitest'
 
 describe('searchForWorkspaceRoot', () => {
   test('lerna', () => {

packages/vite/src/node/ssr/__tests__/ssrExternal.spec.ts

@@ -1,4 +1,5 @@
 import { stripNesting } from '../ssrExternal'
+import { test, expect } from 'vitest'
 
 test('stripNesting', async () => {
   expect(stripNesting(['c', 'p1>c1', 'p2 > c2'])).toEqual(['c', 'c1', 'c2'])

packages/vite/src/node/ssr/__tests__/ssrModuleLoader.spec.ts

@@ -1,12 +1,13 @@
 import { resolve } from 'path'
 import { createServer } from '../../index'
+import { test, vi, expect } from 'vitest'
 
 const badjs = resolve(__dirname, './fixtures/ssrModuleLoader-bad.js')
 const THROW_MESSAGE = 'it is an expected error'
 
 test('always throw error when evaluating an wrong SSR module', async () => {
   const viteServer = await createServer()
-  const spy = jest.spyOn(console, 'error').mockImplementation(() => {})
+  const spy = vi.spyOn(console, 'error').mockImplementation(() => {})
   const expectedErrors = []
   for (const i of [0, 1]) {
     try {

packages/vite/src/node/ssr/__tests__/ssrTransform.spec.ts

@@ -1,6 +1,7 @@
 import { transformWithEsbuild } from '../../plugins/esbuild'
 import { traverseHtml } from '../../plugins/html'
 import { ssrTransform } from '../ssrTransform'
+import { test, expect } from 'vitest'
 
 test('default import', async () => {
   expect(