👷(vitest) Move to Vitest (#5350)

**Description**

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Change our test runner to Vitest.

Jest is great but it's partial support for ESM is putting us in
troubles. As such we passed fast-check to Vitest a while ago and want to
unify all others so that we preserve a unique test runner in our CI.

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- [x] Category: 👷 Build tools & CI
- [x] Impacts: Test runner

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<!-- * ✨ Introduce new features -->
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.changeset/seven-owls-hammer.md

@@ -0,0 +1,5 @@
+---
+"@fast-check/vitest": patch
+---
+
+👷(vitest) Move to Vitest

.gitignore

@@ -6,6 +6,7 @@ packages/*/dist/
 packages/*/lib/
 packages/*/lib-*/
 packages/fast-check/docs/
+packages/*/.test-artifacts/
 *.tgz
 deopt.out
 v8.log

packages/vitest/package.json

@@ -28,7 +28,7 @@
     "build:publish-types": "tsc -p tsconfig.publish.types.json && tsc -p tsconfig.publish.types.json --outDir lib/cjs",
     "build:publish-cjs": "tsc -p tsconfig.publish.json --outDir lib/cjs && cp package.cjs-template.json lib/cjs/package.json",
     "build:publish-esm": "tsc -p tsconfig.publish.json --module es2015 --moduleResolution node",
-    "test": "yarn node --experimental-vm-modules $(yarn bin jest)",
+    "test": "vitest",
     "test-bundle": "node test-bundle/basic.mjs && vitest --config test-bundle/vitest.config.mjs",
     "typecheck": "tsc --noEmit"
   },
@@ -50,14 +50,8 @@
     "vitest": ">=0.28.1 <1.0.0 || ^1 || ^2"
   },
   "devDependencies": {
-    "@babel/core": "^7.25.8",
-    "@babel/preset-typescript": "^7.25.7",
-    "@jest/globals": "^29.7.0",
-    "@types/jest": "^29.5.13",
     "@types/node": "^20.14.15",
-    "babel-jest": "^29.7.0",
     "fast-check": "workspace:*",
-    "jest": "^29.7.0",
     "typescript": "~5.6.3",
     "vite": "^5.4.9",
     "vitest": "^2.1.3"

packages/vitest/test/vitest-fast-check.spec.ts

@@ -3,7 +3,7 @@ import * as url from 'url';
 import { promises as fs } from 'fs';
 import { promisify } from 'util';
 import { execFile as _execFile } from 'child_process';
-import { jest } from '@jest/globals';
+import { afterAll, beforeAll, describe, expect, it } from 'vitest';
 
 const execFile = promisify(_execFile);
 // @ts-expect-error --module must be higher
@@ -14,13 +14,11 @@ import type { test as _test, it as _it } from '@fast-check/vitest';
 declare const fc: typeof _fc;
 declare const runner: typeof _test | typeof _it;
 
-const generatedTestsDirectoryName = 'generated-tests';
-const generatedTestsDirectory = path.join(__dirname, generatedTestsDirectoryName);
+const generatedTestsDirectoryName = '.test-artifacts';
+const generatedTestsDirectory = path.join(__dirname, '..', generatedTestsDirectoryName);
 
 type RunnerType = 'test' | 'it';
 
-jest.setTimeout(60_000);
-
 beforeAll(async () => {
   await fs.mkdir(generatedTestsDirectory, { recursive: true });
 });
@@ -220,7 +218,7 @@ async function writeToFile(
 
   // Prepare jest config itself
   const vitestConfigName = `vitest.config-${specFileSeed}.mjs`;
-  const vitestConfigRelativePath = `test/${generatedTestsDirectoryName}/${vitestConfigName}`;
+  const vitestConfigRelativePath = `${generatedTestsDirectoryName}/${vitestConfigName}`;
   const vitestConfigPath = path.join(generatedTestsDirectory, vitestConfigName);
 
   // Write the files
@@ -229,7 +227,7 @@ async function writeToFile(
     fs.writeFile(
       vitestConfigPath,
       `import { defineConfig } from 'vite';\n` +
-        `export default defineConfig({ test: { include: ['test/${generatedTestsDirectoryName}/${specFileName}'], }, });`,
+        `export default defineConfig({ test: { include: ['${generatedTestsDirectoryName}/${specFileName}'], }, });`,
     ),
   ]);
 

packages/vitest/vitest.config.ts

@@ -0,0 +1,8 @@
+import { defineConfig } from 'vitest/config';
+
+export default defineConfig({
+  test: {
+    testTimeout: 60000, // 60s
+    include: ['**/test/*.{test,spec}.?(c|m)[jt]s?(x)'],
+  },
+});

yarn.lock

@@ -3107,14 +3107,8 @@ __metadata:
   version: 0.0.0-use.local
   resolution: "@fast-check/vitest@workspace:packages/vitest"
   dependencies:
-    "@babel/core": "npm:^7.25.8"
-    "@babel/preset-typescript": "npm:^7.25.7"
-    "@jest/globals": "npm:^29.7.0"
-    "@types/jest": "npm:^29.5.13"
     "@types/node": "npm:^20.14.15"
-    babel-jest: "npm:^29.7.0"
     fast-check: "workspace:*"
-    jest: "npm:^29.7.0"
     typescript: "npm:~5.6.3"
     vite: "npm:^5.4.9"
     vitest: "npm:^2.1.3"