Don't chdir when run tests

package.json

@@ -143,7 +143,7 @@
   },
   "scripts": {
     "prepublishOnly": "echo \"Error: must publish from dist/\" && exit 1",
-    "test": "cross-env NODE_OPTIONS=--experimental-vm-modules jest --runInBand",
+    "test": "cross-env NODE_OPTIONS=--experimental-vm-modules jest",
     "test:dev-package": "cross-env INSTALL_PACKAGE=1 yarn test",
     "test:dist": "cross-env NODE_ENV=production yarn test",
     "test:dist-standalone": "cross-env TEST_STANDALONE=1 yarn test:dist",

src/cli/format.js

@@ -367,7 +367,7 @@ async function formatFiles(context) {
 
     let input;
     try {
-      input = await fs.readFile(filename, "utf8");
+      input = await fs.readFile(path.join(process.cwd(), filename), "utf8");
     } catch (error) {
       // Add newline to split errors from filename line.
       /* istanbul ignore next */

tests/integration/cli-worker.js

@@ -5,8 +5,14 @@ import url from "node:url";
 import { cosmiconfig } from "cosmiconfig";
 import { prettierCli, thirdParty as thirdPartyModuleFile } from "./env.js";
 
+const INTEGRATION_TEST_DIRECTORY = url.fileURLToPath(
+  new URL("./", import.meta.url)
+);
+
 async function run() {
-  const { options } = workerData;
+  let { dir, options } = workerData;
+
+  dir = path.resolve(INTEGRATION_TEST_DIRECTORY, dir);
 
   Date.now = () => 0;
   // eslint-disable-next-line require-await
@@ -35,6 +41,10 @@ async function run() {
 
   process.stdin.isTTY = Boolean(options.isTTY);
   process.stdout.isTTY = Boolean(options.stdoutIsTTY);
+  process.cwd = () => dir;
+  process.chdir = () => {
+    throw new Error("Can't call `process.chdir()` in worker.")
+  };
 
   const { default: thirdParty } = await import(
     url.pathToFileURL(thirdPartyModuleFile)

tests/integration/run-prettier.js

@@ -1,11 +1,6 @@
-import path from "node:path";
-import url from "node:url";
 import { Worker } from "node:worker_threads";
 
 const CLI_WORKER_FILE = new URL("./cli-worker.js", import.meta.url);
-const INTEGRATION_TEST_DIRECTORY = url.fileURLToPath(
-  new URL("./", import.meta.url)
-);
 
 const streamToString = (stream) =>
   new Promise((resolve, reject) => {
@@ -70,19 +65,10 @@ function runCliWorker(dir, args, options) {
   });
 }
 
-async function run(dir, args, options) {
-  dir = path.resolve(INTEGRATION_TEST_DIRECTORY, dir);
+function run(dir, args, options) {
   args = Array.isArray(args) ? args : [args];
 
-  // Worker doesn't support `chdir`
-  const cwd = process.cwd();
-  process.chdir(dir);
-
-  try {
-    return await runCliWorker(dir, args, options);
-  } finally {
-    process.chdir(cwd);
-  }
+  return runCliWorker(dir, args, options);
 }
 
 let runningCli;