Improve test (#13641)

jest.config.mjs

@@ -15,12 +15,15 @@ const SKIP_TESTS_WITH_NEW_SYNTAX = process.versions.node.startsWith("14.");
 let PRETTIER_DIR = isProduction
   ? path.join(PROJECT_ROOT, "dist")
   : PROJECT_ROOT;
+let PRETTIER_INSTALLED_DIR = "";
 if (
   INSTALL_PACKAGE ||
   (isProduction && !TEST_STANDALONE && !SKIP_PRODUCTION_INSTALL)
 ) {
-  PRETTIER_DIR = installPrettier(PRETTIER_DIR);
+  PRETTIER_INSTALLED_DIR = installPrettier(PRETTIER_DIR);
+  PRETTIER_DIR = path.join(PRETTIER_INSTALLED_DIR, "node_modules/prettier");
 }
+process.env.PRETTIER_INSTALLED_DIR = PRETTIER_INSTALLED_DIR;
 process.env.PRETTIER_DIR = PRETTIER_DIR;
 
 const testPathIgnorePatterns = [];

tests/config/get-prettier.js

@@ -7,6 +7,14 @@ function getPrettierInternal() {
     return import(entry).then((module) => module.default);
   }
 
+  const { PRETTIER_INSTALLED_DIR } = process.env;
+
+  if (PRETTIER_INSTALLED_DIR) {
+    return import(
+      pathToFileURL(path.join(PRETTIER_INSTALLED_DIR, "index-proxy.mjs"))
+    );
+  }
+
   const entry = pathToFileURL(
     path.join(
       process.env.PRETTIER_DIR,

tests/config/install-prettier.js

@@ -2,7 +2,7 @@ import path from "node:path";
 import fs from "node:fs";
 import { outdent } from "outdent";
 import { execaSync } from "execa";
-import { temporaryDirectory as getTemporaryDirectory } from "tempy";
+import { temporaryDirectory as createTemporaryDirectory } from "tempy";
 import chalk from "chalk";
 
 const allowedClients = new Set(["yarn", "npm", "pnpm"]);
@@ -38,18 +38,19 @@ function cleanUp() {
   }
 }
 
-function installPrettier(packageDir) {
-  const tmpDir = getTemporaryDirectory();
-  directoriesToClean.add(tmpDir);
+function installPrettier(packageDirectory) {
+  const temporaryDirectory = createTemporaryDirectory();
+  directoriesToClean.add(temporaryDirectory);
   const fileName = execaSync("npm", ["pack"], {
-    cwd: packageDir,
+    cwd: packageDirectory,
   }).stdout.trim();
-  const file = path.join(packageDir, fileName);
-  const packed = path.join(tmpDir, fileName);
+  const file = path.join(packageDirectory, fileName);
+  const packed = path.join(temporaryDirectory, fileName);
   fs.copyFileSync(file, packed);
   fs.unlinkSync(file);
 
-  const runNpmClient = (args) => execaSync(client, args, { cwd: tmpDir });
+  const runNpmClient = (args) =>
+    execaSync(client, args, { cwd: temporaryDirectory });
 
   runNpmClient(client === "pnpm" ? ["init"] : ["init", "-y"]);
 
@@ -71,19 +72,23 @@ function installPrettier(packageDir) {
 
   fs.unlinkSync(packed);
 
-  const installed = path.join(tmpDir, "node_modules/prettier");
   console.log(
     chalk.green(
       outdent`
         Prettier installed
-          at ${chalk.inverse(installed)}
-          from ${chalk.inverse(packageDir)}
+          at ${chalk.inverse(temporaryDirectory)}
+          from ${chalk.inverse(packageDirectory)}
           with ${chalk.inverse(client)}.
       `
     )
   );
 
-  return installed;
+  fs.writeFileSync(
+    path.join(temporaryDirectory, "index-proxy.mjs"),
+    "export * from 'prettier';"
+  );
+
+  return temporaryDirectory;
 }
 
 export default installPrettier;