enable isolation for all presets

Author: pi0

test/presets/node.test.ts

@@ -1,6 +1,4 @@
 import { existsSync, promises as fsp } from "node:fs";
-import { tmpdir } from "node:os";
-import fse from "fs-extra";
 import { resolve } from "pathe";
 import { describe, it, expect } from "vitest";
 import { isWindows } from "std-env";
@@ -10,14 +8,7 @@ describe("nitro:preset:node", async () => {
   const ctx = await setupTest("node");
 
   testNitro(ctx, async () => {
-    // Copy the server files to an isolated directory from (repo) node_modules
-    const tmpOutputDir = resolve(tmpdir(), "nitro-tests/node");
-    await fsp.rm(tmpOutputDir, { recursive: true }).catch(() => {});
-    await fsp.mkdir(tmpOutputDir, { recursive: true });
-    await fse.copy(resolve(ctx.outDir), tmpOutputDir);
-
-    const entryPath = resolve(tmpOutputDir, "server/index.mjs");
-    // console.log("entry", entryPath);
+    const entryPath = resolve(ctx.outDir, "server/index.mjs");
     const { listener } = await import(entryPath);
 
     await startServer(ctx, listener);

test/tests.ts

@@ -1,5 +1,8 @@
-import { resolve } from "pathe";
+import { tmpdir } from "node:os";
+import { promises as fsp } from "node:fs";
+import { join, resolve } from "pathe";
 import { listen, Listener } from "listhen";
+import fse from "fs-extra";
 import destr from "destr";
 import { fetch, FetchOptions } from "ofetch";
 import { expect, it, afterAll, beforeAll, describe } from "vitest";
@@ -35,16 +38,19 @@ export const describeIf = (condition, title, factory) =>
 
 export async function setupTest(preset: string) {
   const fixtureDir = fileURLToPath(new URL("fixture", import.meta.url).href);
-
-  const presetTempDir = fileURLToPath(
-    new URL(`presets/.tmp/${preset}`, import.meta.url).href
+  const presetTempDir = resolve(
+    process.env.NITRO_TEST_TMP_DIR || join(tmpdir(), "nitro-tests"),
+    preset
   );
 
+  await fsp.rm(presetTempDir, { recursive: true }).catch(() => {});
+  await fsp.mkdir(presetTempDir, { recursive: true });
+
   const ctx: Context = {
     preset,
     isDev: preset === "nitro-dev",
     rootDir: fixtureDir,
-    outDir: resolve(fixtureDir, presetTempDir, ".output"),
+    outDir: resolve(fixtureDir, presetTempDir, "output"),
     fetch: (url, opts) =>
       fetch(joinURL(ctx.server!.url, url.slice(1)), {
         redirect: "manual",