Include debug script in test directories

contributing/core/testing.md

@@ -84,7 +84,7 @@ these can be leveraged by prefixing the `pnpm test` command.
 
 - When investigating failures in isolated tests you can use
   `NEXT_TEST_SKIP_CLEANUP=1` to prevent deleting the temp folder created for the test,
-  then you can run `pnpm next` while inside the temp folder to debug the fully set-up test project.
+  then you can run `pnpm debug` while inside the temp folder to debug the fully set-up test project.
 - You can also use `NEXT_SKIP_ISOLATE=1` if the test doesn't need to be installed to debug,
   and it will run inside the Next.js repo instead of the temp directory,
   this can also reduce test times locally but is not compatible with all tests.

test/lib/create-next-install.js

@@ -130,12 +130,18 @@ async function createNextInstall({
         }, {}),
       }
 
+      const scripts = {
+        debug: `NEXT_PRIVATE_SKIP_CANARY_CHECK=1 NEXT_TELEMETRY_DISABLED=1 NEXT_TEST_NATIVE_DIR=${process.env.NEXT_TEST_NATIVE_DIR} node --inspect --trace-deprecation --enable-source-maps node_modules/next/dist/bin/next`,
+        ...packageJson.scripts,
+      }
+
       await fs.ensureDir(installDir)
       await fs.writeFile(
         path.join(installDir, 'package.json'),
         JSON.stringify(
           {
             ...packageJson,
+            scripts,
             dependencies: combinedDependencies,
             private: true,
             // Add resolutions if provided.