I'm having a problem with ng test and Angular v21

### Which @angular/* package(s) are the source of the bug?

Don't known / other

### Is this a regression?

No

### Description

Let me explain my problem. I'm trying to run tests using ng test, but I don't know why it suddenly closes the terminal and I don't get any errors. If I run pnpm run test or pnpm test using pnpm run test, I get these errors:

ELIFECYCLE Test failed. See above for more details.

I've searched on Google but haven't found anything about this issue.

I'm using a Windows environment.

### Please provide a link to a minimal reproduction of the bug

_No response_

### Please provide the exception or error you saw

```true
When I launch ng test, my terminal immediately shuts down. But if I run it via `pnpm run test`, I get this error ELIFECYCLE Test failed. See above for more details.
```

### Please provide the environment you discovered this bug in (run `ng version`)

```true
Angular CLI : 21.0.1
Angular : 21.0.1
Node.js : 24.11.1
Package Manager : pnpm 10.24.0
Operating System : win32 x64

┌───────────────────────────┬───────────────────┬───────────────────┐
│ Package │ Installed Version │ Requested Version │
├───────────────────────────┼───────────────────┼───────────────────┤
│ @angular/build │ 21.0.1 │ ^21.0.1 │
│ @angular/cli │ 21.0.1 │ ^21.0.1 │
│ @angular/common │ 21.0.1 │ ^21.0.0 │
│ @angular/compiler │ 21.0.1 │ ^21.0.0 │
│ @angular/compiler-cli │ 21.0.1 │ ^21.0.0 │
│ @angular/core │ 21.0.1 │ ^21.0.0 │
│ @angular/forms │ 21.0.1 │ ^21.0.0 │
│ @angular/platform-browser │ 21.0.1 │ ^21.0.0 │
│ @angular/router │ 21.0.1 │ ^21.0.0 │
│ rxjs │ 7.8.2 │ ~7.8.0 │
│ typescript │ 5.9.3 │ ~5.9.2 │
│ vitest │ 4.0.14 │ ^4.0.8 │
└───────────────────────────┴───────────────────┴───────────────────┘
```

### Anything else?

まず、報告された Windows、Angular CLI 21.0.1、Node.js 24.11.1、pnpm 10.24.0 の環境で `ng test` と `pnpm run test` を実行して失敗を再現します。2 つのコマンド経路を比較し、根本のエラーを取得します。テストコマンドがターミナルを閉じずに有用な失敗を報告すれば完了です。

索引モデルが issue の本文から書いたものです。