New project tests fail

[klofi]

Command

test

Is this a regression?

• Yes, this behavior used to work in the previous version

The previous version in which this bug was not present was

No response

Description

Running ng test in brand new project made via angular-cli v21.0.2 fails on error Error: Cannot find module '/src/app/app.spec.ts'.

Minimal Reproduction

Repro in Terminal (Windows 11):

ng new angular21dot0dot2 --ssr=false --style=scss --ai-config=none
cd angular21dot0dot2
ng test

Exception or Error

⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯ Failed Suites 1 ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯

 FAIL   angular21dot0dot2  src/app/app.spec.ts [ src/app/app.spec.ts ]
Error: Cannot find module '/src/app/app.spec.ts'

Your Environment

Angular CLI       : 21.0.2
Node.js           : 22.21.1
Package Manager   : npm 10.9.4
Operating System  : win32 x64

Anything else relevant?

No response

[alan-agius4]

I suspect the issue is related to the specific drive letter or volume name. While replication attempts on the C:\ drive failed to reproduce the error, it's important to note that our standard E2E tests are run on D:\.

[klofi]

I can confirm running on D: drive does not fail. Though it took 3 runs, before the test gave any result:

The W: drive is working fine with the Karma runner (ng new angular21dot0dot2 --ssr=false --style=scss --ai-config=none --test-runner=karma), so it's still a regression with the new Vitest runner. The W: drive is mounted via entry in HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\DOS Devices (aka permanent SUBST).

[dreamhelg]

I confirm this behavior. There is a problem on Windows, when trying to run unit tests in a project which location is different from drive C: I have a two different drives HDD E: and SSD F: both not working. Sometimes, it's just terminal with success build and nothing more:

Sometimes, terminal print this error:

These errors happens on a new generated project, and also on migrated project too.
Running tests in drive C: is successful.

Windows 10 Pro
Node 24.8.0
Angular CLI 21.0.4

[alan-agius4]

Closed via #32205

[klofi]

Can confirm this works now, thank you! 👍

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