@angular/build:unit-test: inject zone.js/testing before karma builder execution #32032
Description
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
The fix made for auto-injecting the zone.js/testing polyfill in the karma builder from #30595 seems to have been accidentally reverted when the karma and vitest runners were refactored back in August, so zone.js + karma apps don't work with the unit-test builder right now unless you make a duplicate build target for the unit-test builder to target instead that specifies the testing polyfill as well.
Minimal Reproduction
Create a minimal zone.js app with a single test that relies on Zone using the "unit-test" karma runner. Run ng test. The test fails because the testing polyfill isn't present.
Exception or Error
Your Environment
_ _ ____ _ ___
/ \ _ __ __ _ _ _| | __ _ _ __ / ___| | |_ _|
/ △ \ | '_ \ / _` | | | | |/ _` | '__| | | | | | |
/ ___ \| | | | (_| | |_| | | (_| | | | |___| |___ | |
/_/ \_\_| |_|\__, |\__,_|_|\__,_|_| \____|_____|___|
|___/
Angular CLI : 21.0.2
Angular : 21.0.3
Node.js : 22.14.0
Package Manager : npm 11.6.2
Operating System : win32 x64
┌───────────────────────────┬───────────────────┬───────────────────┐
│ Package │ Installed Version │ Requested Version │
├───────────────────────────┼───────────────────┼───────────────────┤
│ @angular/build │ 21.0.2 │ ^21.0.2 │
│ @angular/cdk │ 21.0.2 │ ~21.0.2 │
│ @angular/cli │ 21.0.2 │ ~21.0.2 │
│ @angular/common │ 21.0.3 │ ~21.0.3 │
│ @angular/compiler │ 21.0.3 │ ~21.0.3 │
│ @angular/compiler-cli │ 21.0.3 │ ~21.0.3 │
│ @angular/core │ 21.0.3 │ ~21.0.3 │
│ @angular/forms │ 21.0.3 │ ~21.0.3 │
│ @angular/material │ 21.0.2 │ ~21.0.2 │
│ @angular/platform-browser │ 21.0.3 │ ~21.0.3 │
│ @angular/router │ 21.0.3 │ ~21.0.3 │
│ rxjs │ 7.8.2 │ ~7.8.2 │
│ typescript │ 5.9.3 │ ~5.9.3 │
│ zone.js │ 0.16.0 │ ~0.16.0 │
└───────────────────────────┴───────────────────┴───────────────────┘
Anything else relevant?
No response