Karma builder can't handle multiple spec files with same name with "builderMode: application"

[cexbrayat]

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

This issue is similar to #26810

When a project has several spec files with the same name, the esbuilder outputs them to the same location and crashes.

Minimal Reproduction

Generate a new project with npx @angular/cli@19.0.0-rc.0 new karma-collision --defaults --no-routing.
Add "builderMode": "application", to angular.json in the karma options.
Add a new component with ng g c other/app
Run ng test

Exception or Error

An unhandled exception occurred: /Users/cedric/Code/temp/karma-collision/src/app/app.component.spec.ts and /Users/cedric/Code/temp/karma-collision/src/app/other/app/app.component.spec.ts both output to the same location app.component.spec. Rename or move one of the files to fix the conflict.
See "/private/var/folders/fl/sx8_jbfd1gg3gg04jb0lr_n00000gn/T/ng-m92j7I/angular-errors.log" for further details.

Your Environment

Angular CLI: 19.0.0-rc.0
Node: 20.13.1
Package Manager: npm 9.7.1
OS: darwin arm64

Angular: 19.0.0-rc.0
... animations, cli, common, compiler, compiler-cli, core, forms
... platform-browser, platform-browser-dynamic, router

Package Version

@angular-devkit/architect 0.1900.0-rc.0
@angular-devkit/build-angular 19.0.0-rc.0
@angular-devkit/core 19.0.0-rc.0
@angular-devkit/schematics 19.0.0-rc.0
@schematics/angular 19.0.0-rc.0
rxjs 7.8.1
typescript 5.6.3
zone.js 0.15.0

Anything else relevant?

No response

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