Experimental Jest Testing w/ Libraries

[SunderApps]

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

I am using the experimental Jest support with Angular 19 and am having troubles getting my library tests to run. Tests for a regular app work fine if the libraries are placed in the src folder; otherwise, it will have the same issue. The libraries still fail with that setup.

The issue:
ng test doesn't run and prints the following error for each .spec.ts file in the other libraries

For example, if I run ng test lib, it fails with this error about the app.spec.ts file in the main application, which shouldn't need to be in the TS compilation because I'm running tests for just lib.

X [ERROR] File 'src\app\app.spec.ts' is missing from the TypeScript compilation. [plugin angular-compiler]
Ensure the file is part of the TypeScript program via the 'files' or 'include' property.

For now, I just have my libraries in the src folder, removed testing from the library architects, and just have the main app test the child libraries.

Minimal Reproduction

• npm i -g @angular/cli@19.0.5
• ng new jest-lib-test --routing true --style scss --ssr false
• cd jest-lib-test
• npm r @types/jasmine jasmine-core karma karma-chrome-launcher karma-coverage karma-jasmine karma-jasmine-html-reporter
• npm i -D jest @types/jest jest-preset-angular
• ng g library lib
• Replace jasmine with jest in tsconfig.spec.json and projects/lib/tsconfig.spec.json
• Replace karma with jest in angular.json (both test configs)
• Remove inlineStyleLanguage, assets, styles, and scripts from the app's test config while you're in angular.json
• ng test

Exception or Error

NOTE: The Jest builder is currently EXPERIMENTAL and not ready for production use.
Application bundle generation failed. [1.050 seconds]

X [ERROR] File 'projects\lib\src\lib\lib.service.spec.ts' is missing from the TypeScript compilation. [plugin angular-compiler]     

  Ensure the file is part of the TypeScript program via the 'files' or 'include' property.


X [ERROR] File 'projects\lib\src\lib\lib.component.spec.ts' is missing from the TypeScript compilation. [plugin angular-compiler]   

  Ensure the file is part of the TypeScript program via the 'files' or 'include' property.


NOTE: The Jest builder is currently EXPERIMENTAL and not ready for production use.
Application bundle generation failed. [0.846 seconds]

X [ERROR] File 'src\app\app.component.spec.ts' is missing from the TypeScript compilation. [plugin angular-compiler]

  Ensure the file is part of the TypeScript program via the 'files' or 'include' property.

Your Environment

Angular CLI: 19.2.0
Node: 20.18.0
Package Manager: npm 11.1.0
OS: win32 x64

Angular: 19.2.0
... animations, cli, common, compiler, compiler-cli, core, forms
... platform-browser, platform-browser-dynamic, router

Package                         Version
---------------------------------------------------------
@angular-devkit/architect       0.1902.0
@angular-devkit/build-angular   19.2.0
@angular-devkit/core            19.2.0
@angular-devkit/schematics      19.2.0
@schematics/angular             19.2.0
ng-packagr                      19.2.0
rxjs                            7.8.2
typescript                      5.6.3
zone.js                         0.15.0

Anything else relevant?

On Windows 11

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