Using overrideComponent breaks code coverage when testing with aot: true

Reproduisez le problème dans l’application générée à l’aide de angular.json, app.spec.ts, TestBed.overrideComponent et des commandes fournies ng test --no-watch --code-coverage. Comparez la couverture avant et après l’override, puis suivez les points d’entrée des tests Angular CLI et de la couverture AOT. C’est terminé lorsque l’override ne rend plus la couverture du template du composant inexacte.

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

When using TestBed.overrideComponent to stub a child component, the test code coverage is no longer accurate

Minimal Reproduction

Generate a new app with latest CLI and add a component:

npx @angular/cli@20.0.0-next.6 new aot-coverage --defaults --no-routing
cd aot-coverage
ng g c user

Use app-user in app.html:

<h1>Hello, aot-coverage</h1>
<app-user></app-user>

Edit angular.json to add "aot": true in the test section and run:

ng test --no-watch --code-coverage

Coverage is 100%

Statements   : 100% ( 12/12 )
Branches     : 100% ( 11/11 )
Functions    : 100% ( 3/3 )
Lines        : 100% ( 6/6 )

Now, in the app.spec.ts, add in beforeEach:

TestBed.overrideComponent(App, {
  remove: {
    imports: [User],
  },
  add: {
    imports: [User],
  }
});

(this happens with a proper stub of course but even removing the import and adding it back works to reproduce the issue)

Run the tests again:

ng test --no-watch --code-coverage

Coverage is now inaccurate because the template is not properly covered:

Statements   : 58.33% ( 7/12 )
Branches     : 90.9% ( 10/11 )
Functions    : 66.66% ( 2/3 )
Lines        : 66.66% ( 4/6 )

Exception or Error

Your Environment

Angular CLI: 20.0.0-next.6
Node: 22.14.0
Package Manager: npm 10.9.0
OS: darwin arm64

Angular: 20.0.0-next.7
... common, compiler, compiler-cli, core, forms
... platform-browser, router

Package                      Version
------------------------------------------------------
@angular-devkit/architect    0.2000.0-next.6
@angular-devkit/core         20.0.0-next.6
@angular-devkit/schematics   20.0.0-next.6
@angular/build               20.0.0-next.6
@angular/cli                 20.0.0-next.6
@schematics/angular          20.0.0-next.6
rxjs                         7.8.2
typescript                   5.8.3
zone.js                      0.15.0

Anything else relevant?

No response