Using overrideComponent breaks code coverage when testing with aot: true

Tái hiện vấn đề trong ứng dụng được tạo bằng cách sử dụng angular.json, app.spec.ts, TestBed.overrideComponent và các lệnh ng test --no-watch --code-coverage được cung cấp. So sánh mức độ bao phủ trước và sau override, sau đó lần theo các điểm đầu vào của quá trình kiểm thử Angular CLI và mức độ bao phủ AOT. Hoàn tất khi override không còn khiến mức độ bao phủ template của component không chính xác.

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