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Unhandled promise rejections aren't properly reported in tests #30861

Open
@sgravrock

Description

Which @angular/* package(s) are the source of the bug?

Don't known / other

Is this a regression?

Yes

Description

In an Angular project that uses zone.js, unhandled promise rejections are not reported. In a zoneless Angular project, they are reported twice.

Steps to reproduce:

  1. Create a new Angular project.
  2. Paste the code below into a spec file.
  3. npm t
it('triggers an unhandled rejection', function(done) {
	Promise.reject(new Error('nope'));
	// Make sure the unhandled rejection event has plenty of time to fire before
	// Jasmine finishes running. This helps distinguish between timing issues
	// (event is firing a bit later than usual) and the event not firing at all.
	setTimeout(done, 1000);
});

Expected result: The spec should fail with a single "Unhandled promise
rejection: Error: nope" error.

Observed:

  • If the project was set up zoneless, the spec fails with two copies of the expected error.
  • Otherwise, the spec passes.

Please provide a link to a minimal reproduction of the bug

https://github.com/sgravrock/ng-unhandled-rejection

Please provide the exception or error you saw

Please provide the environment you discovered this bug in (run ng version)

_ _ ____ _ ___
 / \ _ __ __ _ _ _| | __ _ _ __ / ___| | |_ _|
 / しろさんかく \ | '_ \ / _` | | | | |/ _` | '__| | | | | | |
 / ___ \| | | | (_| | |_| | | (_| | | | |___| |___ | |
 /_/ \_\_| |_|\__, |\__,_|_|\__,_|_| \____|_____|___|
 |___/
 
Angular CLI: 20.1.5
Node: 20.19.0
Package Manager: npm 10.8.2
OS: darwin arm64
Angular: 20.1.6
... common, compiler, compiler-cli, core, forms
... platform-browser, router
Package Version
------------------------------------------------------
@angular-devkit/architect 0.2001.5
@angular-devkit/core 20.1.5
@angular-devkit/schematics 20.1.5
@angular/build 20.1.5
@angular/cli 20.1.5
@schematics/angular 20.1.5
rxjs 7.8.2
typescript 5.8.3
zone.js 0.15.1

Anything else?

No response

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