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Importing a recursive cycle of standalone components into TestBed causes an infinite loop #49469

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Importing a recursive cycle of standalone components into TestBed causes an infinite loop#49469
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P3An issue that is relevant to core functions, but does not impede progress. Important, but not urgentarea: coreIssues related to the framework runtimearea: testingIssues related to Angular testing features, such as TestBedcross-cutting: standaloneIssues related to the NgModule-less worldstate: has PR
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@atscott

Description

@atscott
atscott
opened on Mar 17, 2023

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

core

Is this a regression?

No

Description

Importing a recursive cycle of standalone components into TestBed.configureTestingModule causes an infinite loop in queueTypesFromModulesArrayRecur.

Please provide a link to a minimal reproduction of the bug

angular/packages/core/test/acceptance/standalone_spec.ts

Lines 370 to 400 in 8d99ad0

it('should render a recursive cycle of standalone components', () => {
@Component({
selector: 'cmp-a',
standalone: true,
template: '<ng-template [ngIf]="false"><cmp-c></cmp-c></ng-template>A',
imports: [forwardRef(() => StandaloneCmpC)],
})
class StandaloneCmpA {
}
@Component({
selector: 'cmp-b',
standalone: true,
template: '(<cmp-a></cmp-a>)B',
imports: [StandaloneCmpA],
})
class StandaloneCmpB {
}
@Component({
selector: 'cmp-c',
standalone: true,
template: '(<cmp-b></cmp-b>)C',
imports: [StandaloneCmpB],
})
class StandaloneCmpC {
}
const fixture = TestBed.createComponent(StandaloneCmpC);
fixture.detectChanges();
expect(fixture.nativeElement.textContent).toBe('((A)B)C');

Right before the TestBed.createComponent, add TestBed.configureTestingModule({imports: [StandaloneCmpC]});

Please provide the exception or error you saw


    RangeError: Maximum call stack size exceeded

    at queueTypesFromModulesArrayRecur

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    P3An issue that is relevant to core functions, but does not impede progress. Important, but not urgentarea: coreIssues related to the framework runtimearea: testingIssues related to Angular testing features, such as TestBedcross-cutting: standaloneIssues related to the NgModule-less worldstate: has PR

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