Bug: Angular 19 setInput with InputSignal on test

[handja]

Hi,

I encounter an issue on the angular unit test when I want to set a value to an input.

Inside my component, i've only one input :

export class Component {
  items = input<Item[]>([]);
}

Inside my test I want to set the items value with the setInput() method.
fixture.componentRef.setInput('items', items);

But this issue is encountered when I use this method.

Error: NG0303: Can't set value of the 'items' input on the 'r' component. Make sure that the 'items' property is annotated with @input() or a mapped @input('items') exists.

I'm using :

• ng-mock: 14.13.2
• jasmine: 5.1.4
• Angular: 19

[GipHub123]

@handja Could you provide a complete example of how you set up your test cases?

[handja]

TS File

import { Component, input } from '@angular/core';

@Component({
  selector: 'esac-test',
  template: '',
})
export class TestComponent {
  readonly count = input(0);
}

Spec File

import { TestComponent } from './test.component';
import { MockBuilder, MockRender, MockedComponentFixture } from 'ng-mocks';

fdescribe('TestComponent', () => {
  let component: TestComponent;
  let fixture: MockedComponentFixture<TestComponent>;

  beforeEach(async () => {
    await MockBuilder(TestComponent);
    fixture = MockRender(TestComponent);
    component = fixture.point.componentInstance;
  });

  it('should create', () => {
    fixture.componentRef.setInput('count', 1);
    expect(component).toBeTruthy();
  });
});

[StreetCube]

I'm having the same issue, can't set any of the inputs with ComponentRef.setInput() getting the same error message.

[jeppetn]

We are having same issue, is there a timeline for this?

[JLa2r]

Also experiencing this within my ng-mocks-based tests. Normal jest tests are not a problem.

[cheng93]

workaround has worked for me

import { SIGNAL } from "@angular/core/primitives/signals";

component.items[SIGNAL].applyValueToInputSignal(component.items[SIGNAL], items);

source

https://github.com/angular/angular/blob/main/packages/core/src/render3/apply_value_input_field.ts#L11