Function callback

packages/core/test/authoring/model_input_spec.ts:110–110

()

    const signal1 = TestBed.runInInjectionContext(() => model(0));
    const signal2 = TestBed.runInInjectionContext(() => model(0));
    const callback = () => emitCount++;
    const subscription1 = signal1.subscribe(callback);
    const subscription2 = signal2.subscribe(callback);