Class NoOpValidator

packages/forms/test/template_integration_spec.ts:2449–2466

      let registerOnAsyncValidatorChangeFired = 0;

      @Directive({
        selector: '[ng-noop-validator]',
        providers: [
          {provide: NG_VALIDATORS, useExisting: forwardRef(() => NoOpValidator), multi: true},
        ],
        standalone: false,
      })
      class NoOpValidator implements Validator {
        @Input() validatorInput = '';

        validate(c: AbstractControl) {
          return null;
        }

        public registerOnValidatorChange(fn: () => void) {
          registerOnValidatorChangeFired++;
        }
      }

      @Directive({
        selector: '[ng-noop-async-validator]',