"use strict"; const Base = { }; let called = false; const obj = { get test() { called = true; }, set() { return super.test = 3; }, }; Object.setPrototypeOf(obj, Base); expect(() => { obj.set(); }).toThrow(); expect(called).toBe(false); expect(Base.test).toBeUndefined(); expect(obj.test).toBeUndefined();