"use strict"; const Base = { }; let value = 2; const obj = { set test(v) { value = v; }, set() { return super.test = 3; }, }; Object.setPrototypeOf(obj, Base); expect(() => { obj.set(); }).toThrow(); expect(value).toBe(2); expect(Base.test).toBeUndefined(); expect(obj.test).toBeUndefined();