text: describe("for of object", () => {
      it("should iterate key", () => {
          const person = {
              name: "Lydia",
              age: 21
          };
  
          const res = [];
          for (const item in person) {
              res.push(item);
          }
          expect(res).toEqual(["name", "age"]);
      });
  });
  