describe("correct behavior", () => { test("lengths", () => { expect(Object.values).toHaveLength(1); expect(Object.values(true)).toHaveLength(0); expect(Object.values(45)).toHaveLength(0); expect(Object.values(-998)).toHaveLength(0); expect(Object.values("abcd")).toHaveLength(4); expect(Object.values([1, 2, 3])).toHaveLength(3); expect(Object.values({ a: 1, b: 2, c: 3 })).toHaveLength(3); }); test("object argument", () => { let values = Object.values({ foo: 1, bar: 2, baz: 3 }); expect(values).toEqual([1, 2, 3]); }); test("object argument with symbol keys", () => { let values = Object.values({ foo: 1, [Symbol("bar")]: 2, baz: 3 }); expect(values).toEqual([1, 3]); }); test("array argument", () => { let values = Object.values(["a", "b", "c"]); expect(values).toEqual(["a", "b", "c"]); }); test("ignores non-enumerable properties", () => { let obj = { foo: 1 }; Object.defineProperty(obj, "getFoo", { value: function () { return this.foo; }, }); let values = Object.values(obj); expect(values).toEqual([1]); }); }); describe("errors", () => { test("null argument", () => { expect(() => { Object.values(null); }).toThrowWithMessage(TypeError, "ToObject on null or undefined"); }); test("undefined argument", () => { expect(() => { Object.values(undefined); }).toThrowWithMessage(TypeError, "ToObject on null or undefined"); }); });