82 lines
2.6 KiB
JavaScript
82 lines
2.6 KiB
JavaScript
test("length is 3", () => {
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expect(Reflect.defineProperty).toHaveLength(3);
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});
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describe("errors", () => {
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test("target must be an object", () => {
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[null, undefined, "foo", 123, NaN, Infinity].forEach(value => {
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expect(() => {
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Reflect.defineProperty(value);
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}).toThrowWithMessage(
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TypeError,
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"First argument of Reflect.defineProperty() must be an object"
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);
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});
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});
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test("descriptor must be an object", () => {
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[null, undefined, "foo", 123, NaN, Infinity].forEach(value => {
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expect(() => {
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Reflect.defineProperty({}, "foo", value);
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}).toThrowWithMessage(TypeError, "Descriptor argument is not an object");
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});
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});
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});
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describe("normal behavior", () => {
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test("initial value and non-writable", () => {
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var o = {};
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expect(o.foo).toBeUndefined();
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expect(Reflect.defineProperty(o, "foo", { value: 1, writable: false })).toBeTrue();
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expect(o.foo).toBe(1);
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o.foo = 2;
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expect(o.foo).toBe(1);
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});
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test("initial value and writable", () => {
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var o = {};
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expect(o.foo).toBeUndefined();
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expect(Reflect.defineProperty(o, "foo", { value: 1, writable: true })).toBeTrue();
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expect(o.foo).toBe(1);
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o.foo = 2;
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expect(o.foo).toBe(2);
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});
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test("can redefine value of configurable, writable property", () => {
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var o = {};
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expect(o.foo).toBeUndefined();
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expect(
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Reflect.defineProperty(o, "foo", { value: 1, configurable: true, writable: true })
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).toBeTrue();
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expect(o.foo).toBe(1);
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expect(Reflect.defineProperty(o, "foo", { value: 2 })).toBeTrue();
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expect(o.foo).toBe(2);
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});
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test("can redefine value of configurable, non-writable property", () => {
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var o = {};
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expect(o.foo).toBeUndefined();
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expect(
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Reflect.defineProperty(o, "foo", { value: 1, configurable: true, writable: false })
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).toBeTrue();
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expect(o.foo).toBe(1);
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expect(Reflect.defineProperty(o, "foo", { value: 2 })).toBeTrue();
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expect(o.foo).toBe(2);
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});
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test("cannot redefine value of non-configurable, non-writable property", () => {
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var o = {};
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expect(o.foo).toBeUndefined();
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expect(
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Reflect.defineProperty(o, "foo", { value: 1, configurable: false, writable: false })
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).toBeTrue();
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expect(o.foo).toBe(1);
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expect(Reflect.defineProperty(o, "foo", { value: 2 })).toBeFalse();
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expect(o.foo).toBe(1);
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});
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});
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