66 lines
2.2 KiB
JavaScript
66 lines
2.2 KiB
JavaScript
test("length is 2", () => {
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expect(Reflect.deleteProperty).toHaveLength(2);
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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.deleteProperty(value);
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}).toThrowWithMessage(
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TypeError,
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"First argument of Reflect.deleteProperty() must be an object"
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);
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});
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});
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});
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describe("normal behavior", () => {
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test("deleting non-existent property", () => {
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expect(Reflect.deleteProperty({})).toBeTrue();
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expect(Reflect.deleteProperty({}, "foo")).toBeTrue();
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});
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test("deleting existent property", () => {
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var o = { foo: 1 };
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expect(o.foo).toBe(1);
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expect(Reflect.deleteProperty(o, "foo")).toBeTrue();
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expect(o.foo).toBeUndefined();
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expect(Reflect.deleteProperty(o, "foo")).toBeTrue();
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expect(o.foo).toBeUndefined();
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});
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test("deleting existent, configurable, non-writable property", () => {
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var o = {};
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Object.defineProperty(o, "foo", { value: 1, configurable: true, writable: false });
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expect(Reflect.deleteProperty(o, "foo")).toBeTrue();
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expect(o.foo).toBeUndefined();
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});
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test("deleting existent, non-configurable, writable property", () => {
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var o = {};
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Object.defineProperty(o, "foo", { value: 1, configurable: false, writable: true });
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expect(Reflect.deleteProperty(o, "foo")).toBeFalse();
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expect(o.foo).toBe(1);
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});
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test("deleting existent, non-configurable, non-writable property", () => {
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var o = {};
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Object.defineProperty(o, "foo", { value: 1, configurable: false, writable: false });
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expect(Reflect.deleteProperty(o, "foo")).toBeFalse();
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expect(o.foo).toBe(1);
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});
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test("deleting array index", () => {
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var a = [1, 2, 3];
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expect(a).toHaveLength(3);
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expect(a[0]).toBe(1);
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expect(a[1]).toBe(2);
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expect(a[2]).toBe(3);
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expect(Reflect.deleteProperty(a, 1)).toBeTrue();
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expect(a).toHaveLength(3);
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expect(a[0]).toBe(1);
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expect(a[1]).toBeUndefined();
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expect(a[2]).toBe(3);
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});
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});
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