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test("length is 3", () => {
expect(Reflect.set).toHaveLength(3);
});
describe("errors", () => {
test("target must be an object", () => {
[null, undefined, "foo", 123, NaN, Infinity].forEach(value => {
expect(() => {
Reflect.set(value);
}).toThrowWithMessage(TypeError, "First argument of Reflect.set() must be an object");
});
});
});
describe("normal behavior", () => {
test("setting properties of regular object", () => {
var o = {};
expect(Reflect.set(o)).toBeTrue();
expect(o.undefined).toBeUndefined();
expect(Reflect.set(o, "foo")).toBeTrue();
expect(o.foo).toBeUndefined();
expect(Reflect.set(o, "foo", "bar")).toBeTrue();
expect(o.foo).toBe("bar");
expect(Reflect.set(o, "foo", 42)).toBeTrue();
expect(o.foo).toBe(42);
});
test("setting configurable, non-writable property of regular object", () => {
var o = {};
Object.defineProperty(o, "foo", { value: 1, configurable: true, writable: false });
expect(Reflect.set(o, "foo", 2)).toBeFalse();
expect(o.foo).toBe(1);
});
test("setting non-configurable, writable property of regular object", () => {
var o = {};
Object.defineProperty(o, "foo", { value: 1, configurable: false, writable: true });
expect(Reflect.set(o, "foo", 2)).toBeTrue();
expect(o.foo).toBe(2);
});
test("", () => {
var a = [];
expect(a.length === 0);
expect(Reflect.set(a, "0")).toBeTrue();
expect(a.length === 1);
expect(a[0]).toBeUndefined();
expect(Reflect.set(a, 1, "foo")).toBeTrue();
expect(a.length === 2);
expect(a[0]).toBeUndefined();
expect(a[1] === "foo");
expect(Reflect.set(a, 4, "bar")).toBeTrue();
expect(a.length === 5);
expect(a[0]).toBeUndefined();
expect(a[1] === "foo");
expect(a[2]).toBeUndefined();
expect(a[3]).toBeUndefined();
expect(a[4] === "bar");
});
test("setting setter property of regular object", () => {
const foo = {
set prop(value) {
this.setPropCalled = true;
},
};
expect(foo.setPropCalled).toBeUndefined();
Reflect.set(foo, "prop", 42);
expect(foo.setPropCalled).toBeTrue();
});
test("setting setter property of regular object with different receiver", () => {
const foo = {
set prop(value) {
this.setPropCalled = true;
},
};
const bar = {};
Object.setPrototypeOf(bar, foo);
expect(foo.setPropCalled).toBeUndefined();
expect(bar.setPropCalled).toBeUndefined();
Reflect.set(bar, "prop", 42);
expect(foo.setPropCalled).toBeUndefined();
expect(bar.setPropCalled).toBeTrue();
Reflect.set(bar, "prop", 42, foo);
expect(foo.setPropCalled).toBeTrue();
expect(bar.setPropCalled).toBeTrue();
});
test("native setter function", () => {
const e = new Error();
Reflect.set(Error.prototype, "name", "Foo", e);
expect(e.name).toBe("Foo");
});
});
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