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test("length is 1", () => {
expect(Reflect.ownKeys).toHaveLength(1);
});
describe("errors", () => {
test("target must be an object", () => {
[null, undefined, "foo", 123, NaN, Infinity].forEach(value => {
expect(() => {
Reflect.ownKeys(value);
}).toThrowWithMessage(
TypeError,
"First argument of Reflect.ownKeys() must be an object"
);
});
});
});
describe("normal behavior", () => {
test("regular empty object has no own keys", () => {
var objectOwnKeys = Reflect.ownKeys({});
expect(objectOwnKeys instanceof Array).toBeTrue();
expect(objectOwnKeys).toHaveLength(0);
});
test("regular object with some properties has own keys", () => {
var symbol = Symbol("symbol");
var objectOwnKeys = Reflect.ownKeys({ foo: "bar", [symbol]: "qux", bar: "baz", 0: 42 });
expect(objectOwnKeys instanceof Array).toBeTrue();
expect(objectOwnKeys).toHaveLength(4);
expect(objectOwnKeys[0]).toBe("0");
expect(objectOwnKeys[1]).toBe("foo");
expect(objectOwnKeys[2]).toBe("bar");
expect(objectOwnKeys[3]).toBe(symbol);
});
test("empty array has only 'length' own key", () => {
var arrayOwnKeys = Reflect.ownKeys([]);
expect(arrayOwnKeys instanceof Array).toBeTrue();
expect(arrayOwnKeys).toHaveLength(1);
expect(arrayOwnKeys[0]).toBe("length");
});
test("array with some values has 'length' and indices own keys", () => {
var arrayOwnKeys = Reflect.ownKeys(["foo", [], 123, undefined]);
expect(arrayOwnKeys instanceof Array).toBeTrue();
expect(arrayOwnKeys).toHaveLength(5);
expect(arrayOwnKeys[0]).toBe("0");
expect(arrayOwnKeys[1]).toBe("1");
expect(arrayOwnKeys[2]).toBe("2");
expect(arrayOwnKeys[3]).toBe("3");
expect(arrayOwnKeys[4]).toBe("length");
});
});
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