mirror of
https://github.com/RGBCube/serenity
synced 2025-10-31 09:22:44 +00:00
48 lines
2.1 KiB
JavaScript
48 lines
2.1 KiB
JavaScript
test("length", () => {
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expect(String.prototype[Symbol.iterator]).toHaveLength(0);
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});
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test("basic functionality", () => {
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const s = "abcd";
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const it = s[Symbol.iterator]();
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expect(it.next()).toEqual({ value: "a", done: false });
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expect(it.next()).toEqual({ value: "b", done: false });
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expect(it.next()).toEqual({ value: "c", done: false });
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expect(it.next()).toEqual({ value: "d", done: false });
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expect(it.next()).toEqual({ value: undefined, done: true });
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expect(it.next()).toEqual({ value: undefined, done: true });
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expect(it.next()).toEqual({ value: undefined, done: true });
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});
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test("casts |this| to string", () => {
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let it = String.prototype[Symbol.iterator].call(45);
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expect(it.next()).toEqual({ value: "4", done: false });
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expect(it.next()).toEqual({ value: "5", done: false });
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expect(it.next()).toEqual({ value: undefined, done: true });
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it = String.prototype[Symbol.iterator].call(false);
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expect(it.next()).toEqual({ value: "f", done: false });
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expect(it.next()).toEqual({ value: "a", done: false });
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expect(it.next()).toEqual({ value: "l", done: false });
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expect(it.next()).toEqual({ value: "s", done: false });
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expect(it.next()).toEqual({ value: "e", done: false });
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expect(it.next()).toEqual({ value: undefined, done: true });
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expect(() => {
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String.prototype[Symbol.iterator].call(null);
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}).toThrowWithMessage(TypeError, "null cannot be converted to an object");
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expect(() => {
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String.prototype[Symbol.iterator].call(undefined);
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}).toThrowWithMessage(TypeError, "undefined cannot be converted to an object");
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});
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test("utf8 compatible", () => {
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const it = "ab\u{1f41e}cde"[Symbol.iterator]();
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expect(it.next()).toEqual({ value: "a", done: false });
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expect(it.next()).toEqual({ value: "b", done: false });
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expect(it.next()).toEqual({ value: "🐞", done: false });
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expect(it.next()).toEqual({ value: "c", done: false });
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expect(it.next()).toEqual({ value: "d", done: false });
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expect(it.next()).toEqual({ value: "e", done: false });
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expect(it.next()).toEqual({ value: undefined, done: true });
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});
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