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LibJS: Add String Iterator tests

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Matthew Olsson 2020-07-12 12:51:12 -07:00 • committed by Andreas Kling
parent c831fb17bf
commit 4c3a415dc3
2 changed files with 49 additions and 1 deletions
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48
Libraries/LibJS/Tests/iterators/string-iterator.js Normal file
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test("length", () => {
expect(String.prototype[Symbol.iterator]).toHaveLength(0);
});
test("basic functionality", () => {
const s = "abcd";
const it = s[Symbol.iterator]();
expect(it.next()).toEqual({ value: "a", done: false });
expect(it.next()).toEqual({ value: "b", done: false });
expect(it.next()).toEqual({ value: "c", done: false });
expect(it.next()).toEqual({ value: "d", done: false });
expect(it.next()).toEqual({ value: undefined, done: true });
expect(it.next()).toEqual({ value: undefined, done: true });
expect(it.next()).toEqual({ value: undefined, done: true });
});
test("casts |this| to string", () => {
const it = String.prototype[Symbol.iterator].call(45);
expect(it.next()).toEqual({ value: "4", done: false });
expect(it.next()).toEqual({ value: "5", done: false });
expect(it.next()).toEqual({ value: undefined, done: true });
const it = String.prototype[Symbol.iterator].call(false);
expect(it.next()).toEqual({ value: "f", done: false });
expect(it.next()).toEqual({ value: "a", done: false });
expect(it.next()).toEqual({ value: "l", done: false });
expect(it.next()).toEqual({ value: "s", done: false });
expect(it.next()).toEqual({ value: "e", done: false });
expect(it.next()).toEqual({ value: undefined, done: true });
expect(() => {
String.prototype[Symbol.iterator].call(null);
}).toThrowWithMessage(TypeError, "ToObject on null or undefined");
expect(() => {
String.prototype[Symbol.iterator].call(undefined);
}).toThrowWithMessage(TypeError, "ToObject on null or undefined");
});
test("utf8 compatible", () => {
const it = "ab\u{1f41e}cde"[Symbol.iterator]();
expect(it.next()).toEqual({ value: "a", done: false });
expect(it.next()).toEqual({ value: "b", done: false });
expect(it.next()).toEqual({ value: "🐞", done: false });
expect(it.next()).toEqual({ value: "c", done: false });
expect(it.next()).toEqual({ value: "d", done: false });
expect(it.next()).toEqual({ value: "e", done: false });
expect(it.next()).toEqual({ value: undefined, done: true });
});