2bba20d123
String length is reported as the number of UTF-16 code units, and string indices are reported as the UTF-16 code units themselves.
42 lines
1.3 KiB
JavaScript
42 lines
1.3 KiB
JavaScript
test("constructor properties", () => {
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expect(String).toHaveLength(1);
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expect(String.name).toBe("String");
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});
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test("typeof", () => {
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expect(typeof String()).toBe("string");
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expect(typeof new String()).toBe("object");
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});
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test("length", () => {
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expect(new String().length).toBe(0);
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expect(new String("a").length).toBe(1);
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expect(new String("\u180E").length).toBe(1);
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expect(new String("\uDBFF\uDFFF").length).toBe(2);
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// Issue #2280
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expect("⛳".length).toBe(1);
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expect("🔥".length).toBe(2);
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expect("🔥🔥🔥".length).toBe(6);
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expect("👨👩👦".length).toBe(8);
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expect("👩❤️💋👩".length).toBe(11);
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});
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test("indices", () => {
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expect("abc"[0]).toBe("a");
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expect("abc"[1]).toBe("b");
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expect("abc"[2]).toBe("c");
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expect("abc"[3]).toBeUndefined();
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expect("😀"[0]).toBe("\ud83d");
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expect("😀"[1]).toBe("\ude00");
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expect("😀"[2]).toBeUndefined();
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});
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test("properties", () => {
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expect(Object.getOwnPropertyNames("")).toEqual(["length"]);
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expect(Object.getOwnPropertyNames("a")).toEqual(["0", "length"]);
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expect(Object.getOwnPropertyNames("ab")).toEqual(["0", "1", "length"]);
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expect(Object.getOwnPropertyNames("abc")).toEqual(["0", "1", "2", "length"]);
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expect(Object.getOwnPropertyNames("😀")).toEqual(["0", "1", "length"]);
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});
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