mirror of
https://github.com/RGBCube/serenity
synced 2025-10-31 04:32:44 +00:00
a57e2f9a76
In the following use case:
"\ud834" + "\udf06"
We were previously combining these as two individual code points. When
concatenating strings, we must take care to combine the high surrogate
from the left-hand side with the low surrogate from the right-hand side.
30 lines
1 KiB
JavaScript
30 lines
1 KiB
JavaScript
test("adding strings", () => {
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expect("" + "").toBe("");
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expect("ab" + "").toBe("ab");
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expect("" + "cd").toBe("cd");
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expect("ab" + "cd").toBe("abcd");
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});
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test("adding strings with non-strings", () => {
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expect("a" + 1).toBe("a1");
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expect(1 + "a").toBe("1a");
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expect("a" + {}).toBe("a[object Object]");
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expect({} + "a").toBeNaN();
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expect("a" + []).toBe("a");
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expect([] + "a").toBe("a");
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expect("a" + NaN).toBe("aNaN");
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expect(NaN + "a").toBe("NaNa");
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expect(Array(16).join([[][[]] + []][+[]][++[+[]][+[]]] - 1) + " Batman!").toBe(
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"NaNNaNNaNNaNNaNNaNNaNNaNNaNNaNNaNNaNNaNNaNNaN Batman!"
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);
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});
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test("adding strings with dangling surrogates", () => {
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expect("\ud834" + "").toBe("\ud834");
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expect("" + "\udf06").toBe("\udf06");
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expect("\ud834" + "\udf06").toBe("𝌆");
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expect("\ud834" + "\ud834").toBe("\ud834\ud834");
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expect("\udf06" + "\udf06").toBe("\udf06\udf06");
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expect("\ud834a" + "\udf06").toBe("\ud834a\udf06");
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expect("\ud834" + "a\udf06").toBe("\ud834a\udf06");
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});
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