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LibJS: Implement String.prototype.toWellFormed
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describe("errors", () => {
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test("called with value that cannot be converted to a string", () => {
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expect(() => {
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String.prototype.toWellFormed.call(Symbol.hasInstance);
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}).toThrowWithMessage(TypeError, "Cannot convert symbol to string");
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});
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});
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describe("basic functionality", () => {
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test("ascii strings", () => {
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expect("".toWellFormed()).toBe("");
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expect("foo".toWellFormed()).toBe("foo");
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expect("abcdefghi".toWellFormed()).toBe("abcdefghi");
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});
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test("valid UTF-16 strings", () => {
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expect("😀".toWellFormed()).toBe("😀");
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expect("\ud83d\ude00".toWellFormed()).toBe("\ud83d\ude00");
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});
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test("invalid UTF-16 strings", () => {
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expect("😀".slice(0, 1).toWellFormed()).toBe("\ufffd");
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expect("😀".slice(1, 2).toWellFormed()).toBe("\ufffd");
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expect("\ud83d".toWellFormed()).toBe("\ufffd");
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expect("\ude00".toWellFormed()).toBe("\ufffd");
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expect("a\ud83d".toWellFormed()).toBe("a\ufffd");
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expect("a\ude00".toWellFormed()).toBe("a\ufffd");
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expect("\ud83da".toWellFormed()).toBe("\ufffda");
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expect("\ude00a".toWellFormed()).toBe("\ufffda");
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expect("a\ud83da".toWellFormed()).toBe("a\ufffda");
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expect("a\ude00a".toWellFormed()).toBe("a\ufffda");
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});
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test("object converted to a string", () => {
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let toStringCalled = false;
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const obj = {
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toString: function () {
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toStringCalled = true;
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return "toString";
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},
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};
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expect(String.prototype.toWellFormed.call(obj)).toBe("toString");
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expect(toStringCalled).toBeTrue();
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});
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});
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