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bun.sh/test/js/web/encoding/text-decoder.test.js
Dylan Conway 70a5cfe908 fix text decode trim (#4495) 
* remove trim

* separate function

* a test

* trim when `stream` is true

---------

Co-authored-by: Jarred Sumner <jarred@jarredsumner.com>
2023-09-05 17:53:31 -07:00

277 lines
18 KiB
JavaScript
Raw Blame History

import { expect, it, describe } from "bun:test";
import { gc as gcTrace, withoutAggressiveGC } from "harness";
const getByteLength = str => {
// returns the byte length of an utf8 string
var s = str.length;
for (var i = str.length - 1; i >= 0; i--) {
var code = str.charCodeAt(i);
if (code > 0x7f && code <= 0x7ff) s++;
else if (code > 0x7ff && code <= 0xffff) s += 2;
if (code >= 0xdc00 && code <= 0xdfff) i--; //trail surrogate
}
return s;
};
describe("TextDecoder", () => {
it("should not crash on empty text", () => {
const decoder = new TextDecoder();
gcTrace(true);
const fixtures = [new Uint8Array(), new Uint8Array([]), new Buffer(0), new ArrayBuffer(0), new Uint16Array(0)];
for (let input of fixtures) {
expect(decoder.decode(input)).toBe("");
}
// Cause a de-opt
try {
decoder.decode([NaN, Symbol("s")]);
} catch (e) {}
// DOMJIT test
for (let i = 0; i < 90000; i++) {
decoder.decode(fixtures[0]);
}
gcTrace(true);
});
it("should decode ascii text", () => {
const decoder = new TextDecoder("latin1");
gcTrace(true);
expect(decoder.encoding).toBe("windows-1252");
gcTrace(true);
expect(decoder.decode(new Uint8Array([0x41, 0x42, 0x43]))).toBe("ABC");
gcTrace(true);
// hit the SIMD code path
const result = [
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33,
];
gcTrace(true);
expect(decoder.decode(Uint8Array.from(result))).toBe(String.fromCharCode(...result));
gcTrace(true);
});
it("should decode unicode text", () => {
const decoder = new TextDecoder();
gcTrace(true);
const inputBytes = [226, 157, 164, 239, 184, 143, 32, 82, 101, 100, 32, 72, 101, 97, 114, 116];
for (var repeat = 1; repeat < 100; repeat++) {
var text = `❤️ Red Heart`.repeat(repeat);
var bytes = Array.from({ length: repeat }, () => inputBytes).flat();
var decoded = decoder.decode(Uint8Array.from(bytes));
expect(decoder.encoding).toBe("utf-8");
expect(decoded).toBe(text);
gcTrace(true);
}
});
describe("typedArrays", () => {
var text = `ABC DEF GHI JKL MNO PQR STU VWX YZ ABC DEF GHI JKL MNO PQR STU V`;
var bytes = new TextEncoder().encode(text);
var decoder = new TextDecoder();
for (let TypedArray of [
Uint8Array,
Uint16Array,
Uint32Array,
Int8Array,
Int16Array,
Int32Array,
Float32Array,
Float64Array,
DataView,
BigInt64Array,
BigUint64Array,
]) {
it(`should decode ${TypedArray.name}`, () => {
const decoded = decoder.decode(new TypedArray(bytes.buffer));
expect(decoded).toBe(text);
});
}
it("DOMJIT call", () => {
const array = new Uint8Array(bytes.buffer);
withoutAggressiveGC(() => {
for (let i = 0; i < 100_000; i++) {
const decoded = decoder.decode(array);
expect(decoded).toBe(text);
}
});
});
});
it("should decode unicode text with multiple consecutive emoji", () => {
const decoder = new TextDecoder();
const encoder = new TextEncoder();
gcTrace(true);
var text = `❤️❤️❤️❤️❤️❤️ Red Heart`;
text += ` ✨ Sparkles 🔥 Fire 😀 😃 😄 😁 😆 😅 😂 🤣 🥲 ☺️ 😊 😇 🙂 🙃 😉 😌 😍 🥰 😘 😗 😙 😚 😋 😛 😝 😜 🤪 🤨 🧐 🤓 😎 🥸 🤩 🥳 😏 😒 😞 😔 😟 😕 🙁 ☹️ 😣 😖 😫 😩 🥺 😢 😭 😤 😠 😡 🤬 🤯 😳 🥵 🥶 😱 😨 😰`;
gcTrace(true);
expect(decoder.decode(encoder.encode(text))).toBe(text);
gcTrace(true);
const bytes = new Uint8Array(getByteLength(text) * 8);
gcTrace(true);
const amount = encoder.encodeInto(text, bytes);
gcTrace(true);
expect(decoder.decode(bytes.subarray(0, amount.written))).toBe(text);
gcTrace(true);
});
it("should respect fatal when encountering invalid data", () => {
const decoder = new TextDecoder("utf-8", { fatal: true });
expect(() => {
decoder.decode(new Uint8Array([0xc0])); // Invalid UTF8
}).toThrow(TypeError);
});
it("should not trim invalid byte sequences when fatal is false", () => {
const buf = Buffer.from([77, 97, 110, 32, 208, 129, 240, 164, 173]);
const received = new TextDecoder("utf-8").decode(buf);
const expected = "Man Ё\ufffd";
expect(received).toBe(expected);
});
it("should trim when stream is true", () => {
const buf = Buffer.from([77, 97, 110, 32, 208, 129, 240, 164, 173]);
const received = new TextDecoder("utf-8").decode(buf, { stream: true });
const expected = "Man Ё";
expect(received).toBe(expected);
});
it("constructor should set values", () => {
const decoder = new TextDecoder("utf-8", { fatal: true, ignoreBOM: false });
expect(decoder.fatal).toBe(true);
// expect(decoder.ignoreBOM).toBe(false); // currently the getter for ignoreBOM doesn't work and always returns undefined
});
it("should throw on invalid input", () => {
expect(() => {
const decoder = new TextDecoder("utf-8", { fatal: 10, ignoreBOM: {} });
}).toThrow();
});
});
it("truncated sequences", () => {
const assert_equals = (a, b) => expect(a).toBe(b);
// Truncated sequences
assert_equals(new TextDecoder().decode(new Uint8Array([0xf0])), "\uFFFD");
assert_equals(new TextDecoder().decode(new Uint8Array([0xf0, 0x9f])), "\uFFFD");
assert_equals(new TextDecoder().decode(new Uint8Array([0xf0, 0x9f, 0x92])), "\uFFFD");
// Errors near end-of-queue
assert_equals(new TextDecoder().decode(new Uint8Array([0xf0, 0x9f, 0x41])), "\uFFFDA");
assert_equals(new TextDecoder().decode(new Uint8Array([0xf0, 0x41, 0x42])), "\uFFFDAB");
assert_equals(new TextDecoder().decode(new Uint8Array([0xf0, 0x41, 0xf0])), "\uFFFDA\uFFFD");
assert_equals(new TextDecoder().decode(new Uint8Array([0xf0, 0x8f, 0x92])), "\uFFFD\uFFFD\uFFFD");
});
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