Reorganize tests (#2332)

1 files changed, 243 insertions, 0 deletions

diff --git a/test/js/web/encoding/text-decoder.test.js b/test/js/web/encoding/text-decoder.test.js
new file mode 100644
index 000000000..abd4c2a72
--- /dev/null
+++ b/test/js/web/encoding/text-decoder.test.js
@@ -0,0 +1,243 @@
+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("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");
+});