1 files changed, 40 insertions, 0 deletions
diff --git a/testing/web-platform/tests/encoding/textdecoder-eof.any.js b/testing/web-platform/tests/encoding/textdecoder-eof.any.js
new file mode 100644
index 0000000000..e41e326aac
--- /dev/null
+++ b/testing/web-platform/tests/encoding/textdecoder-eof.any.js
@@ -0,0 +1,40 @@
+test(() => {
+  // 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");
+}, "TextDecoder end-of-queue handling");
+
+test(() => {
+  const decoder = new TextDecoder();
+  decoder.decode(new Uint8Array([0xF0]), { stream: true });
+  assert_equals(decoder.decode(), "\uFFFD");
+
+  decoder.decode(new Uint8Array([0xF0]), { stream: true });
+  decoder.decode(new Uint8Array([0x9F]), { stream: true });
+  assert_equals(decoder.decode(), "\uFFFD");
+
+  decoder.decode(new Uint8Array([0xF0, 0x9F]), { stream: true });
+  assert_equals(decoder.decode(new Uint8Array([0x92])), "\uFFFD");
+
+  assert_equals(decoder.decode(new Uint8Array([0xF0, 0x9F]), { stream: true }), "");
+  assert_equals(decoder.decode(new Uint8Array([0x41]), { stream: true }), "\uFFFDA");
+  assert_equals(decoder.decode(), "");
+
+  assert_equals(decoder.decode(new Uint8Array([0xF0, 0x41, 0x42]), { stream: true }), "\uFFFDAB");
+  assert_equals(decoder.decode(), "");
+
+  assert_equals(decoder.decode(new Uint8Array([0xF0, 0x41, 0xF0]), { stream: true }), "\uFFFDA");
+  assert_equals(decoder.decode(), "\uFFFD");
+
+  assert_equals(decoder.decode(new Uint8Array([0xF0]), { stream: true }), "");
+  assert_equals(decoder.decode(new Uint8Array([0x8F]), { stream: true }), "\uFFFD\uFFFD");
+  assert_equals(decoder.decode(new Uint8Array([0x92]), { stream: true }), "\uFFFD");
+  assert_equals(decoder.decode(), "");
+}, "TextDecoder end-of-queue handling using stream: true");