1 files changed, 83 insertions, 0 deletions
diff --git a/testing/web-platform/tests/encoding/streams/decode-non-utf8.any.js b/testing/web-platform/tests/encoding/streams/decode-non-utf8.any.js
new file mode 100644
index 0000000000..2950a9e58e
--- /dev/null
+++ b/testing/web-platform/tests/encoding/streams/decode-non-utf8.any.js
@@ -0,0 +1,83 @@
+// META: global=window,worker
+
+'use strict';
+
+// The browser is assumed to use the same implementation as for TextDecoder, so
+// this file don't replicate the exhaustive checks it has. It is just a smoke
+// test that non-UTF-8 encodings work at all.
+
+const encodings = [
+  {
+    name: 'UTF-16BE',
+    value: [108, 52],
+    expected: "\u{6c34}",
+    invalid: [0xD8, 0x00]
+  },
+  {
+    name: 'UTF-16LE',
+    value: [52, 108],
+    expected: "\u{6c34}",
+    invalid: [0x00, 0xD8]
+  },
+  {
+    name: 'Shift_JIS',
+    value: [144, 133],
+    expected: "\u{6c34}",
+    invalid: [255]
+  },
+  {
+    name: 'ISO-2022-JP',
+    value: [65, 66, 67, 0x1B, 65, 66, 67],
+    expected: "ABC\u{fffd}ABC",
+    invalid: [0x0E]
+  },
+  {
+    name: 'ISO-8859-14',
+    value: [100, 240, 114],
+    expected: "d\u{0175}r",
+    invalid: undefined  // all bytes are treated as valid
+  }
+];
+
+for (const encoding of encodings) {
+  promise_test(async () => {
+    const stream = new TextDecoderStream(encoding.name);
+    const reader = stream.readable.getReader();
+    const writer = stream.writable.getWriter();
+    const writePromise = writer.write(new Uint8Array(encoding.value));
+    const {value, done} = await reader.read();
+    assert_false(done, 'readable should not be closed');
+    assert_equals(value, encoding.expected, 'chunk should match expected');
+    await writePromise;
+  }, `TextDecoderStream should be able to decode ${encoding.name}`);
+
+  if (!encoding.invalid)
+    continue;
+
+  promise_test(async t => {
+    const stream = new TextDecoderStream(encoding.name);
+    const reader = stream.readable.getReader();
+    const writer = stream.writable.getWriter();
+    const writePromise = writer.write(new Uint8Array(encoding.invalid));
+    const closePromise = writer.close();
+    const {value, done} = await reader.read();
+    assert_false(done, 'readable should not be closed');
+    assert_equals(value, '\u{FFFD}', 'output should be replacement character');
+    await Promise.all([writePromise, closePromise]);
+  }, `TextDecoderStream should be able to decode invalid sequences in ` +
+     `${encoding.name}`);
+
+  promise_test(async t => {
+    const stream = new TextDecoderStream(encoding.name, {fatal: true});
+    const reader = stream.readable.getReader();
+    const writer = stream.writable.getWriter();
+    const writePromise = writer.write(new Uint8Array(encoding.invalid));
+    const closePromise = writer.close();
+    await promise_rejects_js(t, TypeError, reader.read(),
+                          'readable should be errored');
+    await promise_rejects_js(t, TypeError,
+                          Promise.all([writePromise, closePromise]),
+                          'writable should be errored');
+  }, `TextDecoderStream should be able to reject invalid sequences in ` +
+     `${encoding.name}`);
+}