1 files changed, 76 insertions, 0 deletions
diff --git a/testing/web-platform/tests/encoding/streams/decode-utf8.any.js b/testing/web-platform/tests/encoding/streams/decode-utf8.any.js
new file mode 100644
index 0000000000..f6fceb299b
--- /dev/null
+++ b/testing/web-platform/tests/encoding/streams/decode-utf8.any.js
@@ -0,0 +1,76 @@
+// META: global=window,worker
+// META: script=resources/readable-stream-from-array.js
+// META: script=resources/readable-stream-to-array.js
+// META: script=/common/sab.js
+'use strict';
+
+["ArrayBuffer", "SharedArrayBuffer"].forEach((arrayBufferOrSharedArrayBuffer) => {
+  const inputChunkData = [73, 32, 240, 159, 146, 153, 32, 115, 116, 114, 101, 97, 109, 115];
+
+  const emptyChunk = new Uint8Array(createBuffer(arrayBufferOrSharedArrayBuffer, 0));
+  const inputChunk = new Uint8Array(createBuffer(arrayBufferOrSharedArrayBuffer, inputChunkData.length));
+
+  inputChunk.set(inputChunkData);
+
+  const expectedOutputString = 'I \u{1F499} streams';
+
+  promise_test(async () => {
+    const input = readableStreamFromArray([inputChunk]);
+    const output = input.pipeThrough(new TextDecoderStream());
+    const array = await readableStreamToArray(output);
+    assert_array_equals(array, [expectedOutputString],
+                        'the output should be in one chunk');
+  }, 'decoding one UTF-8 chunk should give one output string - ' + arrayBufferOrSharedArrayBuffer);
+
+  promise_test(async () => {
+    const input = readableStreamFromArray([emptyChunk]);
+    const output = input.pipeThrough(new TextDecoderStream());
+    const array = await readableStreamToArray(output);
+    assert_array_equals(array, [], 'no chunks should be output');
+  }, 'decoding an empty chunk should give no output chunks - ' + arrayBufferOrSharedArrayBuffer);
+
+  promise_test(async () => {
+    const input = readableStreamFromArray([emptyChunk, inputChunk]);
+    const output = input.pipeThrough(new TextDecoderStream());
+    const array = await readableStreamToArray(output);
+    assert_array_equals(array, [expectedOutputString],
+                        'the output should be in one chunk');
+  }, 'an initial empty chunk should be ignored - ' + arrayBufferOrSharedArrayBuffer);
+
+  promise_test(async () => {
+    const input = readableStreamFromArray([inputChunk, emptyChunk]);
+    const output = input.pipeThrough(new TextDecoderStream());
+    const array = await readableStreamToArray(output);
+    assert_array_equals(array, [expectedOutputString],
+                        'the output should be in one chunk');
+  }, 'a trailing empty chunk should be ignored - ' + arrayBufferOrSharedArrayBuffer);
+
+  promise_test(async () => {
+    const chunk = new Uint8Array(createBuffer(arrayBufferOrSharedArrayBuffer, 3));
+    chunk.set([0xF0, 0x9F, 0x92]);
+    const input = readableStreamFromArray([chunk]);
+    const output = input.pipeThrough(new TextDecoderStream());
+    const array = await readableStreamToArray(output);
+    assert_array_equals(array, ['\uFFFD']);
+  }, 'UTF-8 EOF handling - ' + arrayBufferOrSharedArrayBuffer);
+});
+
+promise_test(async () => {
+  const buffer = new ArrayBuffer(3);
+  const view = new Uint8Array(buffer, 1, 1);
+  view[0] = 65;
+  new MessageChannel().port1.postMessage(buffer, [buffer]);
+  const input = readableStreamFromArray([view]);
+  const output = input.pipeThrough(new TextDecoderStream());
+  const array = await readableStreamToArray(output);
+  assert_array_equals(array, [], 'no chunks should be output');
+}, 'decoding a transferred Uint8Array chunk should give no output');
+
+promise_test(async () => {
+  const buffer = new ArrayBuffer(1);
+  new MessageChannel().port1.postMessage(buffer, [buffer]);
+  const input = readableStreamFromArray([buffer]);
+  const output = input.pipeThrough(new TextDecoderStream());
+  const array = await readableStreamToArray(output);
+  assert_array_equals(array, [], 'no chunks should be output');
+}, 'decoding a transferred ArrayBuffer chunk should give no output');