decode-utf8.any.js

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This test has a WPT meta file that expects 5 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /encoding/streams/decode-utf8.any.html - WPT Dashboard Interop Dashboard
- /encoding/streams/decode-utf8.any.serviceworker.html - WPT Dashboard Interop Dashboard
- /encoding/streams/decode-utf8.any.sharedworker.html - WPT Dashboard Interop Dashboard
- /encoding/streams/decode-utf8.any.worker.html - WPT Dashboard Interop Dashboard

// 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');