node/test/parallel/test-whatwg-webstreams-encoding.js

// Flags: --no-warnings
'use strict';

const common = require('../common');
const assert = require('assert');

const {
  TextEncoderStream,
  TextDecoderStream,
} = require('stream/web');

const kEuroBytes = Buffer.from([0xe2, 0x82, 0xac]);
const kEuro = Buffer.from([0xe2, 0x82, 0xac]).toString();

[1, false, [], {}, 'hello'].forEach((i) => {
  assert.throws(() => new TextDecoderStream(i), {
    code: 'ERR_ENCODING_NOT_SUPPORTED',
  });
});

[1, false, 'hello'].forEach((i) => {
  assert.throws(() => new TextDecoderStream(undefined, i), {
    code: 'ERR_INVALID_ARG_TYPE',
  });
});

{
  const tds = new TextDecoderStream();
  const writer = tds.writable.getWriter();
  const reader = tds.readable.getReader();
  reader.read().then(common.mustCall(({ value, done }) => {
    assert(!done);
    assert.strictEqual(kEuro, value);
    reader.read().then(common.mustCall(({ done }) => {
      assert(done);
    }));
  }));
  Promise.all([
    writer.write(kEuroBytes.slice(0, 1)),
    writer.write(kEuroBytes.slice(1, 2)),
    writer.write(kEuroBytes.slice(2, 3)),
    writer.close(),
  ]).then(common.mustCall());

  assert.strictEqual(tds.encoding, 'utf-8');
  assert.strictEqual(tds.fatal, false);
  assert.strictEqual(tds.ignoreBOM, false);
  ['encoding', 'fatal', 'ignoreBOM', 'readable', 'writable'].forEach((getter) => {
    assert.throws(
      () => Reflect.get(TextDecoderStream.prototype, getter, {}), {
        name: 'TypeError',
        message: /Cannot read private member/,
        stack: new RegExp(`at get ${getter}`)
      }
    );
  });
}

{
  const tds = new TextEncoderStream();
  const writer = tds.writable.getWriter();
  const reader = tds.readable.getReader();
  reader.read().then(common.mustCall(({ value, done }) => {
    assert(!done);
    const buf = Buffer.from(value.buffer, value.byteOffset, value.byteLength);
    assert.deepStrictEqual(kEuroBytes, buf);
    reader.read().then(common.mustCall(({ done }) => {
      assert(done);
    }));
  }));
  Promise.all([
    writer.write(kEuro),
    writer.close(),
  ]).then(common.mustCall());

  assert.strictEqual(tds.encoding, 'utf-8');
  ['encoding', 'readable', 'writable'].forEach((getter) => {
    assert.throws(
      () => Reflect.get(TextDecoderStream.prototype, getter, {}), {
        name: 'TypeError',
        message: /Cannot read private member/,
        stack: new RegExp(`at get ${getter}`)
      }
    );
  });
}