Function test

test/parallel/test-fs-read.js:32–46

(bufferAsync, bufferSync, expected)

const expected = Buffer.from('xyz\n');

function test(bufferAsync, bufferSync, expected) {
  fs.read(fd,
          bufferAsync,
          0,
          expected.length,
          0,
          common.mustSucceed((bytesRead) => {
            assert.strictEqual(bytesRead, expected.length);
            assert.deepStrictEqual(bufferAsync, expected);
          }));

  const r = fs.readSync(fd, bufferSync, 0, expected.length, 0);
  assert.deepStrictEqual(bufferSync, expected);
  assert.strictEqual(r, expected.length);
}

test(Buffer.allocUnsafe(expected.length),
     Buffer.allocUnsafe(expected.length),