Function doAppend

test/parallel/test-fs-promises-writefile.js:144–149

()

}

async function doAppend() {
  await fsPromises.appendFile(dest, buffer2, { flag: null });
  const data = fs.readFileSync(dest);
  const buf = Buffer.concat([buffer, buffer2]);
  assert.deepStrictEqual(buf, data);
}

async function doRead() {
  const data = await fsPromises.readFile(dest);