Function writeFileTest

test/parallel/test-fs-promises-writefile-with-fd.js:16–31

()

const fn = tmpdir.resolve('test.txt');

async function writeFileTest() {
  const handle = await open(fn, 'w');

  /* Write only five bytes, so that the position moves to five. */
  const buf = Buffer.from('Hello');
  const { bytesWritten } = await handle.write(buf, 0, 5, null);
  assert.strictEqual(bytesWritten, 5);

  /* Write some more with writeFile(). */
  await handle.writeFile('World');

  /* New content should be written at position five, instead of zero. */
  assert.strictEqual(readFileSync(fn).toString(), 'HelloWorld');

  await handle.close();
}


writeFileTest()