Function testStartOption

test/parallel/test-fs-promises-file-handle-writer.js:137–149

()

// =============================================================================

async function testStartOption() {
  const filePath = path.join(tmpDir, 'writer-start.txt');
  // Pre-fill with 10 A's
  fs.writeFileSync(filePath, 'AAAAAAAAAA');

  const fh = await open(filePath, 'r+');
  const w = fh.writer({ start: 3 });
  await w.write(Buffer.from('BBB'));
  await w.end();
  await fh.close();

  assert.strictEqual(fs.readFileSync(filePath, 'utf8'), 'AAABBBAAAA');
}

// =============================================================================
// start option - sequential writes advance position