username static method
Generates a random username in the format: adjective_noun123
Implementation
static String username() {
final adjective = _adjectives[_random.nextInt(_adjectives.length)];
final noun = _nouns[_random.nextInt(_nouns.length)];
final number = _random.nextInt(900) + 100; // 100-999
return '${adjective}_${noun}$number';
}