in src/codec/redis.rs [121:131]
fn hsetnx(rng: &mut SmallRng, mode: &Mode, keyspace: &Keyspace, buf: &mut Session) {
let command = "hsetnx";
let args = vec![
keyspace.generate_key(rng),
keyspace
.generate_inner_key(rng)
.unwrap_or_else(|| b"".to_vec()),
keyspace.generate_value(rng).unwrap_or_else(|| b"".to_vec()),
];
Redis::command(buf, mode, command, args);
}