Client.sismember(key, member)

import redis from 'k6/experimental/redis';

// Get the redis instance(s) address and password from the environment
const redis_addrs = __ENV.REDIS_ADDRS || '';
const redis_password = __ENV.REDIS_PASSWORD || '';

// Instantiate a new redis client
const redisClient = new redis.Client({
  addrs: redis_addrs.split(',') || new Array('localhost:6379'), // in the form of 'host:port', separated by commas
  password: redis_password,
});

export default function () {
  redisClient
    .sadd('myset', 'foo')
    .then((_) => redisClient.sadd('myset', 'bar'))
    .then((_) => redisClient.sismember('myset', 'foo'))
    .then((isit) => {
      if (isit === false) {
        throw new Error('sismember should have returned true');
      }
    });
}