CurrentRedisPort getter to return embedded redis port.

CurrentRedisServer getter to return embedded redis.

Redis start redis at random port (32768-65535) on test package level.

RedisWithPort start redis at given port (must between 32768 and 65535) on test package level.

ServerTLSWithCerts construct a tls.Config with certificates in a given filesystem.

WithRedis start redis at random port (32768-65535) on per test basis The actual port get be get using CurrentRedisPort.