public void ExpireKeyTest()
{
var keyName = KeyName();
const string keyValue = "1.0";
_redisService.Remove(keyName);
_redisService.SetString(keyName, keyValue);
//check if the key exist
var result = _redisService.GetString(keyName);
Assert.Equal(keyValue, result);
//expire the key
_redisService.ExpireKey(keyName, TimeSpan.FromSeconds(2));
Task.Delay(2100).GetAwaiter().GetResult();
//check if the key exist
var result2 = _redisService.GetString(keyName);
Assert.Null(result2);
}