Most of the
data centers are in regular practice to test their generators by simply spinning them up. But, there might be few which preferably put them under load for an extended time period. As a matter of fact, the entire process of load testing generators is quite expensive due to the fuel consumption and also load test banks are expensive equipment to initiate the process. You can ask your service provider if they put every generator on an extended load test at least quarterly, and preferably monthly.