vSphere Replication as a standalone product has no ability to automate DR tasks such as a test, a failover, or a failback. SRM can be used to leverage vSphere Replication as the replication engine and use its orchestration ability to automate the DR tasks. Refer to following diagram:

SRM relies on the concept of two sites replicating data between them with the help of a replication engine. So, you need two sites managed separately by two different vCenter Servers. Each of the vCenter Servers should have a VRMS instance registered to it. This means you need to deploy a vSphere Replication Appliance (VRA) at both the sites. Once the VRA is deployed, use the vSphere Web Client's vSphere Replication interface at the protected site to add the recovery site as the target site. For more information on how to add target sites, refer to the Adding a remote site as a target section. For SRM to detect the registered vSphere Replication Appliances at both the sites...