MakeCluster creates a cluster using either ADS or EDS.

MakeEndpoint creates a localhost endpoint on a given port.

MakeHTTPListener creates a listener using either ADS or RDS for the route.

MakeRoute creates an HTTP route that routes to a given cluster.

MakeTCPListener creates a TCP listener for a cluster.

Ads mode for resources: one aggregated xDS service.

Rest mode for resources: polling using Fetch.

Xds mode for resources: individual xDS services.

XdsCluster is the cluster name for the control server (used by non-ADS set-up).

RefreshDelay for the polling config source.

TestSnapshot holds parameters for a synthetic snapshot.