WIP: prepare for testing

abstract/abstract.go

@@ -16,7 +16,10 @@ package abstract
    limitations under the License.
 */
 
-import "time"
+import (
+	"net"
+	"time"
+)
 
 type ConnectionType int
 
@@ -42,4 +45,5 @@ type TCPConnectionConfig interface {
 type UDPConnectionConfig interface {
 	ConnectionConfig
 	Timeout() time.Duration
+	BackendAddr() net.Addr
 }