switch: implemented test environment

src/switch/config/config.json

+{"ConfigDir":"","ControllerIP":"192.168.122.60","NodeName":"ant-machine","NedName":"ant-machine-example-network-controller"}

src/switch/config/neighbors.json

+{"name":"ant-machine","nodeIP":"192.168.122.60","neighborNodes":["192.168.122.244"]}
+

src/switch/test/client_test.go

+package main
+
+import (
+	"context"
+	"fmt"
+	"log"
+	"time"
+
+	"l2sm.local/ovs-switch/pkg/nedpb"
+
+	"google.golang.org/grpc"
+)
+
+func main() {
+	// Set up a connection to the gRPC server.
+	conn, err := grpc.Dial("localhost:50051", grpc.WithInsecure()) // Update with the actual server address and credentials if needed
+	if err != nil {
+		log.Fatalf("Failed to connect to gRPC server: %v", err)
+	}
+	defer conn.Close()
+
+	// Create a new client for the NedService.
+	client := nedpb.NewNedServiceClient(conn)
+
+	// Create a context with a timeout to ensure that the request doesn't hang.
+	ctx, cancel := context.WithTimeout(context.Background(), time.Second*10)
+	defer cancel()
+
+	// Prepare the request with the interface name "br10".
+	req := &nedpb.AttachInterfaceRequest{
+		InterfaceName: "br10",
+	}
+
+	// Call the AttachInterface method.
+	resp, err := client.AttachInterface(ctx, req)
+	if err != nil {
+		log.Fatalf("Error calling AttachInterface: %v", err)
+	}
+
+	// Handle and display the response.
+	fmt.Printf("Interface attached successfully:\n")
+	fmt.Printf("Interface Number: %d\n", resp.GetInterfaceNum())
+	fmt.Printf("Node Name: %s\n", resp.GetNodeName())
+}