very basic UDP server and client with test. net.Dial creates different addresses even though I set the port to 9000

client_test.go

package client

import (
	"fmt"
	"testing"

	a "../go_server"
)

func TestPort(t *testing.T) {
	server := a.CreateServer("9000")
	client := CreateClient("9000")
	fmt.Println(client.LocalAddr())
	fmt.Println(server.LocalAddr())

}

x_client.go

package client

import (
	"log"
	"net"
)

func CreateClient(port string) net.Conn {
	client, err := net.Dial("udp", "localhost:"+port)
	if err != nil {
		log.Fatal(err)
	}
	return client
}

x_server.go

package server

import (
	"net"
)

func CreateServer(port string) net.Conn {

	conn, _ := net.Dial("udp", "localhost:"+port)
	defer conn.Close()
	return conn
}