You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: multicastlistener_test.go
    path of file: ./repos/gitkube/vendor/golang.org/x/net/ipv4
    
    the code of the file until where you have to start completion: // Copyright 2012 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package ipv4_test

import (
	"net"
	"runtime"
	"testing"

	"golang.org/x/net/internal/nettest"
	"golang.org/x/net/ipv4"
)

var udpMultipleGroupListenerTests = []net.Addr{
	&net.UDPAddr{IP: net.IPv4(224, 0, 0, 249)}, // see RFC 4727
	&net.UDPAddr{IP: net.IPv4(224, 0, 0, 250)},
	&net.UDPAddr{IP: net.IPv4(224, 0, 0, 254)},
}

func TestUDPSinglePacketConnWithMultipleGroupListeners(t *testing.T) {
	switch runtime.GOOS {
	case "js", "nacl", "plan9", "windows":
		t.Skipf("not supported on %s", runtime.GOOS)
	}
	if testing.Short() {
		t.Skip("to avoid external network")
	}

	for _, gaddr := range udpMultipleGroupListenerTests {
		c, err := net.ListenPacket("udp4", "0.0.0.0:0") // wildcard address with no reusable port
		if err != nil {
			t.Fatal(err)
		}
		defer c.Close()

		p := ipv4.NewPacketConn(c)
		var mift []*net.Interface

		ift, err := net.Interfaces()
		if err != nil {
			t.Fatal(err)
		}
		for i, ifi := range ift {
			if _, ok :
    
func TestUDPMultiplePacketConnWithMultipleGroupListeners(t *testing.T) {
	switch runtime.GOOS {
	case "js", "nacl", "plan9", "windows":
		t.Skipf("not supported on %s", runtime.GOOS)
	}
	if testing.Short() {
		t.Skip("to avoid external network")
	}

	for _, gaddr := range udpMultipleGroupListenerTests {
		c1, err := net.ListenPacket("udp4", "224.0.0.0:0") // wildcard address with reusable port
		if err != nil {
			t.Fatal(err)
		}
		defer c1.Close()
		_, port, err := net.SplitHostPort(c1.LocalAddr().String())
		if err != nil {
			t.Fatal(err)
		}
		c2, err := net.ListenPacket("udp4", net.JoinHostPort("224.0.0.0", port)) // wildcard address with reusable port
		if err != nil {
			t.Fatal(err)
		}
		defer c2.Close()

		var ps [2]*ipv4.PacketConn
		ps[0] = ipv4.NewPacketConn(c1)
		ps[1] = ipv4.NewPacketConn(c2)
		var mift []*net.Interface

		ift, err := net.Interfaces()
		if err != nil {
			t.Fatal(err)
		}
		for i, ifi := range ift {
			if _, ok := nettest.IsMulticastCapable("ip4", &ifi); !ok {
				continue
			}
			for _, p := range ps {
				if err := p.JoinGroup(&ifi, gaddr); err != nil {
					t.Fatal(err)
				}
			}
			mift = append(mift, &ift[i])
		}
		for _, ifi := range mift {
			for _, p := range ps {
				if err := p.LeaveGroup(ifi, gaddr); err != nil {
					t.Fatal(err)
				}
			}
		}
	}
}