[#33] network: Add network endpoint getter to Address

Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>

pkg/network/address_test.go

@@ -0,0 +1,28 @@
+package network
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/multiformats/go-multiaddr"
+	"github.com/stretchr/testify/require"
+)
+
+func TestAddress_NetAddr(t *testing.T) {
+	ip := "127.0.0.1"
+	port := "8080"
+
+	ma, err := multiaddr.NewMultiaddr(strings.Join([]string{
+		"/ip4",
+		ip,
+		"tcp",
+		port,
+	}, "/"))
+
+	require.NoError(t, err)
+
+	addr, err := AddressFromString(ma.String())
+	require.NoError(t, err)
+
+	require.Equal(t, ip+":"+port, addr.NetAddr())
+}