Implement peer String() method

peers/peers.go

@@ -4,6 +4,7 @@ import (
 	"encoding/binary"
 	"fmt"
 	"net"
+	"strconv"
 )
 
 // Peer encodes connection information for a peer
@@ -28,3 +29,7 @@ func Unmarshal(peersBin []byte) ([]Peer, error) {
 	}
 	return peers, nil
 }
+
+func (p Peer) String() string {
+	return net.JoinHostPort(p.IP.String(), strconv.Itoa(int(p.Port)))
+}

peers/peers_test.go

@@ -37,3 +37,19 @@ func TestUnmarshal(t *testing.T) {
 		assert.Equal(t, test.output, peers)
 	}
 }
+
+func TestString(t *testing.T) {
+	tests := []struct {
+		input  Peer
+		output string
+	}{
+		{
+			input:  Peer{IP: net.IP{127, 0, 0, 1}, Port: 8080},
+			output: "127.0.0.1:8080",
+		},
+	}
+	for _, test := range tests {
+		s := test.input.String()
+		assert.Equal(t, test.output, s)
+	}
+}