test: fix NewRandPort

reducing chance of bind: address already in use
ipfs · Jan 22, 2025 · a906a43 · a906a43
1 parent 84d75b7
commit a906a43
Showing 1 changed file with 8 additions and 0 deletions.
diff --git a/test/cli/harness/peering.go b/test/cli/harness/peering.go
@@ -3,6 +3,7 @@ package harness
 import (
 	"fmt"
 	"math/rand"
+	"net"
 	"testing"
 
 	"github.com/ipfs/kubo/config"
@@ -14,6 +15,13 @@ type Peering struct {
 }
 
 func NewRandPort() int {
+	if a, err := net.ResolveTCPAddr("tcp", "localhost:0"); err == nil {
+		var l *net.TCPListener
+		if l, err = net.ListenTCP("tcp", a); err == nil {
+			defer l.Close()
+			return l.Addr().(*net.TCPAddr).Port
+		}
+	}
 	n := rand.Int()
 	return 3000 + (n % 1000)
 }