chore: upload testutil/net.go

internal/testutil/net.go

@@ -0,0 +1,24 @@
+package testutil
+
+import (
+	"net"
+	"testing"
+)
+
+func AllocOpenBindAddr(t *testing.T) string {
+	t.Helper()
+
+	listener, err := net.Listen("tcp", ":0")
+	if err != nil {
+		t.Fatalf("failed to listen: %v", err)
+	}
+	defer listener.Close()
+
+	// Get the port number from the listener
+	_, port, err := net.SplitHostPort(listener.Addr().String())
+	if err != nil {
+		t.Fatalf("failed to split host and port: %v", err)
+	}
+
+	return "127.0.0.1:" + port
+}