diff --git a/packet-manager_test.go b/packet-manager_test.go
index 08df054..7e187d9 100644
--- a/packet-manager_test.go
+++ b/packet-manager_test.go
@@ -2,6 +2,7 @@
 
 import (
 	"encoding"
+	"fmt"
 	"sync"
 	"testing"
 	"time"
@@ -89,6 +90,19 @@
 	s.close()
 }
 
+func (p sshFxpRemovePacket) String() string {
+	return fmt.Sprintf("RmPct:%d", p.ID)
+}
+func (p sshFxpOpenPacket) String() string {
+	return fmt.Sprintf("OpPct:%d", p.ID)
+}
+func (p sshFxpWritePacket) String() string {
+	return fmt.Sprintf("WrPct:%d", p.ID)
+}
+func (p sshFxpClosePacket) String() string {
+	return fmt.Sprintf("ClPct:%d", p.ID)
+}
+
 // Test what happens when the pool processes a close packet on a file that it
 // is still reading from.
 func TestCloseOutOfOrder(t *testing.T) {