Add detailed output for traceflow tests (#5779)

Signed-off-by: Hang Yan <[email protected]>

go.mod

@@ -21,6 +21,7 @@ require (
 	github.com/containernetworking/cni v1.1.1
 	github.com/containernetworking/plugins v1.1.1
 	github.com/coreos/go-iptables v0.7.0
+	github.com/davecgh/go-spew v1.1.1
 	github.com/fsnotify/fsnotify v1.7.0
 	github.com/gammazero/deque v0.1.2
 	github.com/go-logr/logr v1.4.1
@@ -121,7 +122,6 @@ require (
 	github.com/contiv/libovsdb v0.0.0-20170227191248-d0061a53e358 // indirect
 	github.com/coreos/go-semver v0.3.0 // indirect
 	github.com/coreos/go-systemd/v22 v22.3.2 // indirect
-	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/elazarl/goproxy v0.0.0-20190911111923-ecfe977594f1 // indirect
 	github.com/emicklei/go-restful/v3 v3.10.1 // indirect
 	github.com/evanphx/json-patch v4.12.0+incompatible // indirect

test/e2e/traceflow_test.go

@@ -23,6 +23,7 @@ import (
 	"testing"
 	"time"
 
+	"github.com/davecgh/go-spew/spew"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 	corev1 "k8s.io/api/core/v1"
@@ -2557,7 +2558,7 @@ func runTestTraceflow(t *testing.T, data *TestData, tc testcase) {
 			pktCap.TransportHeader.ICMP = &v1beta1.ICMPEchoRequestHeader{}
 		}
 		if !reflect.DeepEqual(tc.expectedPktCap, pktCap) {
-			t.Fatalf("Captured packet should be: %+v, but got: %+v", tc.expectedPktCap, tf.Status.CapturedPacket)
+			t.Fatalf("Captured packet should be: %s, but got: %s", spew.Sdump(tc.expectedPktCap), spew.Sdump(tf.Status.CapturedPacket))
 		}
 	}
 }