Dump the stacktrace while an error occurs

Signed-off-by: Jiatong Wang <[email protected]>

Author: Jiatong Wang

test/e2e/framework/util.go

@@ -32,6 +32,7 @@ import (
 	"path"
 	"path/filepath"
 	"regexp"
+	"runtime/debug"
 	"sort"
 	"strconv"
 	"strings"
@@ -1359,16 +1360,28 @@ func RandomSuffix() string {
 
 // ExpectEqual expects the specified two are the same, otherwise an exception raises
 func ExpectEqual(actual interface{}, extra interface{}, explain ...interface{}) {
+	if isEqual, _ := gomega.Equal(extra).Match(actual); !isEqual {
+		e2elog.Logf("Unexpected unequal occurred: %v and %v", actual, extra)
+		debug.PrintStack()
+	}
 	gomega.Expect(actual).To(gomega.Equal(extra), explain...)
 }
 
 // ExpectNotEqual expects the specified two are not the same, otherwise an exception raises
 func ExpectNotEqual(actual interface{}, extra interface{}, explain ...interface{}) {
+	if isEqual, _ := gomega.Equal(extra).Match(actual); isEqual {
+		e2elog.Logf("Expect to be unequal: %v and %v", actual, extra)
+		debug.PrintStack()
+	}
 	gomega.Expect(actual).NotTo(gomega.Equal(extra), explain...)
 }
 
 // ExpectError expects an error happens, otherwise an exception raises
 func ExpectError(err error, explain ...interface{}) {
+	if err == nil {
+		e2elog.Logf("Expect error to occur.")
+		debug.PrintStack()
+	}
 	gomega.Expect(err).To(gomega.HaveOccurred(), explain...)
 }
 
@@ -1382,6 +1395,7 @@ func ExpectNoError(err error, explain ...interface{}) {
 func ExpectNoErrorWithOffset(offset int, err error, explain ...interface{}) {
 	if err != nil {
 		e2elog.Logf("Unexpected error occurred: %v", err)
+		debug.PrintStack()
 	}
 	gomega.ExpectWithOffset(1+offset, err).NotTo(gomega.HaveOccurred(), explain...)
 }
@@ -1396,6 +1410,9 @@ func ExpectNoErrorWithRetries(fn func() error, maxRetries int, explain ...interf
 		}
 		e2elog.Logf("(Attempt %d of %d) Unexpected error occurred: %v", i+1, maxRetries, err)
 	}
+	if err != nil {
+		debug.PrintStack()
+	}
 	gomega.ExpectWithOffset(1, err).NotTo(gomega.HaveOccurred(), explain...)
 }