diff --git a/clientv3/integration/kv_test.go b/clientv3/integration/kv_test.go
index 4bdd5de62a6b..efaa337fd47a 100644
--- a/clientv3/integration/kv_test.go
+++ b/clientv3/integration/kv_test.go
@@ -226,6 +226,21 @@ func TestKVRange(t *testing.T) {
 				{Key: []byte("fop"), Value: nil, CreateRevision: 9, ModRevision: 9, Version: 1},
 			},
 		},
+		// range all with SortByKey, missing sorting order (ASCEND by default)
+		{
+			"a", "x",
+			0,
+			[]clientv3.OpOption{clientv3.WithSort(clientv3.SortByKey, clientv3.SortNone)},
+
+			[]*mvccpb.KeyValue{
+				{Key: []byte("a"), Value: nil, CreateRevision: 2, ModRevision: 2, Version: 1},
+				{Key: []byte("b"), Value: nil, CreateRevision: 3, ModRevision: 3, Version: 1},
+				{Key: []byte("c"), Value: nil, CreateRevision: 4, ModRevision: 6, Version: 3},
+				{Key: []byte("foo"), Value: nil, CreateRevision: 7, ModRevision: 7, Version: 1},
+				{Key: []byte("foo/abc"), Value: nil, CreateRevision: 8, ModRevision: 8, Version: 1},
+				{Key: []byte("fop"), Value: nil, CreateRevision: 9, ModRevision: 9, Version: 1},
+			},
+		},
 		// range all with SortByCreateRevision, SortDescend
 		{
 			"a", "x",
@@ -241,6 +256,21 @@ func TestKVRange(t *testing.T) {
 				{Key: []byte("a"), Value: nil, CreateRevision: 2, ModRevision: 2, Version: 1},
 			},
 		},
+		// range all with SortByCreateRevision, missing sorting order (ASCEND by default)
+		{
+			"a", "x",
+			0,
+			[]clientv3.OpOption{clientv3.WithSort(clientv3.SortByCreateRevision, clientv3.SortNone)},
+
+			[]*mvccpb.KeyValue{
+				{Key: []byte("a"), Value: nil, CreateRevision: 2, ModRevision: 2, Version: 1},
+				{Key: []byte("b"), Value: nil, CreateRevision: 3, ModRevision: 3, Version: 1},
+				{Key: []byte("c"), Value: nil, CreateRevision: 4, ModRevision: 6, Version: 3},
+				{Key: []byte("foo"), Value: nil, CreateRevision: 7, ModRevision: 7, Version: 1},
+				{Key: []byte("foo/abc"), Value: nil, CreateRevision: 8, ModRevision: 8, Version: 1},
+				{Key: []byte("fop"), Value: nil, CreateRevision: 9, ModRevision: 9, Version: 1},
+			},
+		},
 		// range all with SortByModRevision, SortDescend
 		{
 			"a", "x",