Add tests

Kubernetes-commit: fc8b4657c18a6e58b2587060ad3c862d3d2ae262

util/workqueue/testing/queue.go

@@ -0,0 +1,53 @@
+/*
+Copyright 2022 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package testing
+
+import (
+	"time"
+
+	"k8s.io/client-go/util/workqueue"
+)
+
+// SpyWorkQueue implements a work queue and adds the ability to inspect processed
+// items for testing purposes.
+type SpyWorkQueue struct {
+	workqueue.RateLimitingInterface
+	items []SpyQueueItem
+}
+
+// SpyQueueItem represents an item that was being processed.
+type SpyQueueItem struct {
+	Key interface{}
+	// Delay represents the delayed duration if and only if AddAfter was invoked.
+	Delay time.Duration
+}
+
+// AddAfter is like workqueue.RateLimitingInterface.AddAfter but records the
+// added key and delay internally.
+func (f *SpyWorkQueue) AddAfter(key interface{}, delay time.Duration) {
+	f.items = append(f.items, SpyQueueItem{
+		Key:   key,
+		Delay: delay,
+	})
+
+	f.RateLimitingInterface.AddAfter(key, delay)
+}
+
+// GetItems returns all items that were recorded.
+func (f *SpyWorkQueue) GetItems() []SpyQueueItem {
+	return f.items
+}