Add unit test for reason cache

pkg/kubelet/reason_cache_test.go

@@ -0,0 +1,69 @@
+/*
+Copyright 2016 The Kubernetes Authors All rights reserved.
+
+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 kubelet
+
+import (
+	"testing"
+
+	kubecontainer "k8s.io/kubernetes/pkg/kubelet/container"
+	"k8s.io/kubernetes/pkg/types"
+)
+
+func TestReasonCache(t *testing.T) {
+	// Create test sync result
+	syncResult := kubecontainer.PodSyncResult{}
+	results := []*kubecontainer.SyncResult{
+		// reason cache should be set for SyncResult with StartContainer action and error
+		kubecontainer.NewSyncResult(kubecontainer.StartContainer, "container_1"),
+		// reason cache should not be set for SyncResult with StartContainer action but without error
+		kubecontainer.NewSyncResult(kubecontainer.StartContainer, "container_2"),
+		// reason cache should not be set for SyncResult with other actions
+		kubecontainer.NewSyncResult(kubecontainer.KillContainer, "container_3"),
+	}
+	results[0].Fail(kubecontainer.ErrRunContainer, "message_1")
+	results[2].Fail(kubecontainer.ErrKillContainer, "message_3")
+	syncResult.AddSyncResult(results...)
+	uid := types.UID("pod_1")
+
+	reasonCache := NewReasonCache()
+	reasonCache.Update(uid, syncResult)
+	assertReasonInfo(t, reasonCache, uid, results[0], true)
+	assertReasonInfo(t, reasonCache, uid, results[1], false)
+	assertReasonInfo(t, reasonCache, uid, results[2], false)
+
+	reasonCache.Remove(uid, results[0].Target.(string))
+	assertReasonInfo(t, reasonCache, uid, results[0], false)
+}
+
+func assertReasonInfo(t *testing.T, cache *ReasonCache, uid types.UID, result *kubecontainer.SyncResult, found bool) {
+	name := result.Target.(string)
+	actualReason, actualMessage, ok := cache.Get(uid, name)
+	if ok && !found {
+		t.Fatalf("unexpected cache hit: %v, %q", actualReason, actualMessage)
+	}
+	if !ok && found {
+		t.Fatalf("corresponding reason info not found")
+	}
+	if !found {
+		return
+	}
+	reason := result.Error
+	message := result.Message
+	if actualReason != reason || actualMessage != message {
+		t.Errorf("expected %v %q, got %v %q", reason, message, actualReason, actualMessage)
+	}
+}