Add sidecar-controller unit tests

Signed-off-by: Grant Griffiths <grant@portworx.com>

pkg/sidecar-controller/snapshot_controller_test.go

@@ -0,0 +1,91 @@
+/*
+Copyright 2019 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 sidecar_controller
+
+import (
+	"testing"
+
+	crdv1 "github.com/kubernetes-csi/external-snapshotter/pkg/apis/volumesnapshot/v1beta1"
+	"github.com/kubernetes-csi/external-snapshotter/pkg/utils"
+	"k8s.io/client-go/tools/cache"
+)
+
+var deletionPolicy = crdv1.VolumeSnapshotContentDelete
+
+func storeVersion(t *testing.T, prefix string, c cache.Store, version string, expectedReturn bool) {
+	content := newContent("contentName", "snapuid1-1", "snap1-1", "sid1-1", classGold, "", "pv-handle-1-1", deletionPolicy, nil, nil, false, nil)
+	content.ResourceVersion = version
+	ret, err := utils.StoreObjectUpdate(c, content, "content")
+	if err != nil {
+		t.Errorf("%s: expected storeObjectUpdate to succeed, got: %v", prefix, err)
+	}
+	if expectedReturn != ret {
+		t.Errorf("%s: expected storeObjectUpdate to return %v, got: %v", prefix, expectedReturn, ret)
+	}
+
+	// find the stored version
+
+	contentObj, found, err := c.GetByKey("contentName")
+	if err != nil {
+		t.Errorf("expected content 'contentName' in the cache, got error instead: %v", err)
+	}
+	if !found {
+		t.Errorf("expected content 'contentName' in the cache but it was not found")
+	}
+	content, ok := contentObj.(*crdv1.VolumeSnapshotContent)
+	if !ok {
+		t.Errorf("expected content in the cache, got different object instead: %#v", contentObj)
+	}
+
+	if ret {
+		if content.ResourceVersion != version {
+			t.Errorf("expected content with version %s in the cache, got %s instead", version, content.ResourceVersion)
+		}
+	} else {
+		if content.ResourceVersion == version {
+			t.Errorf("expected content with version other than %s in the cache, got %s instead", version, content.ResourceVersion)
+		}
+	}
+}
+
+// TestControllerCache tests func storeObjectUpdate()
+func TestControllerCache(t *testing.T) {
+	// Cache under test
+	c := cache.NewStore(cache.DeletionHandlingMetaNamespaceKeyFunc)
+
+	// Store new PV
+	storeVersion(t, "Step1", c, "1", true)
+	// Store the same PV
+	storeVersion(t, "Step2", c, "1", true)
+	// Store newer PV
+	storeVersion(t, "Step3", c, "2", true)
+	// Store older PV - simulating old "PV updated" event or periodic sync with
+	// old data
+	storeVersion(t, "Step4", c, "1", false)
+	// Store newer PV - test integer parsing ("2" > "10" as string,
+	// while 2 < 10 as integers)
+	storeVersion(t, "Step5", c, "10", true)
+}
+
+func TestControllerCacheParsingError(t *testing.T) {
+	c := cache.NewStore(cache.DeletionHandlingMetaNamespaceKeyFunc)
+	// There must be something in the cache to compare with
+	storeVersion(t, "Step1", c, "1", true)
+	content := newContent("contentName", "snapuid1-1", "snap1-1", "sid1-1", classGold, "", "pv-handle-1-1", deletionPolicy, nil, nil, false, nil)
+	content.ResourceVersion = "xxx"
+	_, err := utils.StoreObjectUpdate(c, content, "content")
+	if err == nil {
+		t.Errorf("Expected parsing error, got nil instead")
+	}
+}