extend test and update log msg

pkg/cluster/cluster.go

@@ -672,7 +672,7 @@ func (c *Cluster) Update(oldSpec, newSpec *acidv1.Postgresql) error {
 	// Volume
 	if oldSpec.Spec.Size != newSpec.Spec.Size {
 		c.logVolumeChanges(oldSpec.Spec.Volume, newSpec.Spec.Volume)
-		c.logger.Debugf("syncing volumes using %q resize mode", c.OpConfig.StorageResizeMode)
+		c.logger.Debugf("syncing volumes using %q storage resize mode", c.OpConfig.StorageResizeMode)
 		if c.OpConfig.StorageResizeMode == "pvc" {
 			if err := c.syncVolumeClaims(); err != nil {
 				c.logger.Errorf("could not sync persistent volume claims: %v", err)

pkg/cluster/sync.go

@@ -57,7 +57,7 @@ func (c *Cluster) Sync(newSpec *acidv1.Postgresql) error {
 		return err
 	}
 
-	c.logger.Debugf("syncing volumes using %q resize mode", c.OpConfig.StorageResizeMode)
+	c.logger.Debugf("syncing volumes using %q storage resize mode", c.OpConfig.StorageResizeMode)
 	if c.OpConfig.StorageResizeMode == "pvc" {
 		if err = c.syncVolumeClaims(); err != nil {
 			err = fmt.Errorf("could not sync persistent volume claims: %v", err)

pkg/cluster/volumes_test.go

@@ -8,6 +8,7 @@ import (
 	v1 "k8s.io/api/core/v1"
 	"k8s.io/apimachinery/pkg/api/resource"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/labels"
 
 	"github.com/stretchr/testify/assert"
 	acidv1 "github.com/zalando/postgres-operator/pkg/apis/acid.zalan.do/v1"
@@ -32,7 +33,7 @@ func TestResizeVolumeClaim(t *testing.T) {
 	namespace := "default"
 	newVolumeSize := "2Gi"
 
-	// new cluster with pvc resize mode and configured labels
+	// new cluster with pvc storage resize mode and configured labels
 	var cluster = New(
 		Config{
 			OpConfig: config.Config{
@@ -50,7 +51,7 @@ func TestResizeVolumeClaim(t *testing.T) {
 	filterLabels := cluster.labelsSet(false)
 
 	// define and create PVCs for 1Gi volumes
-	parsedStorage, err := resource.ParseQuantity("1Gi")
+	storage1Gi, err := resource.ParseQuantity("1Gi")
 	assert.NoError(t, err)
 
 	pvcList := &v1.PersistentVolumeClaimList{
@@ -64,7 +65,7 @@ func TestResizeVolumeClaim(t *testing.T) {
 				Spec: v1.PersistentVolumeClaimSpec{
 					Resources: v1.ResourceRequirements{
 						Requests: v1.ResourceList{
-							v1.ResourceStorage: parsedStorage,
+							v1.ResourceStorage: storage1Gi,
 						},
 					},
 				},
@@ -78,7 +79,21 @@ func TestResizeVolumeClaim(t *testing.T) {
 				Spec: v1.PersistentVolumeClaimSpec{
 					Resources: v1.ResourceRequirements{
 						Requests: v1.ResourceList{
-							v1.ResourceStorage: parsedStorage,
+							v1.ResourceStorage: storage1Gi,
+						},
+					},
+				},
+			},
+			{
+				ObjectMeta: metav1.ObjectMeta{
+					Name:      constants.DataVolumeName + "-" + clusterName + "-2-0",
+					Namespace: namespace,
+					Labels:    labels.Set{},
+				},
+				Spec: v1.PersistentVolumeClaimSpec{
+					Resources: v1.ResourceRequirements{
+						Requests: v1.ResourceList{
+							v1.ResourceStorage: storage1Gi,
 						},
 					},
 				},
@@ -96,10 +111,12 @@ func TestResizeVolumeClaim(t *testing.T) {
 	pvcs, err := cluster.listPersistentVolumeClaims()
 	assert.NoError(t, err)
 
-	if len(pvcs) != len(pvcList.Items) {
+	// check if listPersistentVolumeClaims returns only the PVCs matching the filter
-		t.Errorf("%s: could not find all PVCs, got %v, expected %v", testName, len(pvcs), len(pvcList.Items))
+	if len(pvcs) != len(pvcList.Items)-1 {
+		t.Errorf("%s: could not find all PVCs, got %v, expected %v", testName, len(pvcs), len(pvcList.Items)-1)
 	}
 
+	// check if PVCs were correctly resized
 	for _, pvc := range pvcs {
 		newStorageSize := quantityToGigabyte(pvc.Spec.Resources.Requests[v1.ResourceStorage])
 		expectedQuantity, err := resource.ParseQuantity(newVolumeSize)
@@ -109,6 +126,15 @@ func TestResizeVolumeClaim(t *testing.T) {
 			t.Errorf("%s: resizing failed, got %v, expected %v", testName, newStorageSize, expectedSize)
 		}
 	}
+
+	// check if other PVC was not resized
+	pvc2, err := cluster.KubeClient.PersistentVolumeClaims(namespace).Get(context.TODO(), constants.DataVolumeName+"-"+clusterName+"-2-0", metav1.GetOptions{})
+	assert.NoError(t, err)
+	unchangedSize := quantityToGigabyte(pvc2.Spec.Resources.Requests[v1.ResourceStorage])
+	expectedSize := quantityToGigabyte(storage1Gi)
+	if unchangedSize != expectedSize {
+		t.Errorf("%s: volume size changed, got %v, expected %v", testName, unchangedSize, expectedSize)
+	}
 }
 
 func TestQuantityToGigabyte(t *testing.T) {