controller, tests: expose bug in issue#66

This commit refactors the previously added test into a table that
clearly proves that updating the interface name of an existing
attachment actually causes the original attachment to be removed, since
this "update" is recognized by the controller as a sequence of:
- attach new interface (with the interface name specified)
- remove old interface

The first action fails, since that interface name is already present
within the system, while the second succeeds.

Signed-off-by: Miguel Duarte Barroso <mdbarroso@redhat.com>

Author: maiqueb

pkg/controller/pod_test.go

@@ -9,7 +9,7 @@ import (
 	"path"
 	"testing"
 
-	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/ginkgo/v2"
 	. "github.com/onsi/gomega"
 
 	cni100 "github.com/containernetworking/cni/pkg/types/100"
@@ -204,31 +204,15 @@ var _ = Describe("Dynamic Attachment controller", func() {
 			})
 
 			When("an update to an existing attachment occurs", func() {
-				BeforeEach(func() {
-					var err error
-
-					currentPodAttachments, err := networkSelectionElements(pod.Annotations, pod.GetNamespace())
-					Expect(err).NotTo(HaveOccurred())
-					Expect(currentPodAttachments).NotTo(BeEmpty())
+				DescribeTable("nothing happens", func(updatedNetworkSelectionElement nad.NetworkSelectionElement) {
+					Expect(updatePodNetworkSelectionElements(k8sClient, pod, updatedNetworkSelectionElement)).To(Succeed())
 
-					currentPodAttachments[0].MacRequest = "07:06:05:04:03:02"
-					var newAttachments []nad.NetworkSelectionElement
-					for i := range currentPodAttachments {
-						newAttachments = append(newAttachments, *currentPodAttachments[i])
-					}
-
-					serializedAttachments, err := json.Marshal(newAttachments)
-					Expect(err).NotTo(HaveOccurred())
-					pod.Annotations[nad.NetworkAttachmentAnnot] = string(serializedAttachments)
-
-					_, err = k8sClient.CoreV1().Pods(namespace).UpdateStatus(
+					_, err := k8sClient.CoreV1().Pods(namespace).UpdateStatus(
 						context.TODO(),
 						pod,
 						metav1.UpdateOptions{})
 					Expect(err).NotTo(HaveOccurred())
-				})
 
-				It("nothing happens", func() {
 					Consistently(func() ([]nad.NetworkStatus, error) {
 						updatedPod, err := k8sClient.CoreV1().Pods(namespace).Get(context.TODO(), podName, metav1.GetOptions{})
 						if err != nil {
@@ -240,12 +224,50 @@ var _ = Describe("Dynamic Attachment controller", func() {
 						}
 						return status, nil
 					}).Should(ConsistOf(ifaceStatus(namespace, networkName, "net0", "")))
-				})
+				},
+					Entry("when the MAC address is updated", nad.NetworkSelectionElement{
+						Name:             networkName,
+						Namespace:        namespace,
+						InterfaceRequest: "net0",
+						MacRequest:       "07:06:05:04:03:02",
+					}),
+					XEntry("when the iface name is updated", nad.NetworkSelectionElement{
+						Name:             networkName,
+						Namespace:        namespace,
+						InterfaceRequest: "newiface",
+					}, Label("issue#66")),
+				)
 			})
 		})
 	})
 })
 
+func updatePodNetworkSelectionElements(k8sClient k8sclient.Interface, pod *corev1.Pod, newAttachments ...nad.NetworkSelectionElement) error {
+	currentPodAttachments, err := networkSelectionElements(pod.Annotations, pod.GetNamespace())
+	if err != nil {
+		return err
+	} else if len(currentPodAttachments) == 0 {
+		return fmt.Errorf("no attachments ")
+	}
+
+	for i := range currentPodAttachments[1:] {
+		newAttachments = append(newAttachments, *currentPodAttachments[i])
+	}
+
+	serializedAttachments, err := json.Marshal(newAttachments)
+	if err != nil {
+		return err
+	}
+
+	pod.Annotations[nad.NetworkAttachmentAnnot] = string(serializedAttachments)
+	_, err = k8sClient.CoreV1().Pods(pod.GetNamespace()).UpdateStatus(
+		context.TODO(),
+		pod,
+		metav1.UpdateOptions{})
+
+	return err
+}
+
 func networkConfig(cmd, ifaceName, mac string) fakemultusclient.NetworkConfig {
 	const cniVersion = "1.0.0"
 	return fakemultusclient.NetworkConfig{