klog.V(3).Infof("Setting up a downwardAPI volume %v for pod %v/%v at %v", b.volName, b.pod.Namespace, b.pod.Name, dir)
	// Wrap EmptyDir. Here we rely on the idempotency of the wrapped plugin to avoid repeatedly mounting
	wrapped, err := b.plugin.host.NewWrapperMounter(b.volName, wrappedVolumeSpec(), b.pod, *b.opts)
	if err != nil {

			if actual != tc.want {
				t.Fatalf("Unexpected result.\nExpected:\n%v\nActual:\n%v", tc.want, actual)
			}
			t.Run("idempotency", func(t *testing.T) {
				actual := appendMultusNetwork(actual, "istio-cni")
				if actual != tc.want {
					t.Fatalf("Function is not idempotent.\nExpected:\n%v\nActual:\n%v", tc.want, actual)
				}
			})
		})
	}
}

func Test_updateClusterEnvs(t *testing.T) {

	pod := req.pod.DeepCopy()
	prevStatus := injectionStatus(pod)
	if prevStatus == nil {
		return req.pod
	}
	// We found a previous status annotation. Possibly we are re-injecting the pod
	// To ensure idempotency, remove our injected containers first
	for _, c := range prevStatus.Containers {
		pod.Spec.Containers = modifyContainers(pod.Spec.Containers, c, Remove)
	}
	for _, c := range prevStatus.InitContainers {

			existingKubeConfig: invalidConfig,
			kubeConfig:         invalidConfig,
			expectedError:      true,
		},
		{ // if KubeConfig is equal to the existingKubeConfig - refers to the same cluster -, use the existing (Test idempotency)
			name:               "KubeConfig refers to the same cluster",
			existingKubeConfig: config,
			kubeConfig:         config,
		},

	parsedContainers.InitContainers = parser(InitContainers, unMarshalledStatus)

	return parsedContainers
}

// reinsertOverrides applies the containers listed in OverrideAnnotation to a pod. This is to achieve
// idempotency by handling an edge case where an injection template is modifying a container already
// present in the pod spec. In these cases, the logic to strip injected containers would remove the

	{"slow.input", "slow.golden", idempotent},
	{"complit.input", "complit.x", export},
	{"go2numbers.input", "go2numbers.golden", idempotent},
	{"go2numbers.input", "go2numbers.norm", normNumber | idempotent},
	{"generics.input", "generics.golden", idempotent | allowTypeParams},
	{"gobuild1.input", "gobuild1.golden", idempotent},
	{"gobuild2.input", "gobuild2.golden", idempotent},
	{"gobuild3.input", "gobuild3.golden", idempotent},

	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/types"
)

// Volume represents a directory used by pods or hosts on a node. All method
// implementations of methods in the volume interface must be idempotent.
type Volume interface {
	// GetPath returns the path to which the volume should be mounted for the
	// pod.
	GetPath() string

	// MetricsProvider embeds methods for exposing metrics (e.g.

    // Replace the outer involutions output with inner's input.
    return argumentOp->getOperand(0);
  }

  return {};
}

}  // namespace detail

// This class adds property that the operation is idempotent.
// This means a unary to unary operation "f" that satisfies f(f(x)) = f(x),
// or a binary operation "g" that satisfies g(x, x) = x.
template <typename ConcreteType>

	if ed.mounter == nil {
		return fmt.Errorf("memory storage requested, but mounter is nil")
	}
	if err := ed.setupDir(dir); err != nil {
		return err
	}
	// Make SetUp idempotent.
	medium, isMnt, _, err := ed.mountDetector.GetMountMedium(dir, ed.medium)
	if err != nil {
		return err
	}
	// If the directory is a mountpoint with medium memory, there is no

				log.Debugf("ignoring error deleting optional iptables rule: %v", err)
			}
		}
	}
	return errors.Join(delErrs...)
}

// Setup iptables rules for in-pod mode. Ideally this should be an idempotent function.
// NOTE that this expects to be run from within the pod network namespace!
func (cfg *IptablesConfigurator) CreateInpodRules(hostProbeSNAT, hostProbeV6SNAT *netip.Addr) error {
	// Append our rules here