func SetForTest[T any](t Failer, vv *T, v T) {
	old := *vv
	*vv = v
	t.Cleanup(func() {
		*vv = old
	})
}

// SetEnvForTest sets an environment variable for the duration of a test, then resets it once the test is complete.
func SetEnvForTest(t Failer, k, v string) {
	old, oldset := os.LookupEnv(k)
	if err := os.Setenv(k, v); err != nil {
		t.Fatal(err)

import "runtime"

var finalized bool
var err string

type HeapObj [8]int64

const filler int64 = 0x123456789abcdef0

func (h *HeapObj) init() {
	for i := 0; i < len(*h); i++ {
		h[i] = filler
	}
}
func (h *HeapObj) check() {
	for i := 0; i < len(*h); i++ {
		if h[i] != filler {
			err = "filler overwritten"
		}
	}
}

func gc(shouldFinalize bool) {
	runtime.GC()
	runtime.GC()

	"istio.io/istio/pkg/test"
)

func NewAdsTest(t test.Failer, conn *grpc.ClientConn) *AdsTest {
	return NewXdsTest(t, conn, func(conn *grpc.ClientConn) (DiscoveryClient, error) {
		xds := discovery.NewAggregatedDiscoveryServiceClient(conn)
		return xds.StreamAggregatedResources(context.Background())
	})
}

func NewSdsTest(t test.Failer, conn *grpc.ClientConn) *AdsTest {

		},
	}
	for _, test := range tests {
		hashValue := rand.Uint64()
		t.Run(test.name, func(t *testing.T) {
			dealer, err := NewDealer(test.deckSize, test.handSize)
			if err != nil {
				t.Errorf("fail to create Dealer: %v", err)
				return
			}
			hand := make([]int, 0)
			hand = dealer.DealIntoHand(hashValue, hand)

			// check cards number
			if len(hand) != int(test.handSize) {

		if err != nil {
			t.Fatalf("unexpected error from Dial with %v connections: %v", len(dialed), err)
		}
		dialed = append(dialed, c)
		if testing.Verbose() && len(dialed)%(1<<12) == 0 {
			t.Logf("dialed %d connections", len(dialed))
		}
	}
	t.Logf("dialed %d connections", len(dialed))

	// Now that all of the ports are in use, dialing another should fail due
	// to port exhaustion, which (for POSIX-like socket APIs) should return

	WaitForConfigOrFail(t test.Failer, accept func(*admin.ConfigDump) (bool, error), options ...retry.Option)

	// Clusters for the Envoy instance
	Clusters() (*admin.Clusters, error)
	ClustersOrFail(t test.Failer) *admin.Clusters

	// Listeners for the Envoy instance
	Listeners() (*admin.Listeners, error)
	ListenersOrFail(t test.Failer) *admin.Listeners

	// Logs returns the logs for the sidecar container

package main

import "runtime"

var finalized bool
var err string

type HeapObj [8]int64

const filler int64 = 0x123456789abcdef0

func (h *HeapObj) init() {
	for i := 0; i < len(*h); i++ {
		h[i] = filler
	}
}
func (h *HeapObj) check() {
	for i := 0; i < len(*h); i++ {
		if h[i] != filler {
			err = "filler overwritten"
		}
	}
}

type StackObj struct {
	h *HeapObj
}

	}
}

// Error asserts the provided err is non-nil
func Error(t test.Failer, err error) {
	t.Helper()
	if err == nil {
		t.Fatal("expected error but got nil")
	}
}

// NoError asserts the provided err is nil
func NoError(t test.Failer, err error) {
	t.Helper()
	if err != nil {
		t.Fatalf("expected no error but got: %v", err)
	}
}

	return int(math.Ceil(math.Log2(float64(deckSize)) * float64(handSize)))
}

// Dealer contains some necessary parameters and provides some methods for shuffle sharding.
// Dealer is thread-safe.
type Dealer struct {
	deckSize int
	handSize int
}

// NewDealer will create a Dealer with the given deckSize and handSize, will return error when
// deckSize or handSize is invalid as below.

}

// EvaluateOrFail calls Evaluate and fails tests if it returns error.
func EvaluateOrFail(t test.Failer, tpl string, data any) string {
	t.Helper()
	s, err := Evaluate(tpl, data)
	if err != nil {
		t.Fatalf("tmpl.EvaluateOrFail: %v", err)
	}
	return s
}

func EvaluateFileOrFail(t test.Failer, filePath string, data any) string {
	t.Helper()
	s, err := EvaluateFile(filePath, data)
	if err != nil {