func TestBool(t *testing.T) {
	reset()

	ev := RegisterBoolVar(testVar, true, "")
	v, present := ev.Lookup()
	if !v {
		t.Errorf("Expected true, got %v", v)
	}
	if present {
		t.Errorf("Expected not present")
	}

	v = ev.Get()
	if !v {
		t.Errorf("Expected true, got %v", v)
	}

	_ = os.Setenv(testVar, "XXX")

	ev = RegisterBoolVar(testVar, true, "")
	v, present = ev.Lookup()
	if !v {

	v := Var{Name: name, DefaultValue: defaultValue, Description: description, Type: STRING}
	RegisterVar(v)
	return StringVar{getVar(name)}
}

// RegisterBoolVar registers a new boolean environment variable.
func RegisterBoolVar(name string, defaultValue bool, description string) BoolVar {
	v := Var{Name: name, DefaultValue: strconv.FormatBool(defaultValue), Description: description, Type: BOOL}
	RegisterVar(v)

		false,
		"If set, it allows creating inbound listeners for service ports and sidecar ingress listeners ",
	).Get()

	EnableDualStack = env.RegisterBoolVar("ISTIO_DUAL_STACK", false,
		"If true, Istio will enable the Dual Stack feature.").Get()

	EnableOptimizedServicePush = env.RegisterBoolVar("ISTIO_ENABLE_OPTIMIZED_SERVICE_PUSH", true,
		"If enabled, Istiod will not push changes on arbitrary annotation change.").Get()

		"If enabled, service entries with selectors will select pods from the cluster. "+
			"It is safe to disable it if you are quite sure you don't need this feature").Get()

	EnableK8SServiceSelectWorkloadEntries = env.RegisterBoolVar("PILOT_ENABLE_K8S_SELECT_WORKLOAD_ENTRIES", true,
		"If enabled, Kubernetes services with selectors will select workload entries with matching labels. "+