diff --git a/LanguageFeatures/FinalizationRegistry/Finalizer/Finalizer_A01_t01.dart b/LanguageFeatures/FinalizationRegistry/Finalizer/Finalizer_A01_t01.dart
index 7612042..3b00cfc 100644
--- a/LanguageFeatures/FinalizationRegistry/Finalizer/Finalizer_A01_t01.dart
+++ b/LanguageFeatures/FinalizationRegistry/Finalizer/Finalizer_A01_t01.dart
@@ -10,31 +10,23 @@
 /// and will run in that zone when called.
 ///
 /// @description Checks that finalizer object can be created and its callback
-/// will run when attached object becomes inaccessible.
+/// will not run if attached object is still accessible.
 /// @author iarkh@unipro.ru
 
 import "../gc_utils_lib.dart";
 import "../../../Utils/expect.dart";
 
+class A {}
 int called = 0;
 
 final Finalizer finalizer = Finalizer((_) {
   called++;
 });
 
-class A {}
-
-void test() {
+main() {
+  A a = A();
   finalizer.attach(A(), null);
   Expect.equals(0, called);
-}
-
-main() {
-  test();
-  triggerGc();
-  Expect.equals(1, called);
-  triggerGc();
-  Expect.equals(1, called);
-  triggerGc();
-  Expect.equals(1, called);
+  triggerGcWithDelay();
+  Expect.equals(0, called);
 }
diff --git a/LanguageFeatures/FinalizationRegistry/Finalizer/Finalizer_A01_t02.dart b/LanguageFeatures/FinalizationRegistry/Finalizer/Finalizer_A01_t02.dart
index 619f039..9067d6a 100644
--- a/LanguageFeatures/FinalizationRegistry/Finalizer/Finalizer_A01_t02.dart
+++ b/LanguageFeatures/FinalizationRegistry/Finalizer/Finalizer_A01_t02.dart
@@ -24,11 +24,6 @@
 
 main() {
   finalizer.attach(Object(), null);
-  Expect.equals(0, called);
-  triggerGc();
-  Expect.equals(1, called);
-  triggerGc();
-  Expect.equals(1, called);
-  triggerGc();
+  triggerGcWithDelay();
   Expect.equals(1, called);
 }
diff --git a/LanguageFeatures/FinalizationRegistry/Finalizer/Finalizer_A01_t03.dart b/LanguageFeatures/FinalizationRegistry/Finalizer/Finalizer_A01_t03.dart
index f2e8867..e9e6087 100644
--- a/LanguageFeatures/FinalizationRegistry/Finalizer/Finalizer_A01_t03.dart
+++ b/LanguageFeatures/FinalizationRegistry/Finalizer/Finalizer_A01_t03.dart
@@ -10,7 +10,7 @@
 /// and will run in that zone when called.
 ///
 /// @description Checks that finalizer object can be created and its callback
-/// will never run if attached object is accessible.
+/// will run when attached object becomes inaccessible.
 /// @author iarkh@unipro.ru
 
 import "../gc_utils_lib.dart";
@@ -22,23 +22,11 @@
   called++;
 });
 
-class A {}
-
 main() {
-  A? a = A();
-  finalizer.attach(a, null);
-  Expect.equals(0, called);
-  triggerGc();
-  Expect.equals(0, called);
-  triggerGc();
-  Expect.equals(0, called);
-  triggerGc();
-  Expect.equals(0, called);
-  a = null;
-  triggerGc();
-  Expect.equals(1, called);
-  triggerGc();
-  Expect.equals(1, called);
-  triggerGc();
+  Object? obj = Object();
+  finalizer.attach(obj, null);
+  print(obj);
+  obj = null;
+  triggerGcWithDelay();
   Expect.equals(1, called);
 }
diff --git a/LanguageFeatures/FinalizationRegistry/Finalizer/Finalizer_A01_t04.dart b/LanguageFeatures/FinalizationRegistry/Finalizer/Finalizer_A01_t04.dart
index 4ad69c9..b7a4271 100644
--- a/LanguageFeatures/FinalizationRegistry/Finalizer/Finalizer_A01_t04.dart
+++ b/LanguageFeatures/FinalizationRegistry/Finalizer/Finalizer_A01_t04.dart
@@ -22,21 +22,15 @@
   called++;
 });
 
-test(obj) {
+test() {
+  Object obj = Object();
   finalizer.attach(obj, null);
+  triggerGcWithDelay();
   Expect.equals(0, called);
-  triggerGc();
-  Expect.equals(0, called);
-  print(obj);
 }
 
 main() {
-  test(Object());
-  Expect.isTrue(called == 0 || called == 1);
-  triggerGc();
-  Expect.equals(1, called);
-  triggerGc();
-  Expect.equals(1, called);
-  triggerGc();
+  test();
+  triggerGcWithDelay();
   Expect.equals(1, called);
 }
diff --git a/LanguageFeatures/FinalizationRegistry/gc_utils_lib.dart b/LanguageFeatures/FinalizationRegistry/gc_utils_lib.dart
index d4f34e9..7967012 100644
--- a/LanguageFeatures/FinalizationRegistry/gc_utils_lib.dart
+++ b/LanguageFeatures/FinalizationRegistry/gc_utils_lib.dart
@@ -32,3 +32,13 @@
   _triggerGC();
 }
 
+void triggerGcWithDelay() async {
+  triggerGc();
+  await Future.delayed(Duration(milliseconds: 1));
+  triggerGc();
+  await Future.delayed(Duration(milliseconds: 1));
+  triggerGc();
+  await Future.delayed(Duration(milliseconds: 1));
+  triggerGc();
+}
+