#1260. WeakReference tests added
diff --git a/LanguageFeatures/FinalizationRegistry/weak_reference_target_t01.dart b/LanguageFeatures/FinalizationRegistry/weak_reference_target_t01.dart
new file mode 100644
index 0000000..3e0bbcc
--- /dev/null
+++ b/LanguageFeatures/FinalizationRegistry/weak_reference_target_t01.dart
@@ -0,0 +1,36 @@
+// Copyright (c) 2022, the Dart project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+/// @assertion target property
+/// T? target
+/// The current object weakly referenced by this, if any.
+///
+/// The value is either the object supplied in the constructor, or null if the
+/// weak reference has been cleared.
+///
+/// @description Check that the value of this property value is either the
+/// object supplied in the constructor, or null if the weak reference has been
+/// cleared
+/// @author sgrekhov@unipro.ru
+
+import "gc_utils_lib.dart";
+import "../../Utils/expect.dart";
+
+class C {
+ int id;
+ C(this.id);
+}
+
+main() async {
+ C? c = C(42);
+ WeakReference<C> wr = WeakReference(c);
+ Expect.equals(c, wr.target);
+ triggerGc();
+ await Future.delayed(Duration(milliseconds: 1));
+ Expect.equals(c, wr.target);
+ c = null;
+ triggerGc();
+ await Future.delayed(Duration(milliseconds: 1));
+ Expect.isNull(wr.target);
+}
diff --git a/LanguageFeatures/FinalizationRegistry/weak_reference_target_t02.dart b/LanguageFeatures/FinalizationRegistry/weak_reference_target_t02.dart
new file mode 100644
index 0000000..c487816
--- /dev/null
+++ b/LanguageFeatures/FinalizationRegistry/weak_reference_target_t02.dart
@@ -0,0 +1,37 @@
+// Copyright (c) 2022, the Dart project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+/// @assertion target property
+/// T? target
+/// The current object weakly referenced by this, if any.
+///
+/// The value is either the object supplied in the constructor, or null if the
+/// weak reference has been cleared.
+///
+/// @description Check that the value of this property value is either the
+/// object supplied in the constructor, or null if the weak reference has been
+/// cleared
+/// @author sgrekhov@unipro.ru
+
+import "gc_utils_lib.dart";
+import "../../Utils/expect.dart";
+
+class C {
+ int id;
+ C(this.id);
+}
+
+main() async {
+ List<C> refs = List.filled(5, C(42), growable: true);
+
+ WeakReference<C> wr = WeakReference(refs[0]);
+ Expect.equals(refs[0], wr.target);
+ triggerGc();
+ await Future.delayed(Duration(milliseconds: 1));
+ Expect.equals(refs[1], wr.target);
+ refs.clear();
+ triggerGc();
+ await Future.delayed(Duration(milliseconds: 1));
+ Expect.isNull(wr.target);
+}
diff --git a/LanguageFeatures/FinalizationRegistry/weak_reference_target_t03.dart b/LanguageFeatures/FinalizationRegistry/weak_reference_target_t03.dart
new file mode 100644
index 0000000..3f5ba47
--- /dev/null
+++ b/LanguageFeatures/FinalizationRegistry/weak_reference_target_t03.dart
@@ -0,0 +1,37 @@
+// Copyright (c) 2022, the Dart project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+/// @assertion target property
+/// T? target
+/// The current object weakly referenced by this, if any.
+///
+/// The value is either the object supplied in the constructor, or null if the
+/// weak reference has been cleared.
+///
+/// @description Check that the value of this property value is either the
+/// object supplied in the constructor, or null if the weak reference has been
+/// cleared
+/// @author sgrekhov@unipro.ru
+
+import "gc_utils_lib.dart";
+import "../../Utils/expect.dart";
+
+class C {
+ int id;
+ C(this.id);
+}
+
+C? c = C(42);
+
+main() async {
+ WeakReference<C> wr = WeakReference(c!);
+ Expect.equals(c, wr.target);
+ triggerGc();
+ await Future.delayed(Duration(milliseconds: 1));
+ Expect.equals(c, wr.target);
+ c = null;
+ triggerGc();
+ await Future.delayed(Duration(milliseconds: 1));
+ Expect.isNull(wr.target);
+}
diff --git a/LanguageFeatures/FinalizationRegistry/weak_reference_target_t04.dart b/LanguageFeatures/FinalizationRegistry/weak_reference_target_t04.dart
new file mode 100644
index 0000000..ae3c716
--- /dev/null
+++ b/LanguageFeatures/FinalizationRegistry/weak_reference_target_t04.dart
@@ -0,0 +1,39 @@
+// Copyright (c) 2022, the Dart project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+/// @assertion target property
+/// T? target
+/// The current object weakly referenced by this, if any.
+///
+/// The value is either the object supplied in the constructor, or null if the
+/// weak reference has been cleared.
+///
+/// @description Check that the value of this property value is either the
+/// object supplied in the constructor, or null if the weak reference has been
+/// cleared
+/// @author sgrekhov@unipro.ru
+
+import "gc_utils_lib.dart";
+import "../../Utils/expect.dart";
+
+class C {
+ int id;
+ C(this.id);
+}
+
+main() async {
+ C? c = C(42);
+ dynamic d = c;
+ WeakReference<C> wr = WeakReference(c);
+ Expect.equals(c, wr.target);
+ c = null;
+ triggerGc();
+ await Future.delayed(Duration(milliseconds: 1));
+ Expect.isNotNull(wr.target);
+ Expect.equals(d, wr.target);
+ d = 42;
+ triggerGc();
+ await Future.delayed(Duration(milliseconds: 1));
+ Expect.isNull(wr.target);
+}
diff --git a/LanguageFeatures/FinalizationRegistry/weak_reference_target_t05.dart b/LanguageFeatures/FinalizationRegistry/weak_reference_target_t05.dart
new file mode 100644
index 0000000..1ad3027
--- /dev/null
+++ b/LanguageFeatures/FinalizationRegistry/weak_reference_target_t05.dart
@@ -0,0 +1,48 @@
+// Copyright (c) 2022, the Dart project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+/// @assertion target property
+/// T? target
+/// The current object weakly referenced by this, if any.
+///
+/// The value is either the object supplied in the constructor, or null if the
+/// weak reference has been cleared.
+///
+/// @description Check that the value of this property value is either the
+/// object supplied in the constructor, or null if the weak reference has been
+/// cleared
+/// @author sgrekhov@unipro.ru
+
+import "dart:async";
+import "gc_utils_lib.dart";
+import "../../Utils/expect.dart";
+
+class C {
+ int id;
+ C(this.id);
+}
+
+main() async {
+ C? c1 = C(42);
+ WeakReference<C> wr = WeakReference(c1);
+ asyncStart();
+ Future<C?>.delayed(Duration(milliseconds: 1), () => c1).then((C? c2) async {
+ Expect.isNotNull(wr.target);
+ Expect.equals(c1, wr.target);
+ triggerGc();
+ await Future.delayed(Duration(milliseconds: 5));
+ Expect.isNotNull(wr.target);
+ c2 = null;
+ triggerGc();
+ Expect.isNull(wr.target);
+ asyncEnd();
+ });
+ Expect.isNotNull(wr.target);
+ Expect.equals(c1, wr.target);
+ await Future.delayed(Duration(milliseconds: 2));
+ c1 = null;
+ triggerGc();
+ await Future.delayed(Duration(milliseconds: 1));
+ Expect.isNotNull(wr.target);
+}
diff --git a/LanguageFeatures/FinalizationRegistry/weak_reference_target_t06.dart b/LanguageFeatures/FinalizationRegistry/weak_reference_target_t06.dart
new file mode 100644
index 0000000..9fabe93
--- /dev/null
+++ b/LanguageFeatures/FinalizationRegistry/weak_reference_target_t06.dart
@@ -0,0 +1,48 @@
+// Copyright (c) 2022, the Dart project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+/// @assertion target property
+/// T? target
+/// The current object weakly referenced by this, if any.
+///
+/// The value is either the object supplied in the constructor, or null if the
+/// weak reference has been cleared.
+///
+/// @description Check that the value of this property value is either the
+/// object supplied in the constructor, or null if the weak reference has been
+/// cleared
+/// @author sgrekhov@unipro.ru
+
+import "dart:async";
+import "gc_utils_lib.dart";
+import "../../Utils/expect.dart";
+
+class C {
+ int id;
+ C(this.id);
+}
+
+main() async {
+ C? c1 = C(42);
+ WeakReference<C> wr = WeakReference(c1);
+ asyncStart();
+ Future<C?>.delayed(Duration(milliseconds: 1), () => c1).then((C? c2) async {
+ Expect.isNotNull(wr.target);
+ Expect.equals(c1, wr.target);
+ triggerGc();
+ await Future.delayed(Duration(milliseconds: 1));
+ Expect.isNotNull(wr.target);
+ c2 = null;
+ triggerGc();
+ await Future.delayed(Duration(milliseconds: 1));
+ Expect.isNotNull(wr.target);
+ asyncEnd();
+ });
+ Expect.isNotNull(wr.target);
+ Expect.equals(c1, wr.target);
+ await Future.delayed(Duration(milliseconds: 10));
+ c1 = null;
+ triggerGc();
+ Expect.isNull(wr.target);
+}
diff --git a/LanguageFeatures/FinalizationRegistry/weak_reference_target_t07.dart b/LanguageFeatures/FinalizationRegistry/weak_reference_target_t07.dart
new file mode 100644
index 0000000..5d8eac9
--- /dev/null
+++ b/LanguageFeatures/FinalizationRegistry/weak_reference_target_t07.dart
@@ -0,0 +1,42 @@
+// Copyright (c) 2022, the Dart project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+/// @assertion target property
+/// T? target
+/// The current object weakly referenced by this, if any.
+///
+/// The value is either the object supplied in the constructor, or null if the
+/// weak reference has been cleared.
+///
+/// @description Check that the value of this property value is either the
+/// object supplied in the constructor, or null if the weak reference has been
+/// cleared
+/// @author sgrekhov@unipro.ru
+
+import "gc_utils_lib.dart";
+import "../../Utils/expect.dart";
+
+class C {
+ int id;
+ C(this.id);
+}
+
+main() async {
+ C? c1 = C(42);
+ C? c2 = c1;
+ WeakReference<C> wr = WeakReference(c1);
+ Expect.equals(c1, wr.target);
+ triggerGc();
+ await Future.delayed(Duration(milliseconds: 1));
+ Expect.equals(c1, wr.target);
+ c1 = null;
+ triggerGc();
+ await Future.delayed(Duration(milliseconds: 1));
+ Expect.isNotNull(wr.target);
+ Expect.equals(c2, wr.target);
+ c2 = null;
+ triggerGc();
+ await Future.delayed(Duration(milliseconds: 1));
+ Expect.isNull(wr.target);
+}
diff --git a/LanguageFeatures/FinalizationRegistry/weak_reference_target_t08.dart b/LanguageFeatures/FinalizationRegistry/weak_reference_target_t08.dart
new file mode 100644
index 0000000..e946b02
--- /dev/null
+++ b/LanguageFeatures/FinalizationRegistry/weak_reference_target_t08.dart
@@ -0,0 +1,40 @@
+// Copyright (c) 2022, the Dart project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+/// @assertion target property
+/// T? target
+/// The current object weakly referenced by this, if any.
+///
+/// The value is either the object supplied in the constructor, or null if the
+/// weak reference has been cleared.
+///
+/// @description Check that the value of this property value is either the
+/// object supplied in the constructor, or null if the weak reference has been
+/// cleared
+/// @author sgrekhov@unipro.ru
+
+import "gc_utils_lib.dart";
+import "../../Utils/expect.dart";
+
+class C {
+ int id;
+ C(this.id);
+}
+
+main() async {
+ C? c = C(42);
+ WeakReference<C> wr1 = WeakReference(c);
+ WeakReference<C> wr2 = WeakReference(c);
+ Expect.equals(c, wr1.target);
+ Expect.equals(c, wr2.target);
+ triggerGc();
+ await Future.delayed(Duration(milliseconds: 1));
+ Expect.equals(c, wr1.target);
+ Expect.equals(c, wr2.target);
+ c = null;
+ triggerGc();
+ await Future.delayed(Duration(milliseconds: 1));
+ Expect.isNull(wr1.target);
+ Expect.isNull(wr2.target);
+}
