Define testWidgetsWithLeakTracking. (#125063)

packages/flutter/test/animation/animation_sheet_test.dart

@@ -16,6 +16,8 @@ void main() {
    * because [matchesGoldenFile] does not use Skia Gold in its native package.
    */
 
+  // TODO(polina-c): fix ValueNotifier not disposed and switch to testWidgetsWithLeakTracking.
+  // https://github.com/flutter/devtools/issues/3951
   testWidgets('correctly records frames using display', (WidgetTester tester) async {
     final AnimationSheetBuilder builder = AnimationSheetBuilder(frameSize: _DecuplePixels.size);
 
@@ -52,6 +54,8 @@ void main() {
     await expectLater(find.byWidget(display), matchesGoldenFile('test.animation_sheet_builder.records.png'));
   }, skip: isBrowser); // https://github.com/flutter/flutter/issues/56001
 
+  // TODO(polina-c): fix ValueNotifier not disposed and switch to testWidgetsWithLeakTracking.
+  // https://github.com/flutter/devtools/issues/3951
   testWidgets('correctly wraps a row', (WidgetTester tester) async {
     final AnimationSheetBuilder builder = AnimationSheetBuilder(frameSize: _DecuplePixels.size);
 
@@ -70,6 +74,8 @@ void main() {
     await expectLater(find.byWidget(display), matchesGoldenFile('test.animation_sheet_builder.wraps.png'));
   }, skip: isBrowser); // https://github.com/flutter/flutter/issues/56001
 
+  // TODO(polina-c): fix Picture and Image not disposed and and switch to testWidgetsWithLeakTracking.
+  // https://github.com/flutter/devtools/issues/3951
   testWidgets('correctly records frames using collate', (WidgetTester tester) async {
     final AnimationSheetBuilder builder = AnimationSheetBuilder(frameSize: _DecuplePixels.size);
 
@@ -104,6 +110,8 @@ void main() {
     );
   }, skip: isBrowser); // https://github.com/flutter/flutter/issues/56001
 
+  // TODO(polina-c): fix Picture and Image not disposed and switch to testWidgetsWithLeakTracking.
+  // https://github.com/flutter/devtools/issues/3951
   testWidgets('use allLayers to record out-of-subtree contents', (WidgetTester tester) async {
     final AnimationSheetBuilder builder = AnimationSheetBuilder(
       frameSize: const Size(8, 2),

packages/flutter/test/animation/futures_test.dart

@@ -6,8 +6,10 @@ import 'package:flutter/animation.dart';
 import 'package:flutter/widgets.dart';
 import 'package:flutter_test/flutter_test.dart';
 
+import '../foundation/leak_tracking.dart';
+
 void main() {
-  testWidgets('awaiting animation controllers - using direct future', (WidgetTester tester) async {
+  testWidgetsWithLeakTracking('awaiting animation controllers - using direct future', (WidgetTester tester) async {
     final AnimationController controller1 = AnimationController(
       duration: const Duration(milliseconds: 100),
       vsync: const TestVSync(),
@@ -56,7 +58,7 @@ void main() {
     expect(log, <String>['start', 'a', 'b', 'c', 'd', 'end']);
   });
 
-  testWidgets('awaiting animation controllers - using orCancel', (WidgetTester tester) async {
+  testWidgetsWithLeakTracking('awaiting animation controllers - using orCancel', (WidgetTester tester) async {
     final AnimationController controller1 = AnimationController(
       duration: const Duration(milliseconds: 100),
       vsync: const TestVSync(),
@@ -105,7 +107,7 @@ void main() {
     expect(log, <String>['start', 'a', 'b', 'c', 'd', 'end']);
   });
 
-  testWidgets('awaiting animation controllers and failing', (WidgetTester tester) async {
+  testWidgetsWithLeakTracking('awaiting animation controllers and failing', (WidgetTester tester) async {
     final AnimationController controller1 = AnimationController(
       duration: const Duration(milliseconds: 100),
       vsync: const TestVSync(),
@@ -133,7 +135,7 @@ void main() {
     expect(log, <String>['start', 'caught', 'end']);
   });
 
-  testWidgets('creating orCancel future later', (WidgetTester tester) async {
+  testWidgetsWithLeakTracking('creating orCancel future later', (WidgetTester tester) async {
     final AnimationController controller1 = AnimationController(
       duration: const Duration(milliseconds: 100),
       vsync: const TestVSync(),
@@ -146,7 +148,7 @@ void main() {
     expect(true, isTrue); // should reach here
   });
 
-  testWidgets('creating orCancel future later', (WidgetTester tester) async {
+  testWidgetsWithLeakTracking('creating orCancel future later', (WidgetTester tester) async {
     final AnimationController controller1 = AnimationController(
       duration: const Duration(milliseconds: 100),
       vsync: const TestVSync(),
@@ -163,7 +165,7 @@ void main() {
     expect(ok, isTrue); // should reach here
   });
 
-  testWidgets('TickerFuture is a Future', (WidgetTester tester) async {
+  testWidgetsWithLeakTracking('TickerFuture is a Future', (WidgetTester tester) async {
     final AnimationController controller1 = AnimationController(
       duration: const Duration(milliseconds: 100),
       vsync: const TestVSync(),

packages/flutter/test/animation/iteration_patterns_test.dart

@@ -5,6 +5,8 @@
 import 'package:flutter/widgets.dart';
 import 'package:flutter_test/flutter_test.dart';
 
+import '../foundation/leak_tracking.dart';
+
 void main() {
   setUp(() {
     WidgetsFlutterBinding.ensureInitialized();
@@ -79,7 +81,7 @@ void main() {
     controller.dispose();
   });
 
-  testWidgets('AnimationController with throwing listener', (WidgetTester tester) async {
+  testWidgetsWithLeakTracking('AnimationController with throwing listener', (WidgetTester tester) async {
     final AnimationController controller = AnimationController(
       duration: const Duration(milliseconds: 100),
       vsync: const TestVSync(),
@@ -102,7 +104,7 @@ void main() {
     log.clear();
   });
 
-  testWidgets('AnimationController with throwing status listener', (WidgetTester tester) async {
+  testWidgetsWithLeakTracking('AnimationController with throwing status listener', (WidgetTester tester) async {
     final AnimationController controller = AnimationController(
       duration: const Duration(milliseconds: 100),
       vsync: const TestVSync(),

packages/flutter/test/animation/live_binding_test.dart

@@ -10,6 +10,8 @@ library;
 import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
 
+import '../foundation/leak_tracking.dart';
+
 void main() {
   /*
    * Here lies golden tests for packages/flutter_test/lib/src/binding.dart
@@ -18,7 +20,7 @@ void main() {
 
   LiveTestWidgetsFlutterBinding().framePolicy = LiveTestWidgetsFlutterBindingFramePolicy.onlyPumps;
 
-  testWidgets('Should show event indicator for pointer events', (WidgetTester tester) async {
+  testWidgetsWithLeakTracking('Should show event indicator for pointer events', (WidgetTester tester) async {
     final AnimationSheetBuilder animationSheet = AnimationSheetBuilder(frameSize: const Size(200, 200), allLayers: true);
     final List<Offset> taps = <Offset>[];
     Widget target({bool recording = true}) => Container(
@@ -76,6 +78,8 @@ void main() {
     // Currently skipped due to daily flake: https://github.com/flutter/flutter/issues/87588
   }, skip: true); // Typically skip: isBrowser https://github.com/flutter/flutter/issues/42767
 
+  // TODO(polina-c): fix ValueNotifier not disposed and switch to testWidgetsWithLeakTracking.
+  // https://github.com/flutter/devtools/issues/3951
   testWidgets('Should show event indicator for pointer events with setSurfaceSize', (WidgetTester tester) async {
     final AnimationSheetBuilder animationSheet = AnimationSheetBuilder(frameSize: const Size(200, 200), allLayers: true);
     final List<Offset> taps = <Offset>[];

packages/flutter/test/flutter_test_config.dart

@@ -6,10 +6,14 @@ import 'dart:async';
 
 import 'package:flutter/rendering.dart';
 import 'package:flutter_test/flutter_test.dart';
+import 'package:leak_tracker/leak_tracker.dart';
 
 import '_goldens_io.dart'
   if (dart.library.html) '_goldens_web.dart' as flutter_goldens;
 
+/// Test configuration for each test library in this directory.
+///
+/// See https://api.flutter.dev/flutter/flutter_test/flutter_test-library.html.
 Future<void> testExecutable(FutureOr<void> Function() testMain) {
   // Enable checks because there are many implementations of [RenderBox] in this
   // package can benefit from the additional validations.
@@ -19,6 +23,8 @@ Future<void> testExecutable(FutureOr<void> Function() testMain) {
   // receive the event.
   WidgetController.hitTestWarningShouldBeFatal = true;
 
+  LeakTrackingTestConfig.warnForNonSupportedPlatforms = false;
+
   // Enable golden file testing using Skia Gold.
   return flutter_goldens.testExecutable(testMain);
 }

packages/flutter/test/foundation/change_notifier_test.dart

@@ -5,6 +5,8 @@
 import 'package:flutter/foundation.dart';
 import 'package:flutter_test/flutter_test.dart';
 
+import 'leak_tracking.dart';
+
 class TestNotifier extends ChangeNotifier {
   void notify() {
     notifyListeners();
@@ -49,23 +51,25 @@ class Counter with ChangeNotifier {
 }
 
 void main() {
-  testWidgets('ChangeNotifier can not dispose in callback', (WidgetTester tester) async {
+  testWidgetsWithLeakTracking('ChangeNotifier can not dispose in callback', (WidgetTester tester) async {
     final TestNotifier test = TestNotifier();
     bool callbackDidFinish = false;
     void foo() {
       test.dispose();
       callbackDidFinish = true;
     }
-
     test.addListener(foo);
+
     test.notify();
+
     final AssertionError error = tester.takeException() as AssertionError;
     expect(error.toString().contains('dispose()'), isTrue);
     // Make sure it crashes during dispose call.
     expect(callbackDidFinish, isFalse);
+    test.dispose();
   });
 
-  testWidgets('ChangeNotifier', (WidgetTester tester) async {
+  testWidgetsWithLeakTracking('ChangeNotifier', (WidgetTester tester) async {
     final List<String> log = <String>[];
     void listener() {
       log.add('listener');
@@ -147,6 +151,7 @@ void main() {
     expect(log, <String>['badListener', 'listener1', 'listener2']);
     expect(tester.takeException(), isArgumentError);
     log.clear();
+    test.dispose();
   });
 
   test('ChangeNotifier with mutating listener', () {

packages/flutter/test/foundation/leak_tracking.dart

@@ -5,9 +5,75 @@
 import 'package:flutter/foundation.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:leak_tracker/leak_tracker.dart';
+import 'package:meta/meta.dart';
 
-typedef LeaksObtainer = void Function(Leaks foundLeaks);
+/// Set of objects, that does not hold the objects from garbage collection.
+///
+/// The objects are referenced by hash codes and can duplicate with low probability.
+@visibleForTesting
+class WeakSet {
+  final Set<String> _objectCodes = <String>{};
+
+  String _toCode(int hashCode, String type) => '$type-$hashCode';
+
+  void add(Object object) {
+    _objectCodes.add(_toCode(identityHashCode(object), object.runtimeType.toString()));
+  }
+
+  void addByCode(int hashCode, String type) {
+    _objectCodes.add(_toCode(hashCode, type));
+  }
+
+  bool contains(int hashCode, String type) {
+    final bool result = _objectCodes.contains(_toCode(hashCode, type));
+    return result;
+  }
+}
+
+/// Wrapper for [testWidgets] with memory leak tracking.
+///
+/// The method will fail if instrumented objects in [callback] are
+/// garbage collected without being disposed.
+///
+/// More about leak tracking:
+/// https://github.com/dart-lang/leak_tracker.
+///
+/// See https://github.com/flutter/devtools/issues/3951 for plans
+/// on leak tracking.
+@isTest
+void testWidgetsWithLeakTracking(
+  String description,
+  WidgetTesterCallback callback, {
+  bool? skip,
+  Timeout? timeout,
+  bool semanticsEnabled = true,
+  TestVariant<Object?> variant = const DefaultTestVariant(),
+  dynamic tags,
+  LeakTrackingTestConfig leakTrackingConfig = const LeakTrackingTestConfig(),
+}) {
+  Future<void> wrappedCallback(WidgetTester tester) async {
+    await _withFlutterLeakTracking(
+      () async => callback(tester),
+      tester,
+      leakTrackingConfig,
+    );
+  }
 
+  testWidgets(
+    description,
+    wrappedCallback,
+    skip: skip,
+    timeout: timeout,
+    semanticsEnabled: semanticsEnabled,
+    variant: variant,
+    tags: tags,
+  );
+}
+
+bool _webWarningPrinted = false;
+
+/// Runs [callback] with leak tracking.
+///
 /// Wrapper for [withLeakTracking] with Flutter specific functionality.
 ///
 /// The method will fail if wrapped code contains memory leaks.
@@ -19,27 +85,20 @@ typedef LeaksObtainer = void Function(Leaks foundLeaks);
 /// 1. Listens to [MemoryAllocations] events.
 /// 2. Uses `tester.runAsync` for leak detection if [tester] is provided.
 ///
-/// If you use [testWidgets], pass [tester] to avoid async issues in leak processing.
-/// Pass null otherwise.
-///
-/// Pass [leaksObtainer] if you want to get leak information before
-/// the method failure.
-Future<void> withFlutterLeakTracking(
-  DartAsyncCallback callback, {
-  required WidgetTester? tester,
-  StackTraceCollectionConfig stackTraceCollectionConfig =
-      const StackTraceCollectionConfig(),
-  Duration? timeoutForFinalGarbageCollection,
-  LeaksObtainer? leaksObtainer,
-}) async {
-  // The method is copied (with improvements) from
-  // `package:leak_tracker/test/test_infra/flutter_helpers.dart`.
-
-  // The method is not combined with [testWidgets], because the combining will
-  // impact VSCode's ability to recognize tests.
-
+/// Pass [config] to troubleshoot or exempt leaks. See [LeakTrackingTestConfig]
+/// for details.
+Future<void> _withFlutterLeakTracking(
+  DartAsyncCallback callback,
+  WidgetTester tester,
+  LeakTrackingTestConfig config,
+) async {
   // Leak tracker does not work for web platform.
   if (kIsWeb) {
+    final bool shouldPrintWarning = !_webWarningPrinted && LeakTrackingTestConfig.warnForNonSupportedPlatforms;
+    if (shouldPrintWarning) {
+      _webWarningPrinted = true;
+      debugPrint('Leak tracking is not supported on web platform.\nTo turn off this message, set `LeakTrackingTestConfig.warnForNonSupportedPlatforms` to false.');
+    }
     await callback();
     return;
   }
@@ -50,23 +109,59 @@ Future<void> withFlutterLeakTracking(
 
   return TestAsyncUtils.guard<void>(() async {
     MemoryAllocations.instance.addListener(flutterEventToLeakTracker);
-    final AsyncCodeRunner asyncCodeRunner = tester == null
-        ? (DartAsyncCallback action) async => action()
-        : (DartAsyncCallback action) async => tester.runAsync(action);
+    Future<void> asyncCodeRunner(DartAsyncCallback action) async => tester.runAsync(action);
+
     try {
-      final Leaks leaks = await withLeakTracking(
+      Leaks leaks = await withLeakTracking(
         callback,
         asyncCodeRunner: asyncCodeRunner,
-        stackTraceCollectionConfig: stackTraceCollectionConfig,
+        stackTraceCollectionConfig: config.stackTraceCollectionConfig,
         shouldThrowOnLeaks: false,
-        timeoutForFinalGarbageCollection: timeoutForFinalGarbageCollection,
       );
-      if (leaksObtainer != null) {
-        leaksObtainer(leaks);
-      }
+
+      leaks = LeakCleaner(config).clean(leaks);
+
+      if (leaks.total > 0) {
+        config.onLeaks?.call(leaks);
+        if (config.failTestOnLeaks) {
           expect(leaks, isLeakFree);
+        }
+      }
     } finally {
       MemoryAllocations.instance.removeListener(flutterEventToLeakTracker);
     }
   });
 }
+
+/// Cleans leaks that are allowed by [config].
+@visibleForTesting
+class LeakCleaner {
+  LeakCleaner(this.config);
+
+  final LeakTrackingTestConfig config;
+
+  Leaks clean(Leaks leaks) {
+    final Leaks result =  Leaks(<LeakType, List<LeakReport>>{
+      for (LeakType leakType in leaks.byType.keys)
+        leakType: leaks.byType[leakType]!.where((LeakReport leak) => _shouldReportLeak(leakType, leak)).toList()
+    });
+    return result;
+  }
+
+  /// Returns true if [leak] should be reported as failure.
+  bool _shouldReportLeak(LeakType leakType, LeakReport leak) {
+    // Tracking for non-GCed is temporarily disabled.
+    // TODO(polina-c): turn on tracking for non-GCed after investigating existing leaks.
+    if (leakType != LeakType.notDisposed) {
+      return false;
+    }
+
+    switch (leakType) {
+      case LeakType.notDisposed:
+        return !config.notDisposedAllowList.contains(leak.type);
+      case LeakType.notGCed:
+      case LeakType.gcedLate:
+        return !config.notGCedAllowList.contains(leak.type);
+    }
+  }
+}

packages/flutter/test/foundation/leak_tracking_test.dart

+// Copyright 2014 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter/widgets.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:leak_tracker/leak_tracker.dart';
+
+import 'leak_tracking.dart';
+
+final String _leakTrackedClassName = '$_LeakTrackedClass';
+
+Leaks _leaksOfAllTypes() => Leaks(<LeakType, List<LeakReport>> {
+  LeakType.notDisposed: <LeakReport>[LeakReport(code: 1, context: <String, dynamic>{}, type:'myNotDisposedClass', trackedClass: 'myTrackedClass')],
+  LeakType.notGCed: <LeakReport>[LeakReport(code: 2, context: <String, dynamic>{}, type:'myNotGCedClass', trackedClass: 'myTrackedClass')],
+  LeakType.gcedLate: <LeakReport>[LeakReport(code: 3, context: <String, dynamic>{}, type:'myGCedLateClass', trackedClass: 'myTrackedClass')],
+});
+
+Future<void> main() async {
+  test('Trivial $LeakCleaner returns only non-disposed leaks.', () {
+    final LeakCleaner leakCleaner = LeakCleaner(const LeakTrackingTestConfig());
+    final Leaks leaks = _leaksOfAllTypes();
+    final int leakTotal = leaks.total;
+
+    final Leaks cleanedLeaks = leakCleaner.clean(leaks);
+
+    expect(leaks.total, leakTotal);
+    expect(cleanedLeaks.total, 1);
+  });
+
+  group('Leak tracking works for non-web', () {
+    testWidgetsWithLeakTracking(
+      'Leak tracker respects all allow lists',
+      (WidgetTester tester) async {
+        await tester.pumpWidget(_StatelessLeakingWidget());
+      },
+      leakTrackingConfig: LeakTrackingTestConfig(
+        notDisposedAllowList: <String>{_leakTrackedClassName},
+        notGCedAllowList: <String>{_leakTrackedClassName},
+      ),
+    );
+
+    group('Leak tracker respects notGCed allow lists', () {
+      // These tests cannot run inside other tests because test nesting is forbidden.
+      // So, `expect` happens outside the tests, in `tearDown`.
+      late Leaks leaks;
+
+      testWidgetsWithLeakTracking(
+        'when $_StatelessLeakingWidget leaks',
+        (WidgetTester tester) async {
+          await tester.pumpWidget(_StatelessLeakingWidget());
+        },
+        leakTrackingConfig: LeakTrackingTestConfig(
+          onLeaks: (Leaks theLeaks) {
+            leaks = theLeaks;
+          },
+          failTestOnLeaks: false,
+          notGCedAllowList: <String>{_leakTrackedClassName},
+        ),
+      );
+
+      tearDown(() => _verifyLeaks(leaks, expectedNotDisposed: 1));
+    });
+
+    group('Leak tracker catches that', () {
+      // These tests cannot run inside other tests because test nesting is forbidden.
+      // So, `expect` happens outside the tests, in `tearDown`.
+      late Leaks leaks;
+
+      testWidgetsWithLeakTracking(
+        '$_StatelessLeakingWidget leaks',
+        (WidgetTester tester) async {
+          await tester.pumpWidget(_StatelessLeakingWidget());
+        },
+        leakTrackingConfig: LeakTrackingTestConfig(
+          onLeaks: (Leaks theLeaks) {
+            leaks = theLeaks;
+          },
+          failTestOnLeaks: false,
+        ),
+      );
+
+      tearDown(() => _verifyLeaks(leaks, expectedNotDisposed: 1));
+    });
+  },
+  skip: isBrowser); // [intended] Leak detection is off for web.
+
+  testWidgetsWithLeakTracking('Leak tracking is no-op for web', (WidgetTester tester) async {
+    await tester.pumpWidget(_StatelessLeakingWidget());
+  },
+  skip: !isBrowser); // [intended] Leaks detection is off for web.
+}
+
+/// Verifies [leaks] contains expected number of leaks for [_LeakTrackedClass].
+void _verifyLeaks(Leaks leaks, { int expectedNotDisposed = 0,  int expectedNotGCed = 0 }) {
+  const String linkToLeakTracker = 'https://github.com/dart-lang/leak_tracker';
+
+  expect(
+    () => expect(leaks, isLeakFree),
+    throwsA(
+      predicate((Object? e) {
+        return e is TestFailure && e.toString().contains(linkToLeakTracker);
+      }),
+    ),
+  );
+
+  _verifyLeakList(leaks.notDisposed, expectedNotDisposed);
+  _verifyLeakList(leaks.notGCed, expectedNotGCed);
+}
+
+void _verifyLeakList(List<LeakReport> list, int expectedCount){
+  expect(list.length, expectedCount);
+
+  for (final LeakReport leak in list) {
+    expect(leak.trackedClass, contains(_LeakTrackedClass.library));
+    expect(leak.trackedClass, contains(_leakTrackedClassName));
+  }
+}
+
+/// Storage to keep disposed objects, to generate not-gced leaks.
+final List<_LeakTrackedClass> _notGcedStorage = <_LeakTrackedClass>[];
+
+class _StatelessLeakingWidget extends StatelessWidget {
+  _StatelessLeakingWidget() {
+    // ignore: unused_local_variable, the variable is used to create non disposed leak
+    final _LeakTrackedClass notDisposed = _LeakTrackedClass();
+    _notGcedStorage.add(_LeakTrackedClass()..dispose());
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return const Placeholder();
+  }
+}
+
+class _LeakTrackedClass {
+  _LeakTrackedClass() {
+    dispatchObjectCreated(
+      library: library,
+      className: '$_LeakTrackedClass',
+      object: this,
+    );
+  }
+
+  static const String library = 'package:my_package/lib/src/my_lib.dart';
+
+  void dispose() {
+    dispatchObjectDisposed(object: this);
+  }
+}

packages/flutter/test/gestures/debug_test.dart

@@ -6,8 +6,10 @@ import 'package:flutter/foundation.dart';
 import 'package:flutter/gestures.dart';
 import 'package:flutter_test/flutter_test.dart';
 
+import '../foundation/leak_tracking.dart';
+
 void main() {
-  testWidgets('debugPrintGestureArenaDiagnostics', (WidgetTester tester) async {
+  testWidgetsWithLeakTracking('debugPrintGestureArenaDiagnostics', (WidgetTester tester) async {
     PointerEvent event;
     debugPrintGestureArenaDiagnostics = true;
     final DebugPrintCallback oldCallback = debugPrint;
@@ -53,7 +55,7 @@ void main() {
     debugPrint = oldCallback;
   });
 
-  testWidgets('debugPrintRecognizerCallbacksTrace', (WidgetTester tester) async {
+  testWidgetsWithLeakTracking('debugPrintRecognizerCallbacksTrace', (WidgetTester tester) async {
     PointerEvent event;
     debugPrintRecognizerCallbacksTrace = true;
     final DebugPrintCallback oldCallback = debugPrint;
@@ -95,7 +97,7 @@ void main() {
     debugPrint = oldCallback;
   });
 
-  testWidgets('debugPrintGestureArenaDiagnostics and debugPrintRecognizerCallbacksTrace', (WidgetTester tester) async {
+  testWidgetsWithLeakTracking('debugPrintGestureArenaDiagnostics and debugPrintRecognizerCallbacksTrace', (WidgetTester tester) async {
     PointerEvent event;
     debugPrintGestureArenaDiagnostics = true;
     debugPrintRecognizerCallbacksTrace = true;

packages/flutter/test/gestures/gesture_binding_resample_event_on_widget_test.dart

@@ -10,6 +10,8 @@ import 'package:flutter/scheduler.dart';
 import 'package:flutter/widgets.dart';
 import 'package:flutter_test/flutter_test.dart';
 
+import '../foundation/leak_tracking.dart';
+
 class TestResampleEventFlutterBinding extends AutomatedTestWidgetsFlutterBinding {
   @override
   SamplingClock? get debugSamplingClock => TestSamplingClock(this.clock);
@@ -29,7 +31,7 @@ class TestSamplingClock implements SamplingClock {
 
 void main() {
   final TestWidgetsFlutterBinding binding = TestResampleEventFlutterBinding();
-  testWidgets('PointerEvent resampling on a widget', (WidgetTester tester) async {
+  testWidgetsWithLeakTracking('PointerEvent resampling on a widget', (WidgetTester tester) async {
     assert(WidgetsBinding.instance == binding);
     Duration currentTestFrameTime() => Duration(milliseconds: binding.clock.now().millisecondsSinceEpoch);
     void requestFrame() => SchedulerBinding.instance.scheduleFrameCallback((_) {});
@@ -124,7 +126,7 @@ void main() {
     expect(events[3], isA<PointerUpEvent>());
   });
 
-  testWidgets('Timer should be canceled when resampling stopped', (WidgetTester tester) async {
+  testWidgetsWithLeakTracking('Timer should be canceled when resampling stopped', (WidgetTester tester) async {
     // A timer will be started when event's timeStamp is larger than sampleTime.
     final ui.PointerDataPacket packet = ui.PointerDataPacket(
       data: <ui.PointerData>[

packages/flutter/test/gestures/gesture_config_regression_test.dart

@@ -7,6 +7,8 @@ import 'dart:ui' as ui;
 import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
 
+import '../foundation/leak_tracking.dart';
+
 class TestResult {
   bool dragStarted = false;
   bool dragUpdate = false;
@@ -89,7 +91,7 @@ class NestedDraggableCase extends StatelessWidget {
 }
 
 void main() {
-  testWidgets('Scroll Views get the same ScrollConfiguration as GestureDetectors', (WidgetTester tester) async {
+  testWidgetsWithLeakTracking('Scroll Views get the same ScrollConfiguration as GestureDetectors', (WidgetTester tester) async {
     tester.view.gestureSettings = const ui.GestureSettings(physicalTouchSlop: 4);
     addTearDown(tester.view.reset);
 
@@ -112,6 +114,8 @@ void main() {
    expect(result.dragUpdate, true);
   });
 
+  // TODO(polina-c): fix ValueNotifier not disposed and switch to testWidgetsWithLeakTracking.
+  // https://github.com/flutter/devtools/issues/3951
   testWidgets('Scroll Views get the same ScrollConfiguration as Draggables', (WidgetTester tester) async {
     tester.view.gestureSettings = const ui.GestureSettings(physicalTouchSlop: 4);
     addTearDown(tester.view.reset);

packages/flutter/test/gestures/transformed_double_tap_test.dart

@@ -6,8 +6,10 @@ import 'package:flutter/gestures.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
 
+import '../foundation/leak_tracking.dart';
+
 void main() {
-  testWidgets('kTouchSlop is evaluated in the global coordinate space when scaled up', (WidgetTester tester) async {
+  testWidgetsWithLeakTracking('kTouchSlop is evaluated in the global coordinate space when scaled up', (WidgetTester tester) async {
     int doubleTapCount = 0;
 
     final Key redContainer = UniqueKey();
@@ -51,7 +53,7 @@ void main() {
     expect(doubleTapCount, 0);
   });
 
-  testWidgets('kTouchSlop is evaluated in the global coordinate space when scaled down', (WidgetTester tester) async {
+  testWidgetsWithLeakTracking('kTouchSlop is evaluated in the global coordinate space when scaled down', (WidgetTester tester) async {
     int doubleTapCount = 0;
 
     final Key redContainer = UniqueKey();

packages/flutter/test/gestures/transformed_long_press_test.dart

@@ -6,8 +6,10 @@ import 'package:flutter/gestures.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
 
+import '../foundation/leak_tracking.dart';
+
 void main() {
-  testWidgets('gets local coordinates', (WidgetTester tester) async {
+  testWidgetsWithLeakTracking('gets local coordinates', (WidgetTester tester) async {
     int longPressCount = 0;
     int longPressUpCount = 0;
     final List<LongPressEndDetails> endDetails = <LongPressEndDetails>[];
@@ -53,7 +55,7 @@ void main() {
     expect(endDetails.single.globalPosition, const Offset(400, 300));
   });
 
-  testWidgets('scaled up', (WidgetTester tester) async {
+  testWidgetsWithLeakTracking('scaled up', (WidgetTester tester) async {
     int longPressCount = 0;
     int longPressUpCount = 0;
     final List<LongPressEndDetails> endDetails = <LongPressEndDetails>[];
@@ -128,7 +130,7 @@ void main() {
     expect(moveDetails.single.localOffsetFromOrigin, const Offset(0, 100.0 / 2.0));
   });
 
-  testWidgets('scaled down', (WidgetTester tester) async {
+  testWidgetsWithLeakTracking('scaled down', (WidgetTester tester) async {
     int longPressCount = 0;
     int longPressUpCount = 0;
     final List<LongPressEndDetails> endDetails = <LongPressEndDetails>[];

packages/flutter/test/gestures/transformed_monodrag_test.dart

@@ -8,9 +8,11 @@ import 'package:flutter/gestures.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
 
+import '../foundation/leak_tracking.dart';
+
 void main() {
   group('Horizontal', () {
-    testWidgets('gets local coordinates', (WidgetTester tester) async {
+    testWidgetsWithLeakTracking('gets local coordinates', (WidgetTester tester) async {
       int dragCancelCount = 0;
       final List<DragDownDetails> downDetails = <DragDownDetails>[];
       final List<DragEndDetails> endDetails = <DragEndDetails>[];
@@ -65,7 +67,7 @@ void main() {
       );
     });
 
-    testWidgets('kTouchSlop is evaluated in the global coordinate space when scaled up', (WidgetTester tester) async {
+    testWidgetsWithLeakTracking('kTouchSlop is evaluated in the global coordinate space when scaled up', (WidgetTester tester) async {
       int dragCancelCount = 0;
       final List<DragDownDetails> downDetails = <DragDownDetails>[];
       final List<DragEndDetails> endDetails = <DragEndDetails>[];
@@ -163,7 +165,7 @@ void main() {
       updateDetails.clear();
     });
 
-    testWidgets('kTouchSlop is evaluated in the global coordinate space when scaled down', (WidgetTester tester) async {
+    testWidgetsWithLeakTracking('kTouchSlop is evaluated in the global coordinate space when scaled down', (WidgetTester tester) async {
       int dragCancelCount = 0;
       final List<DragDownDetails> downDetails = <DragDownDetails>[];
       final List<DragEndDetails> endDetails = <DragEndDetails>[];
@@ -261,7 +263,7 @@ void main() {
       updateDetails.clear();
     });
 
-    testWidgets('kTouchSlop is evaluated in the global coordinate space when rotated 45 degrees', (WidgetTester tester) async {
+    testWidgetsWithLeakTracking('kTouchSlop is evaluated in the global coordinate space when rotated 45 degrees', (WidgetTester tester) async {
       int dragCancelCount = 0;
       final List<DragDownDetails> downDetails = <DragDownDetails>[];
       final List<DragEndDetails> endDetails = <DragEndDetails>[];
@@ -338,7 +340,7 @@ void main() {
   });
 
   group('Vertical', () {
-    testWidgets('gets local coordinates', (WidgetTester tester) async {
+    testWidgetsWithLeakTracking('gets local coordinates', (WidgetTester tester) async {
       int dragCancelCount = 0;
       final List<DragDownDetails> downDetails = <DragDownDetails>[];
       final List<DragEndDetails> endDetails = <DragEndDetails>[];
@@ -393,7 +395,7 @@ void main() {
       );
     });
 
-    testWidgets('kTouchSlop is evaluated in the global coordinate space when scaled up', (WidgetTester tester) async {
+    testWidgetsWithLeakTracking('kTouchSlop is evaluated in the global coordinate space when scaled up', (WidgetTester tester) async {
       int dragCancelCount = 0;
       final List<DragDownDetails> downDetails = <DragDownDetails>[];
       final List<DragEndDetails> endDetails = <DragEndDetails>[];
@@ -491,7 +493,7 @@ void main() {
       updateDetails.clear();
     });
 
-    testWidgets('kTouchSlop is evaluated in the global coordinate space when scaled down', (WidgetTester tester) async {
+    testWidgetsWithLeakTracking('kTouchSlop is evaluated in the global coordinate space when scaled down', (WidgetTester tester) async {
       int dragCancelCount = 0;
       final List<DragDownDetails> downDetails = <DragDownDetails>[];
       final List<DragEndDetails> endDetails = <DragEndDetails>[];
@@ -589,7 +591,7 @@ void main() {
       updateDetails.clear();
     });
 
-    testWidgets('kTouchSlop is evaluated in the global coordinate space when rotated 45 degrees', (WidgetTester tester) async {
+    testWidgetsWithLeakTracking('kTouchSlop is evaluated in the global coordinate space when rotated 45 degrees', (WidgetTester tester) async {
       int dragCancelCount = 0;
       final List<DragDownDetails> downDetails = <DragDownDetails>[];
       final List<DragEndDetails> endDetails = <DragEndDetails>[];

packages/flutter/test/gestures/transformed_scale_test.dart

@@ -5,8 +5,10 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
 
+import '../foundation/leak_tracking.dart';
+
 void main() {
-  testWidgets('gets local coordinates', (WidgetTester tester) async {
+  testWidgetsWithLeakTracking('gets local coordinates', (WidgetTester tester) async {
     final List<ScaleStartDetails> startDetails = <ScaleStartDetails>[];
     final List<ScaleUpdateDetails> updateDetails = <ScaleUpdateDetails>[];
 

packages/flutter/test/gestures/transformed_tap_test.dart

@@ -6,8 +6,10 @@ import 'package:flutter/gestures.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
 
+import '../foundation/leak_tracking.dart';
+
 void main() {
-  testWidgets('gets local coordinates', (WidgetTester tester) async {
+  testWidgetsWithLeakTracking('gets local coordinates', (WidgetTester tester) async {
     int tapCount = 0;
     int tapCancelCount = 0;
     final List<TapDownDetails> downDetails = <TapDownDetails>[];
@@ -48,7 +50,7 @@ void main() {
     expect(upDetails.single.globalPosition, const Offset(400, 300));
   });
 
-  testWidgets('kTouchSlop is evaluated in the global coordinate space when scaled up', (WidgetTester tester) async {
+  testWidgetsWithLeakTracking('kTouchSlop is evaluated in the global coordinate space when scaled up', (WidgetTester tester) async {
     int tapCount = 0;
     int tapCancelCount = 0;
     final List<TapDownDetails> downDetails = <TapDownDetails>[];
@@ -111,7 +113,7 @@ void main() {
     expect(upDetails, isEmpty);
   });
 
-  testWidgets('kTouchSlop is evaluated in the global coordinate space when scaled down', (WidgetTester tester) async {
+  testWidgetsWithLeakTracking('kTouchSlop is evaluated in the global coordinate space when scaled down', (WidgetTester tester) async {
     int tapCount = 0;
     int tapCancelCount = 0;
     final List<TapDownDetails> downDetails = <TapDownDetails>[];

packages/flutter/test/material/action_chip_test.dart

@@ -5,6 +5,8 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
 
+import '../foundation/leak_tracking.dart';
+
 /// Adds the basic requirements for a Chip.
 Widget wrapForChip({
   required Widget child,
@@ -34,7 +36,7 @@ void checkChipMaterialClipBehavior(WidgetTester tester, Clip clipBehavior) {
 }
 
 void main() {
-  testWidgets('ActionChip can be tapped', (WidgetTester tester) async {
+  testWidgetsWithLeakTracking('ActionChip can be tapped', (WidgetTester tester) async {
     await tester.pumpWidget(
       MaterialApp(
         home: Material(
@@ -50,7 +52,7 @@ void main() {
     expect(tester.takeException(), null);
   });
 
-  testWidgets('ActionChip clipBehavior properly passes through to the Material', (WidgetTester tester) async {
+  testWidgetsWithLeakTracking('ActionChip clipBehavior properly passes through to the Material', (WidgetTester tester) async {
     const Text label = Text('label');
     await tester.pumpWidget(wrapForChip(child: ActionChip(label: label, onPressed: () { })));
     checkChipMaterialClipBehavior(tester, Clip.none);

packages/flutter/test/material/action_icons_theme_test.dart

@@ -6,6 +6,8 @@ import 'package:flutter/material.dart';
 import 'package:flutter/rendering.dart';
 import 'package:flutter_test/flutter_test.dart';
 
+import '../foundation/leak_tracking.dart';
+
 void main() {
   test('ActionIconThemeData copyWith, ==, hashCode basics', () {
     expect(const ActionIconThemeData(), const ActionIconThemeData().copyWith());
@@ -21,7 +23,7 @@ void main() {
     expect(themeData.endDrawerButtonIconBuilder, null);
   });
 
-  testWidgets('Default ActionIconThemeData debugFillProperties',
+  testWidgetsWithLeakTracking('Default ActionIconThemeData debugFillProperties',
       (WidgetTester tester) async {
     final DiagnosticPropertiesBuilder builder = DiagnosticPropertiesBuilder();
     const ActionIconThemeData().debugFillProperties(builder);
@@ -34,7 +36,7 @@ void main() {
     expect(description, <String>[]);
   });
 
-  testWidgets('ActionIconThemeData implements debugFillProperties',
+  testWidgetsWithLeakTracking('ActionIconThemeData implements debugFillProperties',
       (WidgetTester tester) async {
     Widget actionButtonIconBuilder(BuildContext context) {
       return const Icon(IconData(0));
@@ -62,7 +64,7 @@ void main() {
     ]);
   });
 
-  testWidgets('Action buttons use ThemeData action icon theme', (WidgetTester tester) async {
+  testWidgetsWithLeakTracking('Action buttons use ThemeData action icon theme', (WidgetTester tester) async {
     const Color green = Color(0xff00ff00);
     const IconData icon = IconData(0);
 
@@ -123,7 +125,7 @@ void main() {
   // This test is essentially the same as 'Action buttons use ThemeData action icon theme'. In
   // this case the theme is introduced with the ActionIconTheme widget instead of
   // ThemeData.actionIconTheme.
-  testWidgets('Action buttons use ActionIconTheme', (WidgetTester tester) async {
+  testWidgetsWithLeakTracking('Action buttons use ActionIconTheme', (WidgetTester tester) async {
     const Color green = Color(0xff00ff00);
     const IconData icon = IconData(0);
 

packages/flutter/test/material/adaptive_text_selection_toolbar_test.dart

@@ -8,6 +8,7 @@ import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 import 'package:flutter_test/flutter_test.dart';
 
+import '../foundation/leak_tracking.dart';
 import '../widgets/clipboard_utils.dart';
 import '../widgets/editable_text_utils.dart';
 
@@ -25,7 +26,7 @@ void main() {
     await Clipboard.setData(const ClipboardData(text: 'Clipboard data'));
   });
 
-  testWidgets('Builds the right toolbar on each platform, including web, and shows buttonItems', (WidgetTester tester) async {
+  testWidgetsWithLeakTracking('Builds the right toolbar on each platform, including web, and shows buttonItems', (WidgetTester tester) async {
     const String buttonText = 'Click me';
 
     await tester.pumpWidget(
@@ -80,7 +81,7 @@ void main() {
     skip: isBrowser, // [intended] see https://github.com/flutter/flutter/issues/108382
   );
 
-  testWidgets('Can build children directly as well', (WidgetTester tester) async {
+  testWidgetsWithLeakTracking('Can build children directly as well', (WidgetTester tester) async {
     final GlobalKey key = GlobalKey();
 
     await tester.pumpWidget(
@@ -103,7 +104,7 @@ void main() {
     expect(find.byKey(key), findsOneWidget);
   });
 
-  testWidgets('Can build from EditableTextState', (WidgetTester tester) async {
+  testWidgetsWithLeakTracking('Can build from EditableTextState', (WidgetTester tester) async {
     final GlobalKey key = GlobalKey();
     await tester.pumpWidget(
       MaterialApp(
@@ -167,7 +168,7 @@ void main() {
     variant: TargetPlatformVariant.all(),
   );
 
-  testWidgets('Can build for editable text from raw parameters', (WidgetTester tester) async {
+  testWidgetsWithLeakTracking('Can build for editable text from raw parameters', (WidgetTester tester) async {
     final GlobalKey key = GlobalKey();
     await tester.pumpWidget(
       MaterialApp(
@@ -216,7 +217,7 @@ void main() {
   );
 
   group('buttonItems', () {
-    testWidgets('getEditableTextButtonItems builds the correct button items per-platform', (WidgetTester tester) async {
+    testWidgetsWithLeakTracking('getEditableTextButtonItems builds the correct button items per-platform', (WidgetTester tester) async {
       // Fill the clipboard so that the Paste option is available in the text
       // selection menu.
       await Clipboard.setData(const ClipboardData(text: 'Clipboard data'));
@@ -311,7 +312,7 @@ void main() {
       skip: kIsWeb, // [intended]
     );
 
-    testWidgets('getAdaptiveButtons builds the correct button widgets per-platform', (WidgetTester tester) async {
+    testWidgetsWithLeakTracking('getAdaptiveButtons builds the correct button widgets per-platform', (WidgetTester tester) async {
       const String buttonText = 'Click me';
 
       await tester.pumpWidget(

packages/flutter/test/material/flutter_logo_test.dart

@@ -11,6 +11,8 @@ import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
 
 void main() {
+  // TODO(polina-c): fix Image not disposed and switch to testWidgetsWithLeakTracking.
+  // https://github.com/flutter/devtools/issues/3951
   testWidgets('Flutter Logo golden test', (WidgetTester tester) async {
     final Key logo = UniqueKey();
     await tester.pumpWidget(FlutterLogo(key: logo));