Clean leaky tests. (#150335)

Author: polina-c

packages/flutter/test/cupertino/material/tab_scaffold_test.dart

@@ -7,16 +7,12 @@ import 'dart:typed_data';
 import 'package:flutter/cupertino.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
-import 'package:leak_tracker_flutter_testing/leak_tracker_flutter_testing.dart';
 
 import '../../image_data.dart';
 
 late List<int> selectedTabs;
 
 void main() {
-  // TODO(polina-c): dispose ImageStreamCompleterHandle, https://github.com/flutter/flutter/issues/145599 [leaks-to-clean]
-  LeakTesting.settings = LeakTesting.settings.withIgnoredAll();
-
   setUp(() {
     selectedTabs = <int>[];
   });
@@ -328,6 +324,7 @@ void main() {
 
     expect(contents.length, greaterThan(0));
     expect(contents, isNot(contains(predicate((RichText t) => t.textScaler != const TextScaler.linear(99.0)))));
+    imageCache.clear();
   });
 }
 

packages/flutter/test/material/circle_avatar_test.dart

@@ -12,7 +12,6 @@ import 'dart:typed_data';
 import 'package:flutter/material.dart';
 import 'package:flutter/rendering.dart';
 import 'package:flutter_test/flutter_test.dart';
-import 'package:leak_tracker_flutter_testing/leak_tracker_flutter_testing.dart';
 import '../image_data.dart';
 import '../painting/mocks_for_image_cache.dart';
 
@@ -95,10 +94,8 @@ void main() {
     expect(decoration.image!.fit, equals(BoxFit.cover));
   });
 
-  testWidgets('CircleAvatar backgroundImage is used as a fallback for foregroundImage',
-  // TODO(polina-c): make sure images are disposed, https://github.com/flutter/flutter/issues/141388 [leaks-to-clean]
-  experimentalLeakTesting: LeakTesting.settings.withIgnoredAll(),
-  (WidgetTester tester) async {
+  testWidgets('CircleAvatar backgroundImage is used as a fallback for foregroundImage', (WidgetTester tester) async {
+    addTearDown(imageCache.clear);
     final ErrorImageProvider errorImage = ErrorImageProvider();
     bool caughtForegroundImageError = false;
     await tester.pumpWidget(

packages/flutter/test/widgets/obscured_animated_image_test.dart

@@ -8,7 +8,6 @@ import 'dart:ui' as ui show Image;
 import 'package:flutter/material.dart';
 import 'package:flutter/rendering.dart';
 import 'package:flutter_test/flutter_test.dart';
-import 'package:leak_tracker_flutter_testing/leak_tracker_flutter_testing.dart';
 
 import '../image_data.dart';
 import '../painting/fake_codec.dart';
@@ -18,10 +17,7 @@ Future<void> main() async {
   final FakeCodec fakeCodec = await FakeCodec.fromData(Uint8List.fromList(kAnimatedGif));
   final FakeImageProvider fakeImageProvider = FakeImageProvider(fakeCodec);
 
-  testWidgets('Obscured image does not animate',
-  // TODO(polina-c): dispose ImageStreamCompleterHandle, https://github.com/flutter/flutter/issues/145599 [leaks-to-clean]
-  experimentalLeakTesting: LeakTesting.settings.withIgnoredAll(),
-  (WidgetTester tester) async {
+  testWidgets('Obscured image does not animate', (WidgetTester tester) async {
     final GlobalKey imageKey = GlobalKey();
     await tester.pumpWidget(
       MaterialApp(
@@ -47,5 +43,6 @@ Future<void> main() async {
     await tester.pump(const Duration(milliseconds: 100));
     final ui.Image? image4 = renderImage.image;
     expect(image3, same(image4));
+    imageCache.clear();
   });
 }

packages/flutter/test/widgets/shape_decoration_test.dart

@@ -7,7 +7,6 @@ import 'dart:ui' as ui show Image;
 
 import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
-import 'package:leak_tracker_flutter_testing/leak_tracker_flutter_testing.dart';
 
 import '../image_data.dart';
 import '../painting/mocks_for_image_cache.dart';
@@ -18,10 +17,8 @@ Future<void> main() async {
   final ui.Image rawImage = await decodeImageFromList(Uint8List.fromList(kTransparentImage));
   final ImageProvider image = TestImageProvider(0, 0, image: rawImage);
 
-  testWidgets('ShapeDecoration.image',
-  // TODO(polina-c): dispose ImageStreamCompleterHandle, https://github.com/flutter/flutter/issues/145599 [leaks-to-clean]
-  experimentalLeakTesting: LeakTesting.settings.withIgnoredAll(),
-  (WidgetTester tester) async {
+  testWidgets('ShapeDecoration.image', (WidgetTester tester) async {
+    addTearDown(imageCache.clear);
     await tester.pumpWidget(
       MaterialApp(
         home: DecoratedBox(
@@ -94,10 +91,8 @@ Future<void> main() async {
     );
   });
 
-  testWidgets('TestBorder and Directionality - 2',
-  // TODO(polina-c): dispose ImageStreamCompleterHandle, https://github.com/flutter/flutter/issues/145599 [leaks-to-clean]
-  experimentalLeakTesting: LeakTesting.settings.withIgnoredAll(),
-  (WidgetTester tester) async {
+  testWidgets('TestBorder and Directionality - 2', (WidgetTester tester) async {
+    addTearDown(imageCache.clear);
     final List<String> log = <String>[];
     await tester.pumpWidget(
       Directionality(