MaterialStatesController should dispatch creation in constructor. (#133826)

This PR also updates other tests to use matcher.

packages/flutter/test/material/material_states_controller_test.dart

@@ -4,6 +4,7 @@
 
 import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
+import 'package:leak_tracker_flutter_testing/leak_tracker_flutter_testing.dart';
 
 void main() {
   test('MaterialStatesController constructor', () {
@@ -12,6 +13,10 @@ void main() {
     expect(MaterialStatesController(<MaterialState>{MaterialState.selected}).value, <MaterialState>{MaterialState.selected});
   });
 
+  test('MaterialStatesController dispatches memory events', () {
+    expect(()=> MaterialStatesController().dispose(), dispatchesMemoryEvents(MaterialStatesController));
+  });
+
   test('MaterialStatesController update, listener', () {
     int count = 0;
     void valueChanged() {

packages/flutter/test/widgets/focus_manager_test.dart

@@ -11,6 +11,7 @@ import 'package:flutter/rendering.dart';
 import 'package:flutter/services.dart';
 import 'package:flutter/widgets.dart';
 import 'package:flutter_test/flutter_test.dart';
+import 'package:leak_tracker_flutter_testing/leak_tracker_flutter_testing.dart';
 
 void main() {
   final GlobalKey widgetKey = GlobalKey();
@@ -1610,38 +1611,11 @@ void main() {
   });
 
   test('$FocusManager dispatches object creation in constructor', () {
-    final List<ObjectEvent> events = <ObjectEvent>[];
-    void listener(ObjectEvent event) {
-      if (event.object.runtimeType == FocusManager) {
-        events.add(event);
-      }
-    }
-    MemoryAllocations.instance.addListener(listener);
-
-    final FocusManager focusManager = FocusManager();
-
-    expect(events, hasLength(1));
-
-    focusManager.dispose();
-
-    MemoryAllocations.instance.removeListener(listener);
+    expect(()=> FocusManager().dispose(), dispatchesMemoryEvents(FocusManager));
   });
 
   test('$FocusNode dispatches object creation in constructor', () {
-    final List<ObjectEvent> events = <ObjectEvent>[];
-    void listener(ObjectEvent event) {
-      if (event.object.runtimeType == FocusNode) {
-        events.add(event);
-      }
-    }
-    MemoryAllocations.instance.addListener(listener);
-
-    final FocusNode focusManager = FocusNode();
-
-    expect(events, hasLength(1));
-
-    focusManager.dispose();
-    MemoryAllocations.instance.removeListener(listener);
+    expect(()=> FocusNode().dispose(), dispatchesMemoryEvents(FocusNode));
   });
 
   testWidgets('FocusManager notifies listeners when a widget loses focus because it was removed.', (WidgetTester tester) async {

packages/flutter/test/widgets/router_test.dart

@@ -8,6 +8,7 @@ import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 import 'package:flutter_test/flutter_test.dart';
+import 'package:leak_tracker_flutter_testing/leak_tracker_flutter_testing.dart';
 
 void main() {
   testWidgets('Simple router basic functionality - synchronized', (WidgetTester tester) async {
@@ -1584,18 +1585,13 @@ testWidgets('ChildBackButtonDispatcher take priority recursively', (WidgetTester
   });
 
   test('$PlatformRouteInformationProvider dispatches object creation in constructor', () {
-    int eventCount = 0;
-    void listener(ObjectEvent event) => eventCount++;
-    MemoryAllocations.instance.addListener(listener);
-
-    final PlatformRouteInformationProvider registry = PlatformRouteInformationProvider(
-      initialRouteInformation: RouteInformation(uri: Uri.parse('http://google.com')),
-    );
-
-    expect(eventCount, 1);
+    void createAndDispose() {
+      PlatformRouteInformationProvider(
+        initialRouteInformation: RouteInformation(uri: Uri.parse('http://google.com')),
+      ).dispose();
+    }
 
-    registry.dispose();
-    MemoryAllocations.instance.removeListener(listener);
+    expect(createAndDispose, dispatchesMemoryEvents(PlatformRouteInformationProvider));
   });
 }
 

packages/flutter/test/widgets/scroll_controller_test.dart

@@ -4,9 +4,9 @@
 
 import 'dart:ui' as ui;
 
-import 'package:flutter/foundation.dart';
 import 'package:flutter/widgets.dart';
 import 'package:flutter_test/flutter_test.dart';
+import 'package:leak_tracker_flutter_testing/leak_tracker_flutter_testing.dart';
 
 import 'states.dart';
 
@@ -396,19 +396,6 @@ void main() {
   });
 
   test('$ScrollController dispatches object creation in constructor', () {
-    final List<ObjectEvent> events = <ObjectEvent>[];
-    void listener(ObjectEvent event) {
-      if (event.object.runtimeType == ScrollController) {
-        events.add(event);
-      }
-    }
-    MemoryAllocations.instance.addListener(listener);
-
-    final ScrollController controller = ScrollController();
-
-    expect(events, hasLength(1));
-
-    controller.dispose();
-    MemoryAllocations.instance.removeListener(listener);
+    expect(()=> ScrollController().dispose(), dispatchesMemoryEvents(ScrollController));
   });
 }

packages/flutter/test/widgets/shortcuts_test.dart

@@ -6,6 +6,7 @@ import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 import 'package:flutter_test/flutter_test.dart';
+import 'package:leak_tracker_flutter_testing/leak_tracker_flutter_testing.dart';
 
 void main() {
   group(LogicalKeySet, () {
@@ -667,16 +668,7 @@ void main() {
     });
 
     test('$ShortcutManager dispatches object creation in constructor', () {
-      int eventCount = 0;
-      void listener(ObjectEvent event) => eventCount++;
-      MemoryAllocations.instance.addListener(listener);
-
-      final ShortcutManager registry = ShortcutManager();
-
-      expect(eventCount, 1);
-
-      registry.dispose();
-      MemoryAllocations.instance.removeListener(listener);
+      expect(()=> ShortcutManager().dispose(), dispatchesMemoryEvents(ShortcutManager));
     });
 
     testWidgets("Shortcuts passes to the next Shortcuts widget if it doesn't map the key", (WidgetTester tester) async {
@@ -1867,16 +1859,7 @@ void main() {
     });
 
     test('dispatches object creation in constructor', () {
-      int eventCount = 0;
-      void listener(ObjectEvent event) => eventCount++;
-      MemoryAllocations.instance.addListener(listener);
-
-      final ShortcutRegistry registry = ShortcutRegistry();
-
-      expect(eventCount, 1);
-
-      registry.dispose();
-      MemoryAllocations.instance.removeListener(listener);
+      expect(()=> ShortcutRegistry().dispose(), dispatchesMemoryEvents(ShortcutRegistry));
     });
   });
 }