Dispose layers in test. (#134802)

packages/flutter/test/material/material_test.dart

@@ -1078,7 +1078,7 @@ void main() {
     });
   });
 
-  testWidgets('InkFeature skips painting if intermediate node skips', (WidgetTester tester) async {
+  testWidgetsWithLeakTracking('InkFeature skips painting if intermediate node skips', (WidgetTester tester) async {
     final GlobalKey sizedBoxKey = GlobalKey();
     final GlobalKey materialKey = GlobalKey();
     await tester.pumpWidget(Material(
@@ -1096,8 +1096,11 @@ void main() {
     controller.addInkFeature(tracker);
     expect(tracker.paintCount, 0);
 
+    final ContainerLayer layer1 = ContainerLayer();
+    addTearDown(layer1.dispose);
+
     // Force a repaint. Since it's offstage, the ink feature should not get painted.
-    materialKey.currentContext!.findRenderObject()!.paint(PaintingContext(ContainerLayer(), Rect.largest), Offset.zero);
+    materialKey.currentContext!.findRenderObject()!.paint(PaintingContext(layer1, Rect.largest), Offset.zero);
     expect(tracker.paintCount, 0);
 
     await tester.pumpWidget(Material(
@@ -1111,8 +1114,11 @@ void main() {
     // now onstage.
     expect(tracker.paintCount, 1);
 
+    final ContainerLayer layer2 = ContainerLayer();
+    addTearDown(layer2.dispose);
+
     // Force a repaint again. This time, it gets repainted because it is onstage.
-    materialKey.currentContext!.findRenderObject()!.paint(PaintingContext(ContainerLayer(), Rect.largest), Offset.zero);
+    materialKey.currentContext!.findRenderObject()!.paint(PaintingContext(layer2, Rect.largest), Offset.zero);
     expect(tracker.paintCount, 2);
   });