Fix DPR in test view configuration (#88609)

packages/flutter_test/lib/src/binding.dart

@@ -1732,7 +1732,7 @@ class TestViewConfiguration extends ViewConfiguration {
   TestViewConfiguration._(Size size, ui.FlutterView window)
     : _paintMatrix = _getMatrix(size, window.devicePixelRatio, window),
       _hitTestMatrix = _getMatrix(size, 1.0, window),
-      super(size: size);
+      super(size: size, devicePixelRatio: window.devicePixelRatio);
 
   static Matrix4 _getMatrix(Size size, double devicePixelRatio, ui.FlutterView window) {
     final double inverseRatio = devicePixelRatio / window.devicePixelRatio;

packages/flutter_test/test/bindings_test.dart

@@ -24,6 +24,11 @@ void main() {
       // The code below will throw without the default.
       TestViewConfiguration(size: const Size(1280.0, 800.0));
     });
+
+    test('sets the DPR to match the window', () {
+      final TestViewConfiguration configuration = TestViewConfiguration(size: const Size(1280.0, 800.0));
+      expect(configuration.devicePixelRatio, binding.window.devicePixelRatio);
+    });
   });
 
   group(AutomatedTestWidgetsFlutterBinding, () {

packages/integration_test/lib/integration_test.dart

@@ -396,14 +396,6 @@ https://flutter.dev/docs/testing/integration-tests#testing-on-firebase-test-lab
   set defaultTestTimeout(Timeout timeout) => _defaultTestTimeout = timeout;
   Timeout? _defaultTestTimeout;
 
-  @override
-  void attachRootWidget(Widget rootWidget) {
-    // This is a workaround where screenshots of root widgets have incorrect
-    // bounds.
-    // TODO(jiahaog): Remove when https://github.com/flutter/flutter/issues/66006 is fixed.
-    super.attachRootWidget(RepaintBoundary(child: rootWidget));
-  }
-
   @override
   void reportExceptionNoticed(FlutterErrorDetails exception) {
     // This method is called to log errors as they happen, and they will also

packages/integration_test/test/binding_test.dart

@@ -126,11 +126,10 @@ Future<void> main() async {
       });
     });
 
-    // TODO(jiahaog): Remove when https://github.com/flutter/flutter/issues/66006 is fixed.
-    testWidgets('root widgets are wrapped with a RepaintBoundary', (WidgetTester tester) async {
+    testWidgets('root view reports correct dimensions', (WidgetTester tester) async {
       await tester.pumpWidget(const Placeholder());
 
-      expect(find.byType(RepaintBoundary), findsOneWidget);
+      expect(tester.binding.renderView.paintBounds, const Rect.fromLTWH(0, 0, 2400, 1800));
     });
   });