diff --git a/examples/api/lib/material/app/app.0.dart b/examples/api/lib/material/app/app.0.dart
index 2ebe7d1b24..39d16aa494 100644
--- a/examples/api/lib/material/app/app.0.dart
+++ b/examples/api/lib/material/app/app.0.dart
@@ -51,9 +51,9 @@ class _MaterialAppExampleState extends State<MaterialAppExample> {
                       case AnimationStyles.defaultStyle:
                         _animationStyle = null;
                       case AnimationStyles.custom:
-                        _animationStyle = AnimationStyle(
+                        _animationStyle = const AnimationStyle(
                           curve: Easing.emphasizedAccelerate,
-                          duration: const Duration(seconds: 1),
+                          duration: Duration(seconds: 1),
                         );
                       case AnimationStyles.none:
                         _animationStyle = AnimationStyle.noAnimation;
diff --git a/examples/api/lib/material/bottom_sheet/show_bottom_sheet.0.dart b/examples/api/lib/material/bottom_sheet/show_bottom_sheet.0.dart
index 401b1f2f5a..8160d010a6 100644
--- a/examples/api/lib/material/bottom_sheet/show_bottom_sheet.0.dart
+++ b/examples/api/lib/material/bottom_sheet/show_bottom_sheet.0.dart
@@ -53,9 +53,9 @@ class _BottomSheetExampleState extends State<BottomSheetExample> {
               setState(() {
                 _animationStyle = switch (styles.first) {
                   AnimationStyles.defaultStyle => null,
-                  AnimationStyles.custom => AnimationStyle(
-                    duration: const Duration(seconds: 3),
-                    reverseDuration: const Duration(seconds: 1),
+                  AnimationStyles.custom => const AnimationStyle(
+                    duration: Duration(seconds: 3),
+                    reverseDuration: Duration(seconds: 1),
                   ),
                   AnimationStyles.none => AnimationStyle.noAnimation,
                 };
diff --git a/examples/api/lib/material/bottom_sheet/show_modal_bottom_sheet.2.dart b/examples/api/lib/material/bottom_sheet/show_modal_bottom_sheet.2.dart
index 6dfed5b9d4..9466ad4d66 100644
--- a/examples/api/lib/material/bottom_sheet/show_modal_bottom_sheet.2.dart
+++ b/examples/api/lib/material/bottom_sheet/show_modal_bottom_sheet.2.dart
@@ -53,9 +53,9 @@ class _ModalBottomSheetExampleState extends State<ModalBottomSheetExample> {
               setState(() {
                 _animationStyle = switch (styles.first) {
                   AnimationStyles.defaultStyle => null,
-                  AnimationStyles.custom => AnimationStyle(
-                    duration: const Duration(seconds: 3),
-                    reverseDuration: const Duration(seconds: 1),
+                  AnimationStyles.custom => const AnimationStyle(
+                    duration: Duration(seconds: 3),
+                    reverseDuration: Duration(seconds: 1),
                   ),
                   AnimationStyles.none => AnimationStyle.noAnimation,
                 };
diff --git a/examples/api/lib/material/chip/chip_attributes.chip_animation_style.0.dart b/examples/api/lib/material/chip/chip_attributes.chip_animation_style.0.dart
index dc99ad9428..1cffbcfbed 100644
--- a/examples/api/lib/material/chip/chip_attributes.chip_animation_style.0.dart
+++ b/examples/api/lib/material/chip/chip_attributes.chip_animation_style.0.dart
@@ -43,9 +43,9 @@ class _ChipAnimationStyleExampleState extends State<ChipAnimationStyleExample> {
               children: <Widget>[
                 FilterChip.elevated(
                   chipAnimationStyle: ChipAnimationStyle(
-                    enableAnimation: AnimationStyle(
-                      duration: const Duration(seconds: 3),
-                      reverseDuration: const Duration(seconds: 1),
+                    enableAnimation: const AnimationStyle(
+                      duration: Duration(seconds: 3),
+                      reverseDuration: Duration(seconds: 1),
                     ),
                   ),
                   onSelected: !enabled ? null : (bool value) {},
@@ -69,9 +69,9 @@ class _ChipAnimationStyleExampleState extends State<ChipAnimationStyleExample> {
               children: <Widget>[
                 FilterChip.elevated(
                   chipAnimationStyle: ChipAnimationStyle(
-                    selectAnimation: AnimationStyle(
-                      duration: const Duration(seconds: 3),
-                      reverseDuration: const Duration(seconds: 1),
+                    selectAnimation: const AnimationStyle(
+                      duration: Duration(seconds: 3),
+                      reverseDuration: Duration(seconds: 1),
                     ),
                   ),
                   backgroundColor: Colors.amber,
@@ -102,9 +102,9 @@ class _ChipAnimationStyleExampleState extends State<ChipAnimationStyleExample> {
               children: <Widget>[
                 FilterChip.elevated(
                   chipAnimationStyle: ChipAnimationStyle(
-                    avatarDrawerAnimation: AnimationStyle(
-                      duration: const Duration(seconds: 2),
-                      reverseDuration: const Duration(seconds: 1),
+                    avatarDrawerAnimation: const AnimationStyle(
+                      duration: Duration(seconds: 2),
+                      reverseDuration: Duration(seconds: 1),
                     ),
                   ),
                   selected: showCheckmark,
@@ -127,9 +127,9 @@ class _ChipAnimationStyleExampleState extends State<ChipAnimationStyleExample> {
               children: <Widget>[
                 FilterChip.elevated(
                   chipAnimationStyle: ChipAnimationStyle(
-                    deleteDrawerAnimation: AnimationStyle(
-                      duration: const Duration(seconds: 2),
-                      reverseDuration: const Duration(seconds: 1),
+                    deleteDrawerAnimation: const AnimationStyle(
+                      duration: Duration(seconds: 2),
+                      reverseDuration: Duration(seconds: 1),
                     ),
                   ),
                   onDeleted: showDeleteIcon ? () {} : null,
diff --git a/examples/api/lib/material/expansion_tile/expansion_tile.2.dart b/examples/api/lib/material/expansion_tile/expansion_tile.2.dart
index 298e45e589..99d2b327a4 100644
--- a/examples/api/lib/material/expansion_tile/expansion_tile.2.dart
+++ b/examples/api/lib/material/expansion_tile/expansion_tile.2.dart
@@ -46,7 +46,7 @@ class _ExpansionTileAnimationStyleAppState extends State<ExpansionTileAnimationS
                       case AnimationStyles.defaultStyle:
                         _animationStyle = null;
                       case AnimationStyles.custom:
-                        _animationStyle = AnimationStyle(
+                        _animationStyle = const AnimationStyle(
                           curve: Easing.emphasizedAccelerate,
                           duration: Durations.extralong1,
                         );
diff --git a/examples/api/lib/material/popup_menu/popup_menu.2.dart b/examples/api/lib/material/popup_menu/popup_menu.2.dart
index 1ca7bfd011..dc8f2ac401 100644
--- a/examples/api/lib/material/popup_menu/popup_menu.2.dart
+++ b/examples/api/lib/material/popup_menu/popup_menu.2.dart
@@ -59,9 +59,9 @@ class _PopupMenuExampleState extends State<PopupMenuExample> {
                         case AnimationStyles.defaultStyle:
                           _animationStyle = null;
                         case AnimationStyles.custom:
-                          _animationStyle = AnimationStyle(
+                          _animationStyle = const AnimationStyle(
                             curve: Easing.emphasizedDecelerate,
-                            duration: const Duration(seconds: 3),
+                            duration: Duration(seconds: 3),
                           );
                         case AnimationStyles.none:
                           _animationStyle = AnimationStyle.noAnimation;
diff --git a/examples/api/lib/material/scaffold/scaffold_messenger_state.show_snack_bar.2.dart b/examples/api/lib/material/scaffold/scaffold_messenger_state.show_snack_bar.2.dart
index 734da5ac61..13fa8bcacf 100644
--- a/examples/api/lib/material/scaffold/scaffold_messenger_state.show_snack_bar.2.dart
+++ b/examples/api/lib/material/scaffold/scaffold_messenger_state.show_snack_bar.2.dart
@@ -50,9 +50,9 @@ class _SnackBarExampleState extends State<SnackBarExample> {
                 setState(() {
                   _animationStyle = switch (styles.first) {
                     AnimationStyles.defaultStyle => null,
-                    AnimationStyles.custom => AnimationStyle(
-                      duration: const Duration(seconds: 3),
-                      reverseDuration: const Duration(seconds: 1),
+                    AnimationStyles.custom => const AnimationStyle(
+                      duration: Duration(seconds: 3),
+                      reverseDuration: Duration(seconds: 1),
                     ),
                     AnimationStyles.none => AnimationStyle.noAnimation,
                   };
diff --git a/examples/api/lib/material/scaffold/scaffold_state.show_bottom_sheet.1.dart b/examples/api/lib/material/scaffold/scaffold_state.show_bottom_sheet.1.dart
index 6484a3d71a..3853993603 100644
--- a/examples/api/lib/material/scaffold/scaffold_state.show_bottom_sheet.1.dart
+++ b/examples/api/lib/material/scaffold/scaffold_state.show_bottom_sheet.1.dart
@@ -53,9 +53,9 @@ class _ShowBottomSheetExampleState extends State<ShowBottomSheetExample> {
               setState(() {
                 _animationStyle = switch (styles.first) {
                   AnimationStyles.defaultStyle => null,
-                  AnimationStyles.custom => AnimationStyle(
-                    duration: const Duration(seconds: 3),
-                    reverseDuration: const Duration(seconds: 1),
+                  AnimationStyles.custom => const AnimationStyle(
+                    duration: Duration(seconds: 3),
+                    reverseDuration: Duration(seconds: 1),
                   ),
                   AnimationStyles.none => AnimationStyle.noAnimation,
                 };
diff --git a/packages/flutter/lib/src/animation/animation_style.dart b/packages/flutter/lib/src/animation/animation_style.dart
index 6aaf43340d..6d2d979aaa 100644
--- a/packages/flutter/lib/src/animation/animation_style.dart
+++ b/packages/flutter/lib/src/animation/animation_style.dart
@@ -28,10 +28,10 @@ import 'tween.dart';
 @immutable
 class AnimationStyle with Diagnosticable {
   /// Creates an instance of Animation Style class.
-  AnimationStyle({this.curve, this.duration, this.reverseCurve, this.reverseDuration});
+  const AnimationStyle({this.curve, this.duration, this.reverseCurve, this.reverseDuration});
 
   /// Creates an instance of Animation Style class with no animation.
-  static AnimationStyle noAnimation = AnimationStyle(
+  static const AnimationStyle noAnimation = AnimationStyle(
     duration: Duration.zero,
     reverseDuration: Duration.zero,
   );
diff --git a/packages/flutter/lib/src/widgets/sliver_tree.dart b/packages/flutter/lib/src/widgets/sliver_tree.dart
index 5e8ef084f3..99be3a3dfe 100644
--- a/packages/flutter/lib/src/widgets/sliver_tree.dart
+++ b/packages/flutter/lib/src/widgets/sliver_tree.dart
@@ -490,7 +490,7 @@ class TreeSliver<T> extends StatefulWidget {
 
   /// The default [AnimationStyle] used for node expand and collapse animations,
   /// when one has not been provided in [toggleAnimationStyle].
-  static AnimationStyle defaultToggleAnimationStyle = AnimationStyle(
+  static AnimationStyle defaultToggleAnimationStyle = const AnimationStyle(
     curve: defaultAnimationCurve,
     duration: defaultAnimationDuration,
   );
diff --git a/packages/flutter/test/animation/animation_style_test.dart b/packages/flutter/test/animation/animation_style_test.dart
index b624f75443..d7ef6fb2f2 100644
--- a/packages/flutter/test/animation/animation_style_test.dart
+++ b/packages/flutter/test/animation/animation_style_test.dart
@@ -8,16 +8,16 @@ import 'package:flutter_test/flutter_test.dart';
 
 void main() {
   test('copyWith, ==, hashCode basics', () {
-    expect(AnimationStyle(), AnimationStyle().copyWith());
-    expect(AnimationStyle().hashCode, AnimationStyle().copyWith().hashCode);
+    expect(const AnimationStyle(), const AnimationStyle().copyWith());
+    expect(const AnimationStyle().hashCode, const AnimationStyle().copyWith().hashCode);
   });
 
   testWidgets('AnimationStyle.copyWith() overrides all properties', (WidgetTester tester) async {
-    final AnimationStyle original = AnimationStyle(
+    const AnimationStyle original = AnimationStyle(
       curve: Curves.ease,
-      duration: const Duration(seconds: 1),
+      duration: Duration(seconds: 1),
       reverseCurve: Curves.ease,
-      reverseDuration: const Duration(seconds: 1),
+      reverseDuration: Duration(seconds: 1),
     );
     final AnimationStyle copy = original.copyWith(
       curve: Curves.linear,
@@ -33,22 +33,22 @@ void main() {
 
   test('AnimationStyle.lerp identical a,b', () {
     expect(AnimationStyle.lerp(null, null, 0), null);
-    final AnimationStyle data = AnimationStyle();
+    const AnimationStyle data = AnimationStyle();
     expect(identical(AnimationStyle.lerp(data, data, 0.5), data), true);
   });
 
   testWidgets('default AnimationStyle debugFillProperties', (WidgetTester tester) async {
-    final AnimationStyle a = AnimationStyle(
+    const AnimationStyle a = AnimationStyle(
       curve: Curves.ease,
-      duration: const Duration(seconds: 1),
+      duration: Duration(seconds: 1),
       reverseCurve: Curves.ease,
-      reverseDuration: const Duration(seconds: 1),
+      reverseDuration: Duration(seconds: 1),
     );
-    final AnimationStyle b = AnimationStyle(
+    const AnimationStyle b = AnimationStyle(
       curve: Curves.linear,
-      duration: const Duration(seconds: 2),
+      duration: Duration(seconds: 2),
       reverseCurve: Curves.linear,
-      reverseDuration: const Duration(seconds: 2),
+      reverseDuration: Duration(seconds: 2),
     );
 
     expect(AnimationStyle.lerp(a, b, 0), a);
@@ -59,7 +59,7 @@ void main() {
   testWidgets('default AnimationStyle debugFillProperties', (WidgetTester tester) async {
     final DiagnosticPropertiesBuilder builder = DiagnosticPropertiesBuilder();
 
-    AnimationStyle().debugFillProperties(builder);
+    const AnimationStyle().debugFillProperties(builder);
 
     final List<String> description =
         builder.properties
@@ -73,11 +73,11 @@ void main() {
   testWidgets('AnimationStyle implements debugFillProperties', (WidgetTester tester) async {
     final DiagnosticPropertiesBuilder builder = DiagnosticPropertiesBuilder();
 
-    AnimationStyle(
+    const AnimationStyle(
       curve: Curves.easeInOut,
-      duration: const Duration(seconds: 1),
+      duration: Duration(seconds: 1),
       reverseCurve: Curves.bounceInOut,
-      reverseDuration: const Duration(seconds: 2),
+      reverseDuration: Duration(seconds: 2),
     ).debugFillProperties(builder);
 
     final List<String> description =
diff --git a/packages/flutter/test/material/action_chip_test.dart b/packages/flutter/test/material/action_chip_test.dart
index a26aed721d..61f06e015d 100644
--- a/packages/flutter/test/material/action_chip_test.dart
+++ b/packages/flutter/test/material/action_chip_test.dart
@@ -443,7 +443,7 @@ void main() {
 
   testWidgets('ActionChip.chipAnimationStyle is passed to RawChip', (WidgetTester tester) async {
     final ChipAnimationStyle chipAnimationStyle = ChipAnimationStyle(
-      enableAnimation: AnimationStyle(duration: Durations.extralong4),
+      enableAnimation: const AnimationStyle(duration: Durations.extralong4),
       selectAnimation: AnimationStyle.noAnimation,
     );
 
@@ -465,7 +465,7 @@ void main() {
     WidgetTester tester,
   ) async {
     final ChipAnimationStyle chipAnimationStyle = ChipAnimationStyle(
-      enableAnimation: AnimationStyle(duration: Durations.extralong4),
+      enableAnimation: const AnimationStyle(duration: Durations.extralong4),
       selectAnimation: AnimationStyle.noAnimation,
     );
 
diff --git a/packages/flutter/test/material/app_test.dart b/packages/flutter/test/material/app_test.dart
index 828017deec..10b5523085 100644
--- a/packages/flutter/test/material/app_test.dart
+++ b/packages/flutter/test/material/app_test.dart
@@ -1628,7 +1628,10 @@ void main() {
 
     // Switch to dark theme with overridden animation curve.
     await tester.pumpWidget(
-      buildWidget(themeMode: ThemeMode.dark, animationStyle: AnimationStyle(curve: Curves.easeIn)),
+      buildWidget(
+        themeMode: ThemeMode.dark,
+        animationStyle: const AnimationStyle(curve: Curves.easeIn),
+      ),
     );
     await tester.pump();
     await tester.pump(const Duration(milliseconds: 50));
@@ -1667,12 +1670,12 @@ void main() {
   testWidgets('AnimationStyle.noAnimation removes AnimatedTheme from the tree', (
     WidgetTester tester,
   ) async {
-    await tester.pumpWidget(MaterialApp(themeAnimationStyle: AnimationStyle()));
+    await tester.pumpWidget(const MaterialApp(themeAnimationStyle: AnimationStyle()));
 
     expect(find.byType(AnimatedTheme), findsOneWidget);
     expect(find.byType(Theme), findsOneWidget);
 
-    await tester.pumpWidget(MaterialApp(themeAnimationStyle: AnimationStyle.noAnimation));
+    await tester.pumpWidget(const MaterialApp(themeAnimationStyle: AnimationStyle.noAnimation));
 
     expect(find.byType(AnimatedTheme), findsNothing);
     expect(find.byType(Theme), findsOneWidget);
diff --git a/packages/flutter/test/material/bottom_sheet_test.dart b/packages/flutter/test/material/bottom_sheet_test.dart
index b5a2e7f069..80d684484e 100644
--- a/packages/flutter/test/material/bottom_sheet_test.dart
+++ b/packages/flutter/test/material/bottom_sheet_test.dart
@@ -2463,9 +2463,9 @@ void main() {
     // Test custom animation style.
     await tester.pumpWidget(
       buildWidget(
-        sheetAnimationStyle: AnimationStyle(
-          duration: const Duration(milliseconds: 800),
-          reverseDuration: const Duration(milliseconds: 400),
+        sheetAnimationStyle: const AnimationStyle(
+          duration: Duration(milliseconds: 800),
+          reverseDuration: Duration(milliseconds: 400),
         ),
       ),
     );
@@ -2623,9 +2623,9 @@ void main() {
     // Test custom animation style.
     await tester.pumpWidget(
       buildWidget(
-        sheetAnimationStyle: AnimationStyle(
-          duration: const Duration(milliseconds: 800),
-          reverseDuration: const Duration(milliseconds: 400),
+        sheetAnimationStyle: const AnimationStyle(
+          duration: Duration(milliseconds: 800),
+          reverseDuration: Duration(milliseconds: 400),
         ),
       ),
     );
diff --git a/packages/flutter/test/material/chip_test.dart b/packages/flutter/test/material/chip_test.dart
index 9cf2fd7b0d..7e3f21145f 100644
--- a/packages/flutter/test/material/chip_test.dart
+++ b/packages/flutter/test/material/chip_test.dart
@@ -5764,9 +5764,9 @@ void main() {
                   children: <Widget>[
                     RawChip(
                       chipAnimationStyle: ChipAnimationStyle(
-                        enableAnimation: AnimationStyle(
-                          duration: const Duration(milliseconds: 300),
-                          reverseDuration: const Duration(milliseconds: 150),
+                        enableAnimation: const AnimationStyle(
+                          duration: Duration(milliseconds: 300),
+                          reverseDuration: Duration(milliseconds: 150),
                         ),
                       ),
                       isEnabled: enabled,
@@ -5839,9 +5839,9 @@ void main() {
                   children: <Widget>[
                     RawChip(
                       chipAnimationStyle: ChipAnimationStyle(
-                        selectAnimation: AnimationStyle(
-                          duration: const Duration(milliseconds: 600),
-                          reverseDuration: const Duration(milliseconds: 300),
+                        selectAnimation: const AnimationStyle(
+                          duration: Duration(milliseconds: 600),
+                          reverseDuration: Duration(milliseconds: 300),
                         ),
                       ),
                       backgroundColor: backgroundColor,
@@ -5914,9 +5914,9 @@ void main() {
                     children: <Widget>[
                       RawChip(
                         chipAnimationStyle: ChipAnimationStyle(
-                          avatarDrawerAnimation: AnimationStyle(
-                            duration: const Duration(milliseconds: 800),
-                            reverseDuration: const Duration(milliseconds: 400),
+                          avatarDrawerAnimation: const AnimationStyle(
+                            duration: Duration(milliseconds: 800),
+                            reverseDuration: Duration(milliseconds: 400),
                           ),
                         ),
                         checkmarkColor: checkmarkColor,
@@ -5993,9 +5993,9 @@ void main() {
                     children: <Widget>[
                       RawChip(
                         chipAnimationStyle: ChipAnimationStyle(
-                          deleteDrawerAnimation: AnimationStyle(
-                            duration: const Duration(milliseconds: 500),
-                            reverseDuration: const Duration(milliseconds: 250),
+                          deleteDrawerAnimation: const AnimationStyle(
+                            duration: Duration(milliseconds: 500),
+                            reverseDuration: Duration(milliseconds: 250),
                           ),
                         ),
                         onDeleted: showDeleteIcon ? () {} : null,
@@ -6054,7 +6054,7 @@ void main() {
   testWidgets('Chip.chipAnimationStyle is passed to RawChip', (WidgetTester tester) async {
     final ChipAnimationStyle chipAnimationStyle = ChipAnimationStyle(
       enableAnimation: AnimationStyle.noAnimation,
-      selectAnimation: AnimationStyle(duration: Durations.long3),
+      selectAnimation: const AnimationStyle(duration: Durations.long3),
     );
 
     await tester.pumpWidget(
diff --git a/packages/flutter/test/material/choice_chip_test.dart b/packages/flutter/test/material/choice_chip_test.dart
index 558c239bf9..fe9653acd7 100644
--- a/packages/flutter/test/material/choice_chip_test.dart
+++ b/packages/flutter/test/material/choice_chip_test.dart
@@ -724,7 +724,7 @@ void main() {
 
   testWidgets('ChoiceChip.chipAnimationStyle is passed to RawChip', (WidgetTester tester) async {
     final ChipAnimationStyle chipAnimationStyle = ChipAnimationStyle(
-      enableAnimation: AnimationStyle(duration: Durations.extralong4),
+      enableAnimation: const AnimationStyle(duration: Durations.extralong4),
       selectAnimation: AnimationStyle.noAnimation,
     );
 
@@ -747,7 +747,7 @@ void main() {
     WidgetTester tester,
   ) async {
     final ChipAnimationStyle chipAnimationStyle = ChipAnimationStyle(
-      enableAnimation: AnimationStyle(duration: Durations.extralong4),
+      enableAnimation: const AnimationStyle(duration: Durations.extralong4),
       selectAnimation: AnimationStyle.noAnimation,
     );
 
diff --git a/packages/flutter/test/material/expansion_tile_test.dart b/packages/flutter/test/material/expansion_tile_test.dart
index 18ad99e0e9..14b168c15d 100644
--- a/packages/flutter/test/material/expansion_tile_test.dart
+++ b/packages/flutter/test/material/expansion_tile_test.dart
@@ -1194,7 +1194,7 @@ void main() {
     // Override the animation duration.
     await tester.pumpWidget(
       buildExpansionTile(
-        animationStyle: AnimationStyle(duration: const Duration(milliseconds: 800)),
+        animationStyle: const AnimationStyle(duration: Duration(milliseconds: 800)),
       ),
     );
     await tester.pumpAndSettle();
@@ -1225,7 +1225,7 @@ void main() {
     // Override the animation curve.
     await tester.pumpWidget(
       buildExpansionTile(
-        animationStyle: AnimationStyle(
+        animationStyle: const AnimationStyle(
           curve: Easing.emphasizedDecelerate,
           reverseCurve: Easing.emphasizedAccelerate,
         ),
diff --git a/packages/flutter/test/material/expansion_tile_theme_test.dart b/packages/flutter/test/material/expansion_tile_theme_test.dart
index 7bd1b864c8..24ef0dc385 100644
--- a/packages/flutter/test/material/expansion_tile_theme_test.dart
+++ b/packages/flutter/test/material/expansion_tile_theme_test.dart
@@ -100,18 +100,18 @@ void main() {
 
   testWidgets('ExpansionTileThemeData implements debugFillProperties', (WidgetTester tester) async {
     final DiagnosticPropertiesBuilder builder = DiagnosticPropertiesBuilder();
-    ExpansionTileThemeData(
-      backgroundColor: const Color(0xff000000),
-      collapsedBackgroundColor: const Color(0xff6f83fc),
-      tilePadding: const EdgeInsets.all(20.0),
+    const ExpansionTileThemeData(
+      backgroundColor: Color(0xff000000),
+      collapsedBackgroundColor: Color(0xff6f83fc),
+      tilePadding: EdgeInsets.all(20.0),
       expandedAlignment: Alignment.bottomCenter,
-      childrenPadding: const EdgeInsets.all(10.0),
-      iconColor: const Color(0xffa7c61c),
-      collapsedIconColor: const Color(0xffdd0b1f),
-      textColor: const Color(0xffffffff),
-      collapsedTextColor: const Color(0xff522bab),
-      shape: const Border(),
-      collapsedShape: const Border(),
+      childrenPadding: EdgeInsets.all(10.0),
+      iconColor: Color(0xffa7c61c),
+      collapsedIconColor: Color(0xffdd0b1f),
+      textColor: Color(0xffffffff),
+      collapsedTextColor: Color(0xff522bab),
+      shape: Border(),
+      collapsedShape: Border(),
       clipBehavior: Clip.antiAlias,
       expansionAnimationStyle: AnimationStyle(curve: Curves.easeInOut),
     ).debugFillProperties(builder);
@@ -382,7 +382,7 @@ void main() {
     // Override the animation duration.
     await tester.pumpWidget(
       buildExpansionTile(
-        animationStyle: AnimationStyle(duration: const Duration(milliseconds: 800)),
+        animationStyle: const AnimationStyle(duration: Duration(milliseconds: 800)),
       ),
     );
     await tester.pumpAndSettle();
@@ -412,7 +412,7 @@ void main() {
 
     // Override the animation curve.
     await tester.pumpWidget(
-      buildExpansionTile(animationStyle: AnimationStyle(curve: Easing.emphasizedDecelerate)),
+      buildExpansionTile(animationStyle: const AnimationStyle(curve: Easing.emphasizedDecelerate)),
     );
     await tester.pumpAndSettle();
 
diff --git a/packages/flutter/test/material/filter_chip_test.dart b/packages/flutter/test/material/filter_chip_test.dart
index 8036968138..baefedb678 100644
--- a/packages/flutter/test/material/filter_chip_test.dart
+++ b/packages/flutter/test/material/filter_chip_test.dart
@@ -1222,7 +1222,7 @@ void main() {
   testWidgets('FilterChip.chipAnimationStyle is passed to RawChip', (WidgetTester tester) async {
     final ChipAnimationStyle chipAnimationStyle = ChipAnimationStyle(
       enableAnimation: AnimationStyle.noAnimation,
-      selectAnimation: AnimationStyle(duration: Durations.extralong4),
+      selectAnimation: const AnimationStyle(duration: Durations.extralong4),
     );
 
     await tester.pumpWidget(
@@ -1245,7 +1245,7 @@ void main() {
   ) async {
     final ChipAnimationStyle chipAnimationStyle = ChipAnimationStyle(
       enableAnimation: AnimationStyle.noAnimation,
-      selectAnimation: AnimationStyle(duration: Durations.extralong4),
+      selectAnimation: const AnimationStyle(duration: Durations.extralong4),
     );
 
     await tester.pumpWidget(
diff --git a/packages/flutter/test/material/input_chip_test.dart b/packages/flutter/test/material/input_chip_test.dart
index 9f734ac80f..0deafa2ac8 100644
--- a/packages/flutter/test/material/input_chip_test.dart
+++ b/packages/flutter/test/material/input_chip_test.dart
@@ -585,7 +585,7 @@ void main() {
 
   testWidgets('InputChip.chipAnimationStyle is passed to RawChip', (WidgetTester tester) async {
     final ChipAnimationStyle chipAnimationStyle = ChipAnimationStyle(
-      enableAnimation: AnimationStyle(duration: Durations.short2),
+      enableAnimation: const AnimationStyle(duration: Durations.short2),
       selectAnimation: AnimationStyle.noAnimation,
     );
 
diff --git a/packages/flutter/test/material/popup_menu_test.dart b/packages/flutter/test/material/popup_menu_test.dart
index c9cf09c1cd..e400736e51 100644
--- a/packages/flutter/test/material/popup_menu_test.dart
+++ b/packages/flutter/test/material/popup_menu_test.dart
@@ -4103,7 +4103,7 @@ void main() {
 
     // Override the animation duration.
     await tester.pumpWidget(
-      buildPopupMenu(animationStyle: AnimationStyle(duration: Duration.zero)),
+      buildPopupMenu(animationStyle: const AnimationStyle(duration: Duration.zero)),
     );
 
     await tester.tap(find.byKey(targetKey));
@@ -4121,7 +4121,7 @@ void main() {
 
     // Override the animation curve.
     await tester.pumpWidget(
-      buildPopupMenu(animationStyle: AnimationStyle(curve: Easing.emphasizedAccelerate)),
+      buildPopupMenu(animationStyle: const AnimationStyle(curve: Easing.emphasizedAccelerate)),
     );
 
     await tester.tap(find.byKey(targetKey));
diff --git a/packages/flutter/test/material/scaffold_test.dart b/packages/flutter/test/material/scaffold_test.dart
index 2079e4fcaa..7f8125bffb 100644
--- a/packages/flutter/test/material/scaffold_test.dart
+++ b/packages/flutter/test/material/scaffold_test.dart
@@ -2954,9 +2954,9 @@ void main() {
                 onPressed: () {
                   ScaffoldMessenger.of(context).showSnackBar(
                     const SnackBar(content: Text('I am a snack bar.'), showCloseIcon: true),
-                    snackBarAnimationStyle: AnimationStyle(
-                      duration: const Duration(milliseconds: 1200),
-                      reverseDuration: const Duration(milliseconds: 600),
+                    snackBarAnimationStyle: const AnimationStyle(
+                      duration: Duration(milliseconds: 1200),
+                      reverseDuration: Duration(milliseconds: 600),
                     ),
                   );
                 },
@@ -3026,9 +3026,9 @@ void main() {
     // Test custom animation style.
     await tester.pumpWidget(
       buildSnackBar(
-        AnimationStyle(
-          duration: const Duration(milliseconds: 800),
-          reverseDuration: const Duration(milliseconds: 400),
+        const AnimationStyle(
+          duration: Duration(milliseconds: 800),
+          reverseDuration: Duration(milliseconds: 400),
         ),
       ),
     );
@@ -3098,7 +3098,7 @@ void main() {
 
     // Test custom animation style with only reverseDuration.
     await tester.pumpWidget(
-      buildSnackBar(AnimationStyle(reverseDuration: const Duration(milliseconds: 400))),
+      buildSnackBar(const AnimationStyle(reverseDuration: Duration(milliseconds: 400))),
     );
 
     // Tap the button to show the SnackBar.
@@ -3235,9 +3235,9 @@ void main() {
     // Test custom animation style.
     await tester.pumpWidget(
       buildWidget(
-        sheetAnimationStyle: AnimationStyle(
-          duration: const Duration(milliseconds: 800),
-          reverseDuration: const Duration(milliseconds: 400),
+        sheetAnimationStyle: const AnimationStyle(
+          duration: Duration(milliseconds: 800),
+          reverseDuration: Duration(milliseconds: 400),
         ),
       ),
     );
diff --git a/packages/flutter/test/rendering/sliver_tree_test.dart b/packages/flutter/test/rendering/sliver_tree_test.dart
index bc83ab014f..b8d2314019 100644
--- a/packages/flutter/test/rendering/sliver_tree_test.dart
+++ b/packages/flutter/test/rendering/sliver_tree_test.dart
@@ -338,8 +338,8 @@ void main() {
     // Customize the animation
     treeSliver = TreeSliver<String>(
       tree: treeNodes,
-      toggleAnimationStyle: AnimationStyle(
-        duration: const Duration(milliseconds: 500),
+      toggleAnimationStyle: const AnimationStyle(
+        duration: Duration(milliseconds: 500),
         curve: Curves.bounceIn,
       ),
     );
diff --git a/packages/flutter/test/widgets/sliver_floating_header_test.dart b/packages/flutter/test/widgets/sliver_floating_header_test.dart
index 4374df7fc0..6c94ecc4d6 100644
--- a/packages/flutter/test/widgets/sliver_floating_header_test.dart
+++ b/packages/flutter/test/widgets/sliver_floating_header_test.dart
@@ -178,14 +178,14 @@ void main() {
         home: Scaffold(
           body: CustomScrollView(
             slivers: <Widget>[
-              SliverFloatingHeader(
+              const SliverFloatingHeader(
                 animationStyle: AnimationStyle(
                   curve: Curves.linear,
                   reverseCurve: Curves.linear,
-                  duration: const Duration(seconds: 1),
-                  reverseDuration: const Duration(seconds: 1),
+                  duration: Duration(seconds: 1),
+                  reverseDuration: Duration(seconds: 1),
                 ),
-                child: const SizedBox(height: 200, child: Text('header')),
+                child: SizedBox(height: 200, child: Text('header')),
               ),
               SliverList(
                 delegate: SliverChildBuilderDelegate((BuildContext context, int index) {
diff --git a/packages/flutter/test/widgets/sliver_tree_test.dart b/packages/flutter/test/widgets/sliver_tree_test.dart
index 9c3fc4020d..d5ff22b297 100644
--- a/packages/flutter/test/widgets/sliver_tree_test.dart
+++ b/packages/flutter/test/widgets/sliver_tree_test.dart
@@ -531,9 +531,9 @@ void main() {
           slivers: <Widget>[
             TreeSliver<String>(
               tree: simpleNodeSet,
-              toggleAnimationStyle: AnimationStyle(
+              toggleAnimationStyle: const AnimationStyle(
                 curve: Curves.easeIn,
-                duration: const Duration(milliseconds: 200),
+                duration: Duration(milliseconds: 200),
               ),
               treeNodeBuilder: (
                 BuildContext context,
@@ -819,9 +819,9 @@ void main() {
                 TreeSliver<String>(
                   tree: tree,
                   controller: controller,
-                  toggleAnimationStyle: AnimationStyle(
+                  toggleAnimationStyle: const AnimationStyle(
                     curve: Curves.easeInOut,
-                    duration: const Duration(milliseconds: 200),
+                    duration: Duration(milliseconds: 200),
                   ),
                   treeNodeBuilder: (
                     BuildContext context,