[material_ui] Migrate M3 Divider template to use new gen_defaults

packages/material_ui/lib/src/divider.dart

@@ -13,6 +13,8 @@ import 'package:flutter/widgets.dart';
 import 'divider_theme.dart';
 import 'theme.dart';
 
+part 'generated/divider_defaults_m3.g.dart';
+
 // Examples can assume:
 // late BuildContext context;
 
@@ -383,27 +385,3 @@ class _DividerDefaultsM2 extends DividerThemeData {
   @override
   Color? get color => Theme.of(context).dividerColor;
 }
-
-// BEGIN GENERATED TOKEN PROPERTIES - Divider
-
-// Do not edit by hand. The code between the "BEGIN GENERATED" and
-// "END GENERATED" comments are generated from data in the Material
-// Design token database by the script:
-//   dev/tools/gen_defaults/bin/gen_defaults.dart.
-
-// dart format off
-class _DividerDefaultsM3 extends DividerThemeData {
-  const _DividerDefaultsM3(this.context) : super(
-    space: 16,
-    thickness: 1.0,
-    indent: 0,
-    endIndent: 0,
-  );
-
-  final BuildContext context;
-
-  @override Color? get color => Theme.of(context).colorScheme.outlineVariant;
-}
-// dart format on
-
-// END GENERATED TOKEN PROPERTIES - Divider

packages/material_ui/tool/gen_defaults/temporarily_excluded/generated/divider_defaults.g.dart → packages/material_ui/lib/src/generated/divider_defaults_m3.g.dart

@@ -2,6 +2,11 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// Do not edit by hand. The code is generated from data in the Material
+// Design token database by the script:
+//   packages/material_ui/tool/gen_defaults/bin/gen_defaults.dart.
+part of '../divider.dart';
+
 class _DividerDefaultsM3 extends DividerThemeData {
   const _DividerDefaultsM3(this.context)
     : super(space: 16, thickness: 1.0, indent: 0, endIndent: 0);

packages/material_ui/tool/gen_defaults/bin/gen_defaults.dart

@@ -25,7 +25,8 @@ import '../templates/chip_template.dart';
 import '../templates/color_scheme_template.dart';
 // import '../templates/date_picker_template.dart';
 // import '../templates/dialog_template.dart';
-// import '../templates/divider_template.dart';
+import '../templates/divider_template.dart';
+
 // import '../templates/drawer_template.dart';
 // import '../templates/expansion_tile_template.dart';
 // import '../templates/fab_template.dart';
@@ -84,7 +85,7 @@ Future<void> main(List<String> args) async {
   const ColorSchemeTemplateM3().generateFile(verbose: verbose);
   // const DatePickerTemplateM3().generateFile(verbose: verbose);
   // const DialogTemplateM3().generateFile(verbose: verbose);
-  // const DividerTemplateM3().generateFile(verbose: verbose);
+  const DividerTemplateM3().generateFile(verbose: verbose);
   // const DrawerTemplateM3().generateFile(verbose: verbose);
   // const ExpansionTileTemplateM3().generateFile(verbose: verbose);
   // const FabTemplateM3().generateFile(verbose: verbose);

packages/material_ui/tool/gen_defaults/templates/divider_template.dart

@@ -0,0 +1,33 @@
+// Copyright 2013 The Flutter Authors
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import '../data/divider.dart';
+import 'template.dart';
+
+class DividerTemplateM3 extends TokenTemplateM3 {
+  const DividerTemplateM3();
+
+  @override
+  String get name => 'Divider';
+
+  @override
+  String get parentFilePath => 'divider.dart';
+
+  @override
+  String generateContents(String className) =>
+      '''
+class $className extends DividerThemeData {
+  const $className(this.context) : super(
+    space: 16,
+    thickness: ${TokenDivider.thickness},
+    indent: 0,
+    endIndent: 0,
+  );
+
+  final BuildContext context;
+
+  @override Color? get color => ${color(TokenDivider.color, 'Theme.of(context).colorScheme')};
+}
+''';
+}

packages/material_ui/tool/gen_defaults/test/gen_defaults_test.dart

@@ -22,7 +22,7 @@ import '../templates/chip_template.dart';
 import '../templates/color_scheme_template.dart';
 // import '../templates/date_picker_template.dart';
 // import '../templates/dialog_template.dart';
-// import '../templates/divider_template.dart';
+import '../templates/divider_template.dart';
 // import '../templates/drawer_template.dart';
 // import '../templates/expansion_tile_template.dart';
 // import '../templates/fab_template.dart';
@@ -552,8 +552,13 @@ void main() {
     });
 
     test('DividerTemplateM3 emits M3 Divider defaults from tokens', () {
-      // Intentionally empty, will be implemented during migration. See:
-      // https://github.com/flutter/flutter/issues/187899
+      final String contents = _generateContents(const DividerTemplateM3());
+      expect(contents, contains('class _DividerDefaultsM3 extends DividerThemeData'));
+      expect(contents, contains('thickness: 1.0'));
+      expect(
+        contents,
+        contains('Color? get color => Theme.of(context).colorScheme.outlineVariant;'),
+      );
     });
 
     test('DrawerTemplateM3 emits M3 Drawer defaults from tokens', () {