Gallery accessibility test: check default themes, gallery themes (#22141)

examples/flutter_gallery/test/accessibility_test.dart

 import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:flutter_gallery/demo/all.dart';
+import 'package:flutter_gallery/gallery/themes.dart';
 
 void main() {
   group('All material demos meet recommended tap target sizes', () {
@@ -237,235 +238,252 @@ void main() {
   });
 
   group('All material demos meet text contrast guidelines', () {
-    testWidgets('backdrop_demo', (WidgetTester tester) async {
+    final List<ThemeData> themes = <ThemeData>[
+      kLightGalleryTheme.data,
+      ThemeData.light(),
+      // TODO(hansmuller): add kDarkGalleryTheme.data, ThemeData.dark(), see #22044
+    ];
+
+    const List<String> themeNames = <String>[
+      'kLightGalleryTheme',
+      'ThemeData.light()',
+      // TODO(hansmuller): add 'kDarkGalleryTheme', 'ThemeData.dark()', see 22044
+    ];
+
+    for (int themeIndex = 0; themeIndex < themes.length; themeIndex += 1) {
+      final ThemeData theme = themes[themeIndex];
+      final String themeName = themeNames[themeIndex];
+
+      testWidgets('backdrop_demo $themeName', (WidgetTester tester) async {
         final SemanticsHandle handle = tester.ensureSemantics();
-      await tester.pumpWidget(MaterialApp(home: BackdropDemo()));
+        await tester.pumpWidget(MaterialApp(theme: theme, home: BackdropDemo()));
         await expectLater(tester, meetsGuideline(textContrastGuideline));
         handle.dispose();
       });
 
-    testWidgets('bottom_app_bar_demo', (WidgetTester tester) async {
+      testWidgets('bottom_app_bar_demo $themeName', (WidgetTester tester) async {
         final SemanticsHandle handle = tester.ensureSemantics();
-      await tester.pumpWidget(MaterialApp(home: BottomAppBarDemo()));
+        await tester.pumpWidget(MaterialApp(theme: theme, home: BottomAppBarDemo()));
         await expectLater(tester, meetsGuideline(textContrastGuideline));
         handle.dispose();
       }, skip: true); // https://github.com/flutter/flutter/issues/21651
 
-    testWidgets('bottom_navigation_demo', (WidgetTester tester) async {
+      testWidgets('bottom_navigation_demo $themeName', (WidgetTester tester) async {
         final SemanticsHandle handle = tester.ensureSemantics();
-      await tester.pumpWidget(MaterialApp(home: BottomNavigationDemo()));
+        await tester.pumpWidget(MaterialApp(theme: theme, home: BottomNavigationDemo()));
         await expectLater(tester, meetsGuideline(textContrastGuideline));
         handle.dispose();
       });
 
-    testWidgets('buttons_demo', (WidgetTester tester) async {
+      testWidgets('buttons_demo $themeName', (WidgetTester tester) async {
         final SemanticsHandle handle = tester.ensureSemantics();
-      await tester.pumpWidget(MaterialApp(home: ButtonsDemo()));
+        await tester.pumpWidget(MaterialApp(theme: theme, home: ButtonsDemo()));
         await expectLater(tester, meetsGuideline(textContrastGuideline));
         handle.dispose();
       }, skip: true); // https://github.com/flutter/flutter/issues/21647
 
-    testWidgets('cards_demo', (WidgetTester tester) async {
+      testWidgets('cards_demo $themeName', (WidgetTester tester) async {
         final SemanticsHandle handle = tester.ensureSemantics();
-      await tester.pumpWidget(MaterialApp(home: CardsDemo()));
+        await tester.pumpWidget(MaterialApp(theme: theme, home: CardsDemo()));
         await expectLater(tester, meetsGuideline(textContrastGuideline));
         handle.dispose();
       }, skip: true); // https://github.com/flutter/flutter/issues/21651
 
-    testWidgets('chip_demo', (WidgetTester tester) async {
+      testWidgets('chip_demo $themeName', (WidgetTester tester) async {
         final SemanticsHandle handle = tester.ensureSemantics();
-      await tester.pumpWidget(MaterialApp(home: ChipDemo()));
+        await tester.pumpWidget(MaterialApp(theme: theme, home: ChipDemo()));
         await expectLater(tester, meetsGuideline(textContrastGuideline));
         handle.dispose();
       }, skip: true); // https://github.com/flutter/flutter/issues/21647
 
-    testWidgets('data_table_demo', (WidgetTester tester) async {
+      testWidgets('data_table_demo $themeName', (WidgetTester tester) async {
         final SemanticsHandle handle = tester.ensureSemantics();
-      await tester.pumpWidget(MaterialApp(home: DataTableDemo()));
+        await tester.pumpWidget(MaterialApp(theme: theme, home: DataTableDemo()));
         await expectLater(tester, meetsGuideline(textContrastGuideline));
         handle.dispose();
       }, skip: true); // https://github.com/flutter/flutter/issues/21647
 
-    testWidgets('date_and_time_picker_demo', (WidgetTester tester) async {
+      testWidgets('date_and_time_picker_demo $themeName', (WidgetTester tester) async {
         final SemanticsHandle handle = tester.ensureSemantics();
-      await tester.pumpWidget(MaterialApp(home: DateAndTimePickerDemo()));
+        await tester.pumpWidget(MaterialApp(theme: theme, home: DateAndTimePickerDemo()));
         await expectLater(tester, meetsGuideline(textContrastGuideline));
         handle.dispose();
       }, skip: true); // https://github.com/flutter/flutter/issues/21647
 
-    testWidgets('dialog_demo', (WidgetTester tester) async {
+      testWidgets('dialog_demo $themeName', (WidgetTester tester) async {
         final SemanticsHandle handle = tester.ensureSemantics();
-      await tester.pumpWidget(MaterialApp(home: DialogDemo()));
+        await tester.pumpWidget(MaterialApp(theme: theme, home: DialogDemo()));
         await expectLater(tester, meetsGuideline(textContrastGuideline));
         handle.dispose();
       });
 
-    testWidgets('drawer_demo', (WidgetTester tester) async {
+      testWidgets('drawer_demo $themeName', (WidgetTester tester) async {
         final SemanticsHandle handle = tester.ensureSemantics();
-      await tester.pumpWidget(MaterialApp(home: DrawerDemo()));
+        await tester.pumpWidget(MaterialApp(theme: theme, home: DrawerDemo()));
         await expectLater(tester, meetsGuideline(textContrastGuideline));
         handle.dispose();
       });
 
-    testWidgets('elevation_demo', (WidgetTester tester) async {
+      testWidgets('elevation_demo $themeName', (WidgetTester tester) async {
         final SemanticsHandle handle = tester.ensureSemantics();
-      await tester.pumpWidget(MaterialApp(home: ElevationDemo()));
+        await tester.pumpWidget(MaterialApp(theme: theme, home: ElevationDemo()));
         await expectLater(tester, meetsGuideline(textContrastGuideline));
         handle.dispose();
       });
 
-    testWidgets('expansion_panels_demo', (WidgetTester tester) async {
+      testWidgets('expansion_panels_demo $themeName', (WidgetTester tester) async {
         final SemanticsHandle handle = tester.ensureSemantics();
-      await tester.pumpWidget(MaterialApp(home: ExpansionPanelsDemo()));
+        await tester.pumpWidget(MaterialApp(theme: theme, home: ExpansionPanelsDemo()));
         await expectLater(tester, meetsGuideline(textContrastGuideline));
         handle.dispose();
       });
 
-    testWidgets('grid_list_demo', (WidgetTester tester) async {
+      testWidgets('grid_list_demo $themeName', (WidgetTester tester) async {
         final SemanticsHandle handle = tester.ensureSemantics();
-      await tester.pumpWidget(MaterialApp(home: const GridListDemo()));
+        await tester.pumpWidget(MaterialApp(theme: theme, home: const GridListDemo()));
         await expectLater(tester, meetsGuideline(textContrastGuideline));
         handle.dispose();
       });
 
-    testWidgets('icons_demo', (WidgetTester tester) async {
+      testWidgets('icons_demo $themeName', (WidgetTester tester) async {
         final SemanticsHandle handle = tester.ensureSemantics();
-      await tester.pumpWidget(MaterialApp(home: IconsDemo()));
+        await tester.pumpWidget(MaterialApp(theme: theme, home: IconsDemo()));
         await expectLater(tester, meetsGuideline(textContrastGuideline));
         handle.dispose();
       }, skip: true); // https://github.com/flutter/flutter/issues/21647
 
-    testWidgets('leave_behind_demo', (WidgetTester tester) async {
+      testWidgets('leave_behind_demo $themeName', (WidgetTester tester) async {
         final SemanticsHandle handle = tester.ensureSemantics();
-      await tester.pumpWidget(MaterialApp(home: const LeaveBehindDemo()));
+        await tester.pumpWidget(MaterialApp(theme: theme, home: const LeaveBehindDemo()));
         await expectLater(tester, meetsGuideline(textContrastGuideline));
         handle.dispose();
       });
 
-    testWidgets('list_demo', (WidgetTester tester) async {
+      testWidgets('list_demo $themeName', (WidgetTester tester) async {
         final SemanticsHandle handle = tester.ensureSemantics();
-      await tester.pumpWidget(MaterialApp(home: const ListDemo()));
+        await tester.pumpWidget(MaterialApp(theme: theme, home: const ListDemo()));
         await expectLater(tester, meetsGuideline(textContrastGuideline));
         handle.dispose();
       });
 
-    testWidgets('menu_demo', (WidgetTester tester) async {
+      testWidgets('menu_demo $themeName', (WidgetTester tester) async {
         final SemanticsHandle handle = tester.ensureSemantics();
-      await tester.pumpWidget(MaterialApp(home: const MenuDemo()));
+        await tester.pumpWidget(MaterialApp(theme: theme, home: const MenuDemo()));
         await expectLater(tester, meetsGuideline(textContrastGuideline));
         handle.dispose();
       });
 
-    testWidgets('modal_bottom_sheet_demo', (WidgetTester tester) async {
+      testWidgets('modal_bottom_sheet_demo $themeName', (WidgetTester tester) async {
         final SemanticsHandle handle = tester.ensureSemantics();
-      await tester.pumpWidget(MaterialApp(home: ModalBottomSheetDemo()));
+        await tester.pumpWidget(MaterialApp(theme: theme, home: ModalBottomSheetDemo()));
         await expectLater(tester, meetsGuideline(textContrastGuideline));
         handle.dispose();
       });
 
-    testWidgets('overscroll_demo', (WidgetTester tester) async {
+      testWidgets('overscroll_demo $themeName', (WidgetTester tester) async {
         final SemanticsHandle handle = tester.ensureSemantics();
-      await tester.pumpWidget(MaterialApp(home: const OverscrollDemo()));
+        await tester.pumpWidget(MaterialApp(theme: theme, home: const OverscrollDemo()));
         await expectLater(tester, meetsGuideline(textContrastGuideline));
         handle.dispose();
       });
 
-    testWidgets('page_selector_demo', (WidgetTester tester) async {
+      testWidgets('page_selector_demo $themeName', (WidgetTester tester) async {
         final SemanticsHandle handle = tester.ensureSemantics();
-      await tester.pumpWidget(MaterialApp(home: PageSelectorDemo()));
+        await tester.pumpWidget(MaterialApp(theme: theme, home: PageSelectorDemo()));
         await expectLater(tester, meetsGuideline(textContrastGuideline));
         handle.dispose();
       });
 
-    testWidgets('persistent_bottom_sheet_demo', (WidgetTester tester) async {
+      testWidgets('persistent_bottom_sheet_demo $themeName', (WidgetTester tester) async {
         final SemanticsHandle handle = tester.ensureSemantics();
-      await tester.pumpWidget(MaterialApp(home: PersistentBottomSheetDemo()));
+        await tester.pumpWidget(MaterialApp(theme: theme, home: PersistentBottomSheetDemo()));
         await expectLater(tester, meetsGuideline(textContrastGuideline));
         handle.dispose();
       });
 
-    testWidgets('progress_indicator_demo', (WidgetTester tester) async {
+      testWidgets('progress_indicator_demo $themeName', (WidgetTester tester) async {
         final SemanticsHandle handle = tester.ensureSemantics();
-      await tester.pumpWidget(MaterialApp(home: ProgressIndicatorDemo()));
+        await tester.pumpWidget(MaterialApp(theme: theme, home: ProgressIndicatorDemo()));
         await expectLater(tester, meetsGuideline(textContrastGuideline));
         handle.dispose();
       });
 
-    testWidgets('reorderable_list_demo', (WidgetTester tester) async {
+      testWidgets('reorderable_list_demo $themeName', (WidgetTester tester) async {
         final SemanticsHandle handle = tester.ensureSemantics();
-      await tester.pumpWidget(MaterialApp(home: const ReorderableListDemo()));
+        await tester.pumpWidget(MaterialApp(theme: theme, home: const ReorderableListDemo()));
         await expectLater(tester, meetsGuideline(textContrastGuideline));
         handle.dispose();
       });
 
-    testWidgets('scrollable_tabs_demo', (WidgetTester tester) async {
+      testWidgets('scrollable_tabs_demo $themeName', (WidgetTester tester) async {
         final SemanticsHandle handle = tester.ensureSemantics();
-      await tester.pumpWidget(MaterialApp(home: ScrollableTabsDemo()));
+        await tester.pumpWidget(MaterialApp(theme: theme, home: ScrollableTabsDemo()));
         await expectLater(tester, meetsGuideline(textContrastGuideline));
         handle.dispose();
       });
 
-    testWidgets('search_demo', (WidgetTester tester) async {
+      testWidgets('search_demo $themeName', (WidgetTester tester) async {
         final SemanticsHandle handle = tester.ensureSemantics();
-      await tester.pumpWidget(MaterialApp(home: SearchDemo()));
+        await tester.pumpWidget(MaterialApp(theme: theme, home: SearchDemo()));
         await expectLater(tester, meetsGuideline(textContrastGuideline));
         handle.dispose();
       }, skip: true); // https://github.com/flutter/flutter/issues/21651
 
-    testWidgets('selection_controls_demo', (WidgetTester tester) async {
+      testWidgets('selection_controls_demo $themeName', (WidgetTester tester) async {
         final SemanticsHandle handle = tester.ensureSemantics();
-      await tester.pumpWidget(MaterialApp(home: SelectionControlsDemo()));
+        await tester.pumpWidget(MaterialApp(theme: theme, home: SelectionControlsDemo()));
         await expectLater(tester, meetsGuideline(textContrastGuideline));
         handle.dispose();
       });
 
-    testWidgets('slider_demo', (WidgetTester tester) async {
+      testWidgets('slider_demo $themeName', (WidgetTester tester) async {
         final SemanticsHandle handle = tester.ensureSemantics();
-      await tester.pumpWidget(MaterialApp(home: SliderDemo()));
+        await tester.pumpWidget(MaterialApp(theme: theme, home: SliderDemo()));
         await expectLater(tester, meetsGuideline(textContrastGuideline));
         handle.dispose();
       });
 
-    testWidgets('snack_bar_demo', (WidgetTester tester) async {
+      testWidgets('snack_bar_demo $themeName', (WidgetTester tester) async {
         final SemanticsHandle handle = tester.ensureSemantics();
-      await tester.pumpWidget(MaterialApp(home: const SnackBarDemo()));
+        await tester.pumpWidget(MaterialApp(theme: theme, home: const SnackBarDemo()));
         await expectLater(tester, meetsGuideline(textContrastGuideline));
         handle.dispose();
       });
 
-    testWidgets('tabs_demo', (WidgetTester tester) async {
+      testWidgets('tabs_demo $themeName', (WidgetTester tester) async {
         final SemanticsHandle handle = tester.ensureSemantics();
-      await tester.pumpWidget(MaterialApp(home: TabsDemo()));
+        await tester.pumpWidget(MaterialApp(theme: theme, home: TabsDemo()));
         await expectLater(tester, meetsGuideline(textContrastGuideline));
         handle.dispose();
       });
 
-    testWidgets('tabs_fab_demo', (WidgetTester tester) async {
+      testWidgets('tabs_fab_demo $themeName', (WidgetTester tester) async {
         final SemanticsHandle handle = tester.ensureSemantics();
-      await tester.pumpWidget(MaterialApp(home: TabsFabDemo()));
+        await tester.pumpWidget(MaterialApp(theme: theme, home: TabsFabDemo()));
         await expectLater(tester, meetsGuideline(textContrastGuideline));
         handle.dispose();
       });
 
-    testWidgets('text_form_field_demo', (WidgetTester tester) async {
+      testWidgets('text_form_field_demo $themeName', (WidgetTester tester) async {
         final SemanticsHandle handle = tester.ensureSemantics();
-      await tester.pumpWidget(MaterialApp(home: const TextFormFieldDemo()));
+        await tester.pumpWidget(MaterialApp(theme: theme, home: const TextFormFieldDemo()));
         await expectLater(tester, meetsGuideline(textContrastGuideline));
         handle.dispose();
       });
 
-    testWidgets('tooltip_demo', (WidgetTester tester) async {
+      testWidgets('tooltip_demo $themeName', (WidgetTester tester) async {
         final SemanticsHandle handle = tester.ensureSemantics();
-      await tester.pumpWidget(MaterialApp(home: TooltipDemo()));
+        await tester.pumpWidget(MaterialApp(theme: theme, home: TooltipDemo()));
         await expectLater(tester, meetsGuideline(textContrastGuideline));
         handle.dispose();
       });
 
-    testWidgets('two_level_list_demo', (WidgetTester tester) async {
+      testWidgets('two_level_list_demo $themeName', (WidgetTester tester) async {
         final SemanticsHandle handle = tester.ensureSemantics();
-      await tester.pumpWidget(MaterialApp(home: TwoLevelListDemo()));
+        await tester.pumpWidget(MaterialApp(theme: theme, home: TwoLevelListDemo()));
         await expectLater(tester, meetsGuideline(textContrastGuideline));
         handle.dispose();
       });
+    }
   });
 }