Clean up SnackBar inherit theme data test (flutter#154921)

Fixes [Verbose `SnackBar` inherit theme data test](flutter#154920)

Author: TahaTesser

packages/flutter/test/material/snack_bar_test.dart

@@ -596,90 +596,13 @@ void main() {
     expect(buttonTextStyle.color, equals(darkTheme.colorScheme.inversePrimary));
   });
 
-  testWidgets('SnackBar should inherit theme data from its ancestor.', (WidgetTester tester) async {
-    final SliderThemeData sliderTheme = SliderThemeData.fromPrimaryColors(
-      primaryColor: Colors.black,
-      primaryColorDark: Colors.black,
-      primaryColorLight: Colors.black,
-      valueIndicatorTextStyle: const TextStyle(color: Colors.black),
-    );
-
-    final ChipThemeData chipTheme = ChipThemeData.fromDefaults(
-      primaryColor: Colors.black,
-      secondaryColor: Colors.white,
-      labelStyle: const TextStyle(color: Colors.black),
-    );
-
-    const PageTransitionsTheme pageTransitionTheme = PageTransitionsTheme(
-      builders: <TargetPlatform, PageTransitionsBuilder>{
-        TargetPlatform.iOS: CupertinoPageTransitionsBuilder(),
-        TargetPlatform.macOS: CupertinoPageTransitionsBuilder(),
-      },
-    );
-
-    final ThemeData theme = ThemeData.light().copyWith(
-      visualDensity: VisualDensity.standard,
-      primaryColor: Colors.black,
-      primaryColorLight: Colors.black,
-      primaryColorDark: Colors.black,
-      canvasColor: Colors.black,
-      shadowColor: Colors.black,
-      scaffoldBackgroundColor: Colors.black,
-      cardColor: Colors.black,
-      dividerColor: Colors.black,
-      focusColor: Colors.black,
-      hoverColor: Colors.black,
-      highlightColor: Colors.black,
-      splashColor: Colors.black,
-      splashFactory: InkRipple.splashFactory,
-      unselectedWidgetColor: Colors.black,
-      disabledColor: Colors.black,
-      buttonTheme: const ButtonThemeData(colorScheme: ColorScheme.dark()),
-      toggleButtonsTheme: const ToggleButtonsThemeData(textStyle: TextStyle(color: Colors.black)),
-      secondaryHeaderColor: Colors.black,
-      dialogBackgroundColor: Colors.black,
-      indicatorColor: Colors.black,
-      hintColor: Colors.black,
-      textTheme: ThemeData.dark().textTheme,
-      primaryTextTheme: ThemeData.dark().textTheme,
-      inputDecorationTheme: ThemeData.dark().inputDecorationTheme.copyWith(border: const OutlineInputBorder()),
-      iconTheme: ThemeData.dark().iconTheme,
-      primaryIconTheme: ThemeData.dark().iconTheme,
-      sliderTheme: sliderTheme,
-      tabBarTheme: const TabBarTheme(labelColor: Colors.black),
-      tooltipTheme: const TooltipThemeData(height: 100),
-      cardTheme: const CardTheme(color: Colors.black),
-      chipTheme: chipTheme,
-      platform: TargetPlatform.iOS,
-      materialTapTargetSize: MaterialTapTargetSize.shrinkWrap,
-      applyElevationOverlayColor: false,
-      pageTransitionsTheme: pageTransitionTheme,
-      appBarTheme: const AppBarTheme(backgroundColor: Colors.black),
-      scrollbarTheme: const ScrollbarThemeData(radius: Radius.circular(10.0)),
-      bottomAppBarTheme: const BottomAppBarTheme(color: Colors.black),
-      colorScheme: const ColorScheme.light(),
-      dialogTheme: const DialogTheme(backgroundColor: Colors.black),
-      floatingActionButtonTheme: const FloatingActionButtonThemeData(backgroundColor: Colors.black),
-      navigationRailTheme: const NavigationRailThemeData(backgroundColor: Colors.black),
-      typography: Typography.material2018(),
-      snackBarTheme: const SnackBarThemeData(backgroundColor: Colors.black),
-      bottomSheetTheme: const BottomSheetThemeData(backgroundColor: Colors.black),
-      popupMenuTheme: const PopupMenuThemeData(color: Colors.black),
-      bannerTheme: const MaterialBannerThemeData(backgroundColor: Colors.black),
-      dividerTheme: const DividerThemeData(color: Colors.black),
-      bottomNavigationBarTheme: const BottomNavigationBarThemeData(type: BottomNavigationBarType.fixed),
-      timePickerTheme: const TimePickerThemeData(backgroundColor: Colors.black),
-      textButtonTheme: TextButtonThemeData(style: TextButton.styleFrom(foregroundColor: Colors.red)),
-      elevatedButtonTheme: ElevatedButtonThemeData(style: ElevatedButton.styleFrom(backgroundColor: Colors.green)),
-      outlinedButtonTheme: OutlinedButtonThemeData(style: OutlinedButton.styleFrom(foregroundColor: Colors.blue)),
-      textSelectionTheme: const TextSelectionThemeData(cursorColor: Colors.black),
-      dataTableTheme: const DataTableThemeData(),
-      checkboxTheme: const CheckboxThemeData(),
-      radioTheme: const RadioThemeData(),
-      switchTheme: const SwitchThemeData(),
-      progressIndicatorTheme: const ProgressIndicatorThemeData(),
+  testWidgets('SnackBar should inherit theme data from its ancestor', (WidgetTester tester) async {
+    final ThemeData theme = ThemeData(
+      colorScheme: ColorScheme.fromSeed(
+        seedColor: Colors.green,
+        brightness: Brightness.dark,
+      ),
     );
-
     ThemeData? themeBeforeSnackBar;
     ThemeData? themeAfterSnackBar;
     await tester.pumpWidget(
@@ -722,7 +645,6 @@ void main() {
     final ThemeData comparedTheme = themeBeforeSnackBar!.copyWith(
       colorScheme: themeAfterSnackBar!.colorScheme,
     ); // Fields replaced by SnackBar.
-
     expect(comparedTheme, themeAfterSnackBar);
   });