MaterialTestWidget constructor
      const
      MaterialTestWidget({ 
    
    
- Key? key,
- required Widget child,
- TargetPlatform? platform,
- ThemeMode? themeMode = ThemeMode.dark,
- Iterable<LocalizationsDelegate> ? localizationsDelegates,
- ThemeData? lightTheme,
- ThemeData? darkTheme,
Implementation
const MaterialTestWidget(
    {super.key,
    required this.child,
    this.platform,
    this.themeMode = ThemeMode.dark,
    this.localizationsDelegates,
    this.lightTheme,
    this.darkTheme});