test ffigen timezone

test_timezone.dart

test('timezones', () {
  final pubspecFile = File('pubspec.yaml');
  final pubspecYaml = loadYaml(pubspecFile.readAsStringSync()) as YamlMap;
  final config = Config.fromYaml(pubspecYaml['ffigen'] as YamlMap);
  final output = parse(config).generate();
expect(output, contains('class TimeZoneLibrary{'));
  expect(output, contains('class NSString extends _ObjCWrapper {'));
  expect(output, contains('static NSTimeZone? getLocalTimeZone('));
 );
}