test('Normal ObjectModelWriter with do not includeIfNull', () {
      final model = ObjectModel(
        name: 'Person',
        path: 'path_to_my_model',
        baseDirectory: 'base_dir',
        generateForGenerics: false,
        staticCreate: false,
        fields: [
          Field(
            name: 'gender',
            type: ObjectType('Gender'),
            isRequired: true,
            ignore: false,
            includeIfNull: true,
            nonFinal: false,
            unknownEnumValue: 'X',
            ignoreEquality: false,
          ),
        ],
        converters: [],
      );
      WriterTestHelper.testObjectModelWriter(model, [], 'unknown-enum-value');
    });