drift/moor/test/data_class_test.dart

import 'package:moor/moor.dart';
import 'package:test/test.dart';

import 'data/tables/todos.dart';

void main() {
  test('data classes can be serialized', () {
    final entry = TodoEntry(
      id: 13,
      title: 'Title',
      content: 'Content',
      targetDate: DateTime.now(),
    );

    final serialized = entry.toJsonString();
    final deserialized = TodoEntry.fromJsonString(serialized);

    expect(deserialized, equals(deserialized));
  });

  test('default serializer can be overridden globally', () {
    final old = moorRuntimeOptions.defaultSerializer;
    moorRuntimeOptions.defaultSerializer = _MySerializer();

    final entry = TodoEntry(
      id: 13,
      title: 'Title',
      content: 'Content',
      category: 3,
      targetDate: DateTime.now(),
    );
    expect(
      entry.toJson(),
      {
        'id': 'foo',
        'title': 'foo',
        'content': 'foo',
        'category': 'foo',
        'target_date': 'foo',
      },
    );

    moorRuntimeOptions.defaultSerializer = old;
  });
}

class _MySerializer extends ValueSerializer {
  @override
  T fromJson<T>(dynamic json) {
    throw StateError('Should not be called');
  }

  @override
  dynamic toJson<T>(T value) {
    return 'foo';
  }
}