Rookian/DisposeSpec.cs

## DisposeSpec.cs
    public class UnitOfWork : IUnitOfWork
    {
        private ObjectContext _db;

        public UnitOfWork(ObjectContext db)
        {
            _db = db;
        }

        public void Commit()
        {
            _db.SaveChanges();
        }

        public void Dispose()
        {
            _db.Dispose();
            _db = null;
        }
    }

    [Subject(typeof(BaseForm<>))]
    public class When_disposing_form
    {
        static PosForm PosForm;
        static ObjectContext ObjectContext;
        private static IUnitOfWork UnitOfWork;
        private static IPosDeviceRepository PosDeviceRepository;
        Establish context = () =>
                                {
                                    ObjectContext = new ErsManagementEntities();
                                    UnitOfWork = A.Fake<UnitOfWork>(x => x.WithArgumentsForConstructor(
                                            () => new UnitOfWork(ObjectContext)));
                                    PosDeviceRepository = new PosDeviceRepository(ObjectContext);
                                };

        Because of = () =>
        {
            using (PosForm = new PosForm(null, null, null, null, UnitOfWork, PosDeviceRepository, null, null, null))
            {

            }
        };

        It should_dispose_object_context = () => A.CallTo(() => UnitOfWork.Dispose()).MustHaveHappened();
    }
	public class UnitOfWork : IUnitOfWork
	{
	private ObjectContext _db;

	public UnitOfWork(ObjectContext db)
	{
	_db = db;
	}

	public void Commit()
	{
	_db.SaveChanges();
	}

	public void Dispose()
	{
	_db.Dispose();
	_db = null;
	}
	}

	[Subject(typeof(BaseForm<>))]
	public class When_disposing_form
	{
	static PosForm PosForm;
	static ObjectContext ObjectContext;
	private static IUnitOfWork UnitOfWork;
	private static IPosDeviceRepository PosDeviceRepository;
	Establish context = () =>
	{
	ObjectContext = new ErsManagementEntities();
	UnitOfWork = A.Fake<UnitOfWork>(x => x.WithArgumentsForConstructor(
	() => new UnitOfWork(ObjectContext)));
	PosDeviceRepository = new PosDeviceRepository(ObjectContext);
	};

	Because of = () =>
	{
	using (PosForm = new PosForm(null, null, null, null, UnitOfWork, PosDeviceRepository, null, null, null))
	{

	}
	};

	It should_dispose_object_context = () => A.CallTo(() => UnitOfWork.Dispose()).MustHaveHappened();
	}