在私有方法中调用的模拟数据库对象

我已经开始接触模拟框架，因为我想为（间接）向数据库写入某些内容的方法编写一些单元测试。下面是类结构的一个小示例：

class SomePersistenceClass
{
    public void Persist(object value, string type)
    {
        if (type.Equals("Numeric"))
        {
            PersistNumeric( (int)value );
        }
    }
    private void PersistNumeric(int number)
    {
        //Some Calculations and Creation of DBObject
        number++;
        var dbObject = new DatabaseObject {DbObjectData = new DatabaseObjectData {Number = number, Creator = "John Doe"}};
        PersistImpl(dbObject);
    }
    private void PersistImpl(IDatabaseObject dbObject)
    {
        try
        {
            dbObject.Save();
        }
        catch (Exception)
        {
            //ErrorHandling
            throw;
        }
    }
}
interface IDatabaseObject
{
    DatabaseObjectData DbObjectData { get; set; }
    void Save();
}
class DatabaseObject : IDatabaseObject
{
    public DatabaseObjectData DbObjectData { get; set; }
    public void Save()
    {
        //Save to Database;
    }
}
class DatabaseObjectData
{
    public int Number { get; set; }
    public string Text { get; set; }
    public string Creator { get; set; }
}

我现在想做的是测试公共持久方法。这里的问题是，我的数据库对象将数据保存到数据库中。模拟 DatabaseObject 的 save 方法很容易，但我不确定将模拟对象注入 PersistImpl 方法的最佳方法是什么（如您所见，我对公共方法中的 DatabaseObject 一无所知）。其中一个方法是将数据库对象创建拉到公共方法中。所以像这样：

    public void Persist(object value, string type, IDatabaseObject dbObject)
    {
        if (type.Equals("Numeric"))
        {
            PersistNumeric( (int)value, dbObject );
        }
    }
    private void PersistNumeric(int number, IDatabaseObject dbObject)
    {
        //Some Calculations and Creation of DBObject
        number++;
        dbObject.DbObjectData.Number = number;
        dbObject.DbObjectData.Creator = "John Doe";
        PersistImpl(dbObject);
    }

但我对这种灵魂很不满意。我需要在持久性类之外创建数据库对象。

有没有解决此类问题的好方法？我肯定必须在我的单元测试中删除数据库访问权限。

interface IDatabaseObjectFactory
{
    IDatabaseObject Create(DatabaseObjectData data);
}
class DatabaseObjectFactory : IDatabaseObjectFactory
{
    public IDatabaseObject Create(DatabaseObjectData data)
    {
        return new DatabaseObject {DbObjectData = data };
    }
}
class SomePersistenceClass
{
    readonly IDatabaseObjectFactory _factory;
    public SomePersistenceClass()
    {
        _factory = new DatabaseObjectFactory();
    }
    public SomePersistenceClass(IDatabaseObjectFactory factory)
    {
        _factory = factory;
    }
    public void Persist(object value, string type) { /* ... */ }
    private void PersistImpl(IDatabaseObject dbObject) { /* ... */ }
    private void PersistNumeric(int number)
    {
        //Some Calculations and Creation of DBObject
        number++;
        var dbObject = _factory.Create(new DatabaseObjectData {Number = number, Creator = "John Doe"});
        PersistImpl(dbObject);
    }
}