Unit Testing Db4oTool Instrumentation (Collections)

Question

I am using the db4oTool to instrument my classes for transparent activation/persistence. I am using the -ta and -collections switches.

I know how to check that the classes themselves are being properly instrumented by the following test.

Assert.IsTrue(typeof(IActivatable).IsAssignableFrom(typeof(Machine)), "Machine class not instrumented");

Reference: http://community.versant.com/Documentation/Reference/db4o-8.0/net35/reference/Content/basics/transparentpersistence/ta_enhanced_example.htm

However I do not know how to check that my collections are being instrumented correctly.

Given the following machine class:

public class Machine : DomainBase
    {
        private string _machineId;

        public string MachineId
        {
            get { return _machineId; }
            set { _machineId = value; }
        }


        public IList<EnergyTag> EnergyTags { get; set; }

        public void AddEnergyTag(EnergyTag energyTag)
        {
            if (energyTag.Machine == null)
                energyTag.Machine = this;
            if (EnergyTags == null)
                EnergyTags = new List<EnergyTag>();
            EnergyTags.Add(energyTag);
        }

    }

How would I test that the EnergyTags collection was properly instrumented?

Edit:

Solution:

var machine = new Machine();                                                        
Assert.IsTrue(machine.EnergyTags.GetType().Equals(typeof(ActivatableList<EnergyTag>)));

Answer 1

You can check the concrete type of EnergyTags:

using System.Collections.Generic;

public class Item
{
    private IList<Item> l = new List<Item>();

    public IList<Item> Items
    {
        get { return l; }

        set { l = value; }
    }

    public static void Main()
    {
        System.Console.WriteLine("Type: {0}", new Item().Items.GetType().FullName);
    }   
}

Will output something like:

Type: Db4objects.Db4o.Collections.ActivatableList`1[[Item, ActivatableCollections, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null]]

So you can either check by name (if you don't have a reference to db4o assemblies in your model) or by type otherwise.

Keep in mind that this name (ActivatableList) is an implementation detail and may change in future db4o releases.

Best