public virtual void Init_CheckPrivateMemberEquality()
{
#region data
var idx = new BinaryTreeIndex();
#endregion
#region
// init the index with some propertyIDs
var definedPropertyIDs = new List<Int64>() { 0L, 1L };
idx.Init(definedPropertyIDs);
// use some reflection action to get the private member of the index instance
var indexedPropertyIDs = (List<Int64>)idx.GetType().GetField("_PropertyIDs", BindingFlags.NonPublic | BindingFlags.Instance).GetValue(idx);
CollectionAssert.AreEqual(definedPropertyIDs, indexedPropertyIDs, "indexed propertyIDs do not match");
#endregion
}