public static void ExtensionCollectionPublicMembersTest()
{
ExtensionCollection <IMyExtensibleObject> collection = new ExtensionCollection <IMyExtensibleObject>(new MyExtensibleObject(), "syncRoot");
collection.Add(new MyExtension1());
collection.Add(new MyExtension2());
Assert.True(collection.Count == 2, $"Expected the collection to contain 2 items, instead it contained '{collection.Count}' items.");
IMyExtension result = collection.Find <IMyExtension>();
Assert.NotNull(result);
Collection <IMyExtension> myCollection = collection.FindAll <IMyExtension>();
Assert.True(myCollection.Count == 2, $"Expected the collection to contain 2 items of type 'IMyExtension', instead it contained: '{myCollection.Count}' items.");
}