InjectedClassWithDependency.cs

namespace MyProjectNamespace
{
	public interface IInjectedClass
	{
		int TestMethod();
	}

	public class InjectedClass : IInjectedClass
	{
		private readonly IInjectedClassDependency _classDependency;

		public InjectedClass()
		{
			_classDependency =
				Sitecore.Configuration.Factory.CreateObject("guide/InjectedClassDependency", true) as InjectedClassDependency;
		}

		public int TestMethod()
		{
			return 16;
		}
	}
}