public void ExecuteBasicInstSize()
{
Machine machine = new Machine();
object nil = machine.UndefinedObjectClass;
Assert.IsNotNull(nil);
Assert.IsInstanceOfType(nil, typeof(IClass));
ModelParser parser = new ModelParser("^UndefinedObject new basicInstSize");
this.compiler.CompileExpression(parser.ParseExpression());
object result = this.block.Execute(machine, null);
Assert.AreEqual(0, result);
}