public void CreateFork_throws( [Values] ItemType itemType, [Values("OLD", null, "", " ")] string oldName, [Values("new", null, "", " ")] string newName ) { if (string.IsNullOrWhiteSpace(oldName) || string.IsNullOrWhiteSpace(newName)) { Assert.That(() => _commands.CreateFork( itemType, oldName, newName ), Throws.ArgumentException); } }