public void AddElement_Valid() { PresentationDocument pres = PowerpointHelper.CreatePresentationWithOneEmptySlide("./testFile3.pptx"); ShapeTree shapeTree = PowerpointHelper.GetShapeTreeOfFirstSlide(pres); List <int[]> list = new List <int[]>(); list.Add(new int[] { 1, 2 }); list.Add(new int[] { 3, 4 }); list.Add(new int[] { 5, 6 }); Shape polygon = PowerpointHelper.CreatePolygon(list); PowerpointHelper.AddElement(shapeTree, polygon); var errors = validator.Validate(pres); Assert.IsTrue(errors.Count() == 0); Assert.IsTrue(shapeTree.Count() > 0); }