public void TestSorting_SlideOrder()
        {
            string TEST_PPT = TESTFILE_DIR + "test002.pptx";
            try
            {
                using (PptxDocumentProcessor pdp = new PptxDocumentProcessor(File.Open(TEST_PPT, FileMode.Open)))
                {
                    using (pdp.Output = File.Open(TEST_OUTPUT_FILE, FileMode.CreateNew))
                    {
                        pdp.Process(DocumentProcessingActions.PassThrough);
                    }
                    PptxPresentationPartFilter ppf = pdp.GetPresentationPartFilter() as PptxPresentationPartFilter;
                    Assert.IsNotNull(ppf);
                    List<PartInfo> srpl = ppf.SortedRelatedParts;
                    Assert.AreEqual(9, srpl.Count, "Different number of related parts");

                    PartInfo pi = srpl[0];
                    Assert.AreEqual("rId2", pi.Id);
                    Assert.AreEqual("slides/slide1.xml", pi.Target);
                    pi = srpl[1];
                    Assert.AreEqual("rId3", pi.Id);
                    Assert.AreEqual("slides/slide2.xml", pi.Target);
                    pi = srpl[2];
                    Assert.AreEqual("rId4", pi.Id);
                    Assert.AreEqual("slides/slide3.xml", pi.Target);
                    pi = srpl[3];
                    Assert.AreEqual("rId8", pi.Id);
                    Assert.AreEqual("theme/theme1.xml", pi.Target);
                    pi = srpl[4];
                    Assert.AreEqual("rId7", pi.Id);
                    Assert.AreEqual("viewProps.xml", pi.Target);
                    pi = srpl[5];
                    Assert.AreEqual("rId1", pi.Id);
                    Assert.AreEqual("slideMasters/slideMaster1.xml", pi.Target);
                    pi = srpl[6];
                    Assert.AreEqual("rId6", pi.Id);
                    Assert.AreEqual("presProps.xml", pi.Target);
                    pi = srpl[7];
                    Assert.AreEqual("rId5", pi.Id);
                    Assert.AreEqual("notesMasters/notesMaster1.xml", pi.Target);
                    pi = srpl[8];
                    Assert.AreEqual("rId9", pi.Id);
                    Assert.AreEqual("tableStyles.xml", pi.Target);
                }
            }
            finally
            {
                File.Delete(TEST_OUTPUT_FILE);
            }
       }
        public void TestGetSlideRelIdFromPosition()
        {
            string TEST_PPT = TESTFILE_DIR + "test002.pptx";
            try
            {
                using (PptxDocumentProcessor pdp = new PptxDocumentProcessor(File.Open(TEST_PPT, FileMode.Open)))
                {
                    using (pdp.Output = File.Open(TEST_OUTPUT_FILE, FileMode.CreateNew))
                    {
                        pdp.Process(DocumentProcessingActions.PassThrough);
                    }
                    PptxPresentationPartFilter ppf = pdp.GetPresentationPartFilter() as PptxPresentationPartFilter;
                    Assert.IsNotNull(ppf);

                    Assert.AreEqual(string.Empty, ppf.GetSlideRelIdFromPosition(0));
                    Assert.AreEqual("rId2", ppf.GetSlideRelIdFromPosition(1));
                    Assert.AreEqual("rId3", ppf.GetSlideRelIdFromPosition(2));
                    Assert.AreEqual("rId4", ppf.GetSlideRelIdFromPosition(3));
                    Assert.AreEqual(string.Empty, ppf.GetSlideRelIdFromPosition(4));
                }
            }
            finally
            {
                File.Delete(TEST_OUTPUT_FILE);
            }
        }