Add a couple unit tests

for test cases borrowed from OXPT fork sergey-tihon/Clippit.
The bugs driving these cases were fixed independently
(using quite different approaches in each fork) but I still
wanted to capture the test cases.

Author: Lowell Stewart

OpenXmlPowerTools.Tests/DocumentAssemblerTests.cs

@@ -208,6 +208,42 @@ public void DA102_Throws(string name, string data)
                 });
         }
 
+        [Fact]
+        public void DATemplateMaior()
+        {
+            // this test case was causing incorrect behavior of OpenXmlRegex when replacing fields in paragraphs that contained
+            // lastRenderedPageBreak XML elements. Recent fixes relating to UnicodeMapper and OpenXmlRegex addressed it.
+            string name = "DA-TemplateMaior.docx";
+            DA101(name, "DA-templateMaior.xml", false);
+            var assembledDocx = new FileInfo(Path.Combine(TestUtil.TempDir.FullName, name.Replace(".docx", "-processed-by-DocumentAssembler.docx")));
+            var afterAssembling = new WmlDocument(assembledDocx.FullName);
+
+            var descendants = afterAssembling.MainDocumentPart.Value;
+
+            Assert.False(descendants.Contains(">"), "Found > on text");
+        }
+
+        [Fact]
+        public void DAXmlError()
+        {
+            /* The assembly below would originally (prior to bug fixes) cause an exception to be thrown during assembly: 
+                 System.ArgumentException : '
', hexadecimal value 0x01, is an invalid character.
+             */
+            string name = "DA-xmlerror.docx";
+            string data = "DA-xmlerror.xml";
+
+            DirectoryInfo sourceDir = new DirectoryInfo("../../../../TestFiles/");
+            var templateDocx = new FileInfo(Path.Combine(sourceDir.FullName, name));
+            var dataFile = new FileInfo(Path.Combine(sourceDir.FullName, data));
+
+            var wmlTemplate = new WmlDocument(templateDocx.FullName);
+            var xmlData = XElement.Load(dataFile.FullName);
+
+            var afterAssembling = DocumentAssembler.AssembleDocument(wmlTemplate, xmlData, out var returnedTemplateError);
+            var assembledDocx = new FileInfo(Path.Combine(TestUtil.TempDir.FullName, templateDocx.Name.Replace(".docx", "-processed-by-DocumentAssembler.docx")));
+            afterAssembling.SaveAs(assembledDocx.FullName);
+        }
+
         [Theory]
         [InlineData("DA025-TemplateDocument.docx", "DA-Data.xml", false)]
         public void DA103_UseXmlDocument(string name, string data, bool err)