Add tests for issue-177

Author: VahidN

src/iTextSharp.LGPLv2.Core.FunctionalTests/Issues/Issue177.cs

@@ -0,0 +1,40 @@
+using System.IO;
+using iTextSharp.text.pdf;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+
+namespace iTextSharp.LGPLv2.Core.FunctionalTests.Issues;
+
+/// <summary>
+///     https://github.com/VahidN/iTextSharp.LGPLv2.Core/issues/177
+/// </summary>
+[TestClass]
+public class Issue177
+{
+    [TestMethod]
+    public void Test_Issue177_Verify_PdfReader_Works()
+    {
+        var inputFile = TestUtils.GetPdfsPath(fileName: "issue177.pdf");
+
+        using var reader = new PdfReader(inputFile);
+        Assert.AreEqual(expected: 1, reader.NumberOfPages);
+    }
+
+    [TestMethod]
+    public void Test_Issue177_Verify_PdfStamper_Works()
+    {
+        var inputFile = TestUtils.GetPdfsPath(fileName: "issue177.pdf");
+        using var outStream = new FileStream(TestUtils.GetOutputFileName(), FileMode.Create);
+        PdfReader.AllowOpenWithFullPermissions = true;
+        using var pdfReader = new PdfReader(inputFile);
+        using var pdfStamper = new PdfStamper(pdfReader, outStream);
+
+        var box = pdfReader.GetPageSize(index: 1);
+        var canvas = pdfStamper.GetOverContent(pageNum: 1);
+        canvas.SetRgbColorStroke(red: 255, green: 0, blue: 0);
+        canvas.MoveTo(box.Left, box.Bottom);
+        canvas.LineTo(box.Right, box.Top);
+        canvas.MoveTo(box.Right, box.Bottom);
+        canvas.LineTo(box.Left, box.Top);
+        canvas.Stroke();
+    }
+}