add test coverage for invalid document from #33

src/UglyToad.PdfPig.Tests/Integration/IntegrationHelpers.cs

@@ -16,5 +16,17 @@
 
             return Path.Combine(documentFolder, name);
         }
+
+        public static string GetSpecificTestDocumentPath(string name, bool isPdf = true)
+        {
+            var documentFolder = Path.GetFullPath(Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "..", "..", "..", "Integration", "SpecificTestDocuments"));
+
+            if (!name.EndsWith(".pdf") && isPdf)
+            {
+                name += ".pdf";
+            }
+
+            return Path.Combine(documentFolder, name);
+        }
     }
 }

src/UglyToad.PdfPig.Tests/Integration/InvalidObjectLoopTests.cs

@@ -0,0 +1,23 @@
+namespace UglyToad.PdfPig.Tests.Integration
+{
+    using Xunit;
+
+    public class InvalidObjectLoopTests
+    {
+        [Fact]
+        public void CanOpenDocumentAndGetPage()
+        {
+            var path = IntegrationHelpers.GetSpecificTestDocumentPath("invalid-xref-loop.pdf");
+
+            using (var document = PdfDocument.Open(path))
+            {
+                for (var i = 1; i <= document.NumberOfPages; i++)
+                {
+                    var page = document.GetPage(i);
+
+                    Assert.NotNull(page.Content);
+                }
+            }
+        }
+    }
+}