Add PdfReaderCustomFilterTest#encryptedDocumentCustomFilterStandartTest

DEVSIX-4188, DEVSIX-1918

Autoported commit.
Original commit hash: [9dfe9d764]

Author: Kate Ivanova

itext.tests/itext.kernel.tests/itext/kernel/crypto/PdfReaderCustomFilterTest.cs

@@ -0,0 +1,22 @@
+using System;
+using iText.IO.Util;
+using iText.Kernel.Crypto.Securityhandler;
+using iText.Kernel.Pdf;
+using iText.Test;
+
+namespace iText.Kernel.Crypto {
+    public class PdfReaderCustomFilterTest : ExtendedITextTest {
+        public static readonly String sourceFolder = iText.Test.TestUtil.GetParentProjectDirectory(NUnit.Framework.TestContext
+            .CurrentContext.TestDirectory) + "/resources/itext/kernel/crypto/PdfReaderCustomFilterTest/";
+
+        [NUnit.Framework.Test]
+        public virtual void EncryptedDocumentCustomFilterStandartTest() {
+            NUnit.Framework.Assert.That(() =>  {
+                PdfDocument doc = new PdfDocument(new PdfReader(sourceFolder + "customSecurityHandler.pdf"));
+                doc.Close();
+            }
+            , NUnit.Framework.Throws.InstanceOf<UnsupportedSecurityHandlerException>().With.Message.EqualTo(MessageFormatUtil.Format(UnsupportedSecurityHandlerException.UnsupportedSecurityHandler, "/Standart")))
+;
+        }
+    }
+}

itext.tests/itext.kernel.tests/resources/itext/kernel/crypto/PdfReaderCustomFilterTest/customSecurityHandler.pdf

@@ -1 +1 @@
-4a3af4d17de948b14c25f2f547aab34742a14a58
+9dfe9d764e141f04c6a0663f4d3a1f960e3f8c09