Extend some iTextCore test classes

DEVSIX-3360

Author: Kate Ivanova

sign/src/test/java/com/itextpdf/signatures/CertificateSupportedCriticalExtensionsTest.java

@@ -43,6 +43,7 @@ This file is part of the iText (R) project.
 package com.itextpdf.signatures;
 
 import com.itextpdf.signatures.testutils.X509MockCertificate;
+import com.itextpdf.test.ExtendedITextTest;
 import com.itextpdf.test.annotations.type.UnitTest;
 
 import java.security.Security;
@@ -56,7 +57,7 @@ This file is part of the iText (R) project.
 import org.junit.rules.ExpectedException;
 
 @Category(UnitTest.class)
-public class CertificateSupportedCriticalExtensionsTest {
+public class CertificateSupportedCriticalExtensionsTest extends ExtendedITextTest {
 
     @BeforeClass
     public static void beforeClass() {

sign/src/test/java/com/itextpdf/signatures/sign/CrlClientOnlineTest.java

@@ -43,6 +43,7 @@ This file is part of the iText (R) project.
 package com.itextpdf.signatures.sign;
 
 import com.itextpdf.signatures.CrlClientOnline;
+import com.itextpdf.test.ExtendedITextTest;
 import com.itextpdf.test.annotations.type.UnitTest;
 import org.junit.Assert;
 import org.junit.Test;
@@ -52,7 +53,7 @@ This file is part of the iText (R) project.
 import java.net.URL;
 
 @Category(UnitTest.class)
-public class CrlClientOnlineTest {
+public class CrlClientOnlineTest extends ExtendedITextTest {
 
     private static final String destinationFolder = "./target/test/com/itextpdf/signatures/sign/";