fix(sigblock): invalid preview in case of sig-blocks with more than half page height

Issue: #68

## Info:
This is only a work-around, because it looks like a general issue in methods to create visual signature tables.
T

1 files changed, 10 insertions, 6 deletions

diff --git a/pdf-as-pdfbox-2/src/test/java/at/gv/egiz/pdfas/lib/testpdfbox/SignatureFieldsAndPlaceHolderExtractorTest.java b/pdf-as-pdfbox-2/src/test/java/at/gv/egiz/pdfas/lib/testpdfbox/SignatureFieldsAndPlaceHolderExtractorTest.java
index 0d85c82b..40522504 100644
--- a/pdf-as-pdfbox-2/src/test/java/at/gv/egiz/pdfas/lib/testpdfbox/SignatureFieldsAndPlaceHolderExtractorTest.java
+++ b/pdf-as-pdfbox-2/src/test/java/at/gv/egiz/pdfas/lib/testpdfbox/SignatureFieldsAndPlaceHolderExtractorTest.java
@@ -1,16 +1,20 @@
 package at.gv.egiz.pdfas.lib.testpdfbox;
 
-import at.gv.egiz.pdfas.lib.impl.pdfbox2.placeholder.SignatureFieldsAndPlaceHolderExtractor;
-import at.gv.egiz.pdfas.lib.impl.placeholder.SignaturePlaceholderData;
-import org.apache.pdfbox.pdmodel.PDDocument;
-import org.junit.Assert;
-import org.junit.Test;
-
 import java.io.File;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
 
+import org.apache.pdfbox.pdmodel.PDDocument;
+import org.junit.Assert;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
+
+import at.gv.egiz.pdfas.lib.impl.pdfbox2.placeholder.SignatureFieldsAndPlaceHolderExtractor;
+import at.gv.egiz.pdfas.lib.impl.placeholder.SignaturePlaceholderData;
+
+@RunWith(JUnit4.class)
 public class SignatureFieldsAndPlaceHolderExtractorTest {
 
   public String getPath(String resourceName) {