implement code review remarks

move test to PdfReaderTest

resolves DEVSIX-1426

Author: joris.schellekens

kernel/src/test/java/com/itextpdf/kernel/pdf/PdfReaderTest.java

@@ -46,6 +46,7 @@ This file is part of the iText (R) project.
 import com.itextpdf.io.source.ByteArrayOutputStream;
 import com.itextpdf.io.source.ByteUtils;
 import com.itextpdf.kernel.PdfException;
+import com.itextpdf.kernel.utils.CompareTool;
 import com.itextpdf.test.ExtendedITextTest;
 import com.itextpdf.test.annotations.LogMessage;
 import com.itextpdf.test.annotations.LogMessages;
@@ -1477,6 +1478,28 @@ public void freeReferencesTest() throws IOException {
         pdfDoc.close();
     }
 
+    @Test
+    public void freeReferencesTest02() throws IOException, InterruptedException {
+
+        String cmpFile = sourceFolder + "cmp_freeReferences02.pdf";
+        String outputFile = destinationFolder + "freeReferences02.pdf";
+        String inputFile = sourceFolder + "freeReferences02.pdf";
+
+        PdfWriter writer = new PdfWriter(outputFile);
+        PdfReader reader = new PdfReader(inputFile);
+
+        PdfDocument inputPdfDocument = new PdfDocument(reader);
+        PdfDocument outputPdfDocument = new PdfDocument(writer);
+
+        int lastPage = inputPdfDocument.getNumberOfPages();
+        inputPdfDocument.copyPagesTo(lastPage, lastPage, outputPdfDocument);
+
+        inputPdfDocument.close();
+        outputPdfDocument.close();
+
+        Assert.assertNull(new CompareTool().compareByContent(outputFile, cmpFile, destinationFolder, "diff_"));
+    }
+
     @Test
     public void pdfVersionTest() throws IOException {
         String filename = sourceFolder + "hello.pdf";