diff --git a/src/test/java/org/apache/commons/codec/binary/Base64TestData.java b/src/test/java/org/apache/commons/codec/binary/Base64TestData.java
index 05facdb15c..ebca757f9f 100644
--- a/src/test/java/org/apache/commons/codec/binary/Base64TestData.java
+++ b/src/test/java/org/apache/commons/codec/binary/Base64TestData.java
@@ -23,22 +23,35 @@
  *
  * @see <a href="http://www.ietf.org/rfc/rfc2045.txt">RFC 2045</a>
  */
-public class Base64TestData {
+class Base64TestData {
 
     /**
      * A valid base 64 encoding that has a length that is a multiple of 3.
-     * @see <a href="https://issues.apache.org/jira/browse/CODEC-101">Codec 101</a>
+     *
+     * @see <a href="https://issues.apache.org/jira/browse/CODEC-101">CODEC-101</a>
      */
-    public static final String CODEC_101_INPUT_LENGTH_IS_MULTIPLE_OF_3 = "124";
+    static final String CODEC_101_INPUT_LENGTH_IS_MULTIPLE_OF_3 = "124";
 
-    public static final String CODEC_98_NPE =
+    /**
+     * See CODEC-98.
+     *
+     * @see <a href="https://issues.apache.org/jira/browse/CODEC-98">CODEC-98</a>
+     */
+    static final String CODEC_98_NPE =
         "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXpBQkNERUZHSElKS0xNTk9QUVJTVFVWV1hZWjAxMjM";
 
-    public static final String CODEC_98_NPE_DECODED =
+    /**
+     * See CODEC-98.
+     *
+     * @see <a href="https://issues.apache.org/jira/browse/CODEC-98">CODEC-98</a>
+     */
+    static final String CODEC_98_NPE_DECODED =
         "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123";
 
-    // OpenSSL doesn't include the final \n, but it would be annoying beyond belief
-    // to further parameterize commons-codec to support this pointless variation.
+    /**
+     * OpenSSL doesn't include the final \n, but it would be annoying beyond belief
+     * to further parameterize commons-codec to support this pointless variation.
+     */
     static final String ENCODED_64_CHARS_PER_LINE =
         "9IPNKwUvdLiIAp6ctz12SiQmOGstWyYvSPeevufDhrzaws65voykKjbIj33YWTa9\n" +
         "xA7c/FHypWclrZhQ7onfc3JE93BJ5fT4R9zAEdjbjy1hv4ZYNnET4WJeXMLJ/5p+\n" +