added a test where the encoded input string has the padding char in the middle; contrary to commons-codec, it doesn't halt and continues translating

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/fileupload/trunk@1458266 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/src/test/java/org/apache/commons/fileupload/util/mime/Base64DecoderTestCase.java b/src/test/java/org/apache/commons/fileupload/util/mime/Base64DecoderTestCase.java
index 68eff8e..5f95228 100644
--- a/src/test/java/org/apache/commons/fileupload/util/mime/Base64DecoderTestCase.java
+++ b/src/test/java/org/apache/commons/fileupload/util/mime/Base64DecoderTestCase.java
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