private DataInput createDIS() throws IOException {
    dos.close();
    ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray());
    return new DataInputStream(bais);
  }
Test for the new variable length format

TODO these tests need some work. I don't think they really represent edge cases for this variable
length value.
geode-core/src/test/java/org/apache/geode/internal/cache/VLJUnitTest.java