private DataOutput createDOS() {
    baos = new ByteArrayOutputStream(32);
    dos = new DataOutputStream(baos);
    return dos;
  }
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