@Before
  public void setUp() throws Exception {
    mapWithTwoEntries = new HashMap<>();
    mapWithTwoEntries.put("FOO", "foo");
    mapWithTwoEntries.put("BAR", 7);

    HeapDataOutputStream hdos = createHeapDataOutputStream();
    DataSerializer.writeObject(new ClassNotFoundSerialization(), hdos);
    bytesOfClassNotFoundSerialization = hdos.toByteArray();

    hdos = createHeapDataOutputStream();
    DataSerializer.writeObject(mapWithTwoEntries, hdos);
    bytesOfMap = hdos.toByteArray();

    bytesOfNull = serializeToBlob(null);

    zeroBytes = new byte[0];
  }
Unit Tests for {@link BlobHelper}.

TODO: add coverage for additional methods:
<li>{@link BlobHelper#deserializeBlob(byte[], KnownVersion, ByteArrayDataInput)}
<li>{@link BlobHelper#deserializeBuffer(ByteArrayDataInput, int)}
<li>{@link BlobHelper#deserializeOffHeapBlob(StoredObject)}
<li>{@link BlobHelper#serializeToBlob(Object, KnownVersion)}
geode-core/src/test/java/org/apache/geode/internal/util/BlobHelperTest.java