private byte[] convertValueToByteArray(Object value) {
    return ByteBuffer.allocate(Long.SIZE / Byte.SIZE).putLong((Long) value).array();
  }
Extracted from JUnit setUp() to reduce test overhead for cases where offheap memory isn't
needed.
geode-core/src/test/java/org/apache/geode/internal/offheap/OffHeapHelperJUnitTest.java