public static void putCleanDelta(Integer keys, Long updates) {
    Region r = cache.getRegion(REGION_NAME);

    for (int i = 0; i < keys; i++) {
      r.create(DELTA_KEY + i, new DeltaTestImpl());
    }

    for (int i = 0; i < keys; i++) {
      for (long j = 0; j < updates; j++) {
        DeltaTestImpl delta = new DeltaTestImpl();
        if (j % 3 == 1) {
          delta.setIntVar(10);
        } else if (j % 3 == 2) {
          delta.setStr("two");
        } else {
          delta.setByteArr(new byte[] {11, 22, 33, 44});
          delta.setDoubleVar(5.7);
        }
        r.put(DELTA_KEY + i, delta);
      }
    }
  }
Simulates old value null, entry null
geode-core/src/distributedTest/java/org/apache/geode/internal/cache/DeltaPropagationStatsDUnitTest.java