private void faultInFromOldOplog() {
    put100Int();
    putTillOverFlow(region);
    region.put(200, 200);
    region.put(201, 201);
    region.forceRolling();
    if (!(region.get(2).equals(2))) {
      fail(" fault in value not correct");
    }
  }
fault in a value from an old oplog
geode-core/src/integrationTest/java/org/apache/geode/internal/cache/FaultingInJUnitTest.java