@Override
      public void afterHavingCompacted() {
        synchronized (region) {
          if (!rollingDone) {
            rollingDone = true;
          } else {
            fail("rollingDone was set before actually rolling");
          }
        }
      }
to validate the get operation performed on a byte array of length zero
geode-core/src/integrationTest/java/org/apache/geode/internal/cache/DiskRegRecoveryJUnitTest.java