private void checkEntries(Region r, int start, int end, String value) {
    LocalRegion region = (LocalRegion) r;
    for (int i = start; i < end; i++) {
      assertEquals(value, region.get(i));
    }
  }
Validate that values are, or are not, in memory
geode-core/src/integrationTest/java/org/apache/geode/internal/cache/DiskRegionAsyncRecoveryJUnitTest.java