private void validateServerMetaDataKnowsWhichClientRegionIsEmpty() {
    CacheClientProxy proxy = getClientProxy();
    assertThat(proxy.getRegionsWithEmptyDataPolicy()).containsKey(SEPARATOR + PROXY_REGION_NAME);
    assertThat(proxy.getRegionsWithEmptyDataPolicy())
        .doesNotContainKey(SEPARATOR + CACHING_PROXY_REGION_NAME);
    assertThat(proxy.getRegionsWithEmptyDataPolicy()).hasSize(1);
    assertThat(proxy.getRegionsWithEmptyDataPolicy()).containsEntry(SEPARATOR + PROXY_REGION_NAME,
        0);
  }
Register list of keys on given region
geode-core/src/distributedTest/java/org/apache/geode/internal/cache/tier/sockets/RegisterInterestServerMetaDataDistributedTest.java