@Test
  public void testInterestListRegistration_ALL_KEYS() throws Exception {
    vm1.invoke(() -> InterestListDUnitTest
        .createClientCache(NetworkUtils.getServerHostName(vm0.getHost()), PORT1));
    vm2.invoke(() -> InterestListDUnitTest
        .createClientCache(NetworkUtils.getServerHostName(vm0.getHost()), PORT1));

    vm1.invoke(InterestListDUnitTest::createEntriesK1andK2);
    vm2.invoke(InterestListDUnitTest::createEntriesK1andK2);

    vm2.invoke(InterestListDUnitTest::registerALL_KEYS);

    vm1.invoke(InterestListDUnitTest::put_ALL_KEYS);
    Wait.pause(10000);
    vm2.invoke(InterestListDUnitTest::validate_ALL_KEYS);
  }
one server two clients create Entries in all the vms register ALL_KEYS and verifies that
updates are receiving to all the keys
geode-core/src/distributedTest/java/org/apache/geode/internal/cache/tier/sockets/InterestListDUnitTest.java