@Test
  public void testRegisterCreatesInvalidEntry() {
    // First create entries on both servers via the two client
    client1.invoke(RegisterInterestKeysDUnitTest::createEntriesK1);
    client2.invoke(RegisterInterestKeysDUnitTest::registerKeysK1);
  }
This tests whether the updates are received by other clients or not , if there are situation of
Interest List fail over
geode-core/src/distributedTest/java/org/apache/geode/internal/cache/tier/sockets/RegisterInterestKeysDUnitTest.java