private void validateServerListenerInvoked() {
    boolean listenerInvoked =
        server1.invoke(ClientServerForceInvalidateDUnitTest::validateOnServer) || server2.invoke(
            ClientServerForceInvalidateDUnitTest::validateOnServer);
    assertTrue(listenerInvoked);
  }
1. Invalidate a non-existent entry from the server. 2. Validate that the servers see after
invalidate. 3. Validate that the subscribed client invokes after invalidate.
geode-core/src/distributedTest/java/org/apache/geode/internal/cache/tier/sockets/ClientServerForceInvalidateDUnitTest.java