@Override
  public final void postTearDownCacheTestCase() throws Exception {
    // close the clients first
    closeForceInvalidateCache();
    // then close the servers
    server1.invoke(ClientServerForceInvalidateDUnitTest::closeForceInvalidateCache);
    server2.invoke(ClientServerForceInvalidateDUnitTest::closeForceInvalidateCache);
  }
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