@Before
  public void setUp() {
    System.setProperty(ClientHealthMonitor.CLIENT_HEALTH_MONITOR_INTERVAL_PROPERTY,
        Integer.toString(monitorIntervalMillis));

    mockCache = mock(InternalCache.class);
    mockStats = mock(CacheClientNotifierStats.class);
    clientHealthMonitor = ClientHealthMonitor.getInstance(mockCache, pingIntervalMillis, mockStats);
  }
This is a functional-test for <code>ClientHealthMonitor</code>.
geode-core/src/test/java/org/apache/geode/internal/cache/tier/sockets/ClientHealthMonitorTest.java