@Test
  public void monitorIntervalDefaultsWhenInvalidValue() {
    String monitorInterval = "this isn't a number";
    System.setProperty(ClientHealthMonitor.CLIENT_HEALTH_MONITOR_INTERVAL_PROPERTY,
        monitorInterval);

    assertNotNull(ClientHealthMonitor
        .getInstance(mock(InternalCache.class), 0, mock(CacheClientNotifierStats.class))
        .getMonitorInterval());
  }
Creates and starts the server instance
geode-core/src/integrationTest/java/org/apache/geode/internal/cache/tier/sockets/ClientHealthMonitorIntegrationTest.java