@Before
  public void setUp() throws Exception {
    Properties p = new Properties();
    p.setProperty(MCAST_PORT, "0");
    p.setProperty(LOCATORS, "");
    ds = DistributedSystem.connect(p);
    c = CacheFactory.create(ds);
  }
Unit test for basic CacheListener feature. NOTE: these tests using a loner DistributedSystem and
local scope regions so all the listener features tested are for local listeners being invoked for
local operations.

@since GemFire 5.0
geode-core/src/integrationTest/java/org/apache/geode/cache/CacheListenerJUnitTest.java