Tests that the cache storage list live updates.

Dumping CacheStorage tree:
    (empty)
Dumping CacheStorage tree:
    cache: testCache1 - http://127.0.0.1:8000
        (cache empty)
Dumping CacheStorage tree:
    cache: testCache1 - http://127.0.0.1:8000
        (cache empty)
    cache: testCache2 - http://127.0.0.1:8000
        (cache empty)
Dumping CacheStorage tree:
    cache: testCache2 - http://127.0.0.1:8000
        (cache empty)