### Question:
StorageServerChannelManager implements AutoCloseable { @Nullable public StorageServerChannel getChannel(Endpoint endpoint) { lock.readLock().lock(); try { return channels.get(endpoint); } finally { lock.readLock().unlock(); } } StorageServerChannelManager(StorageClientSettings settings); @VisibleForTesting  StorageServerChannelManager(Function<Endpoint, StorageServerChannel> channelFactory); boolean addStorageServer(Endpoint endpoint, StorageServerChannel channel); StorageServerChannel getOrCreateChannel(Endpoint endpoint); @Nullable StorageServerChannel getChannel(Endpoint endpoint); @Nullable StorageServerChannel removeChannel(Endpoint endpoint, StorageServerChannel channel); @Override void close();  }### Answer:
@Test public void testGetNullChannel() { assertNull(channelManager.getChannel(endpoint1)); }