### Question:
DefaultChannelManager implements ChannelManager { @NotNull @Override public @UnmodifiableView Collection<NetworkChannel> getNetworkChannels(@NotNull String remoteAddress) { return Streams.allOf(this.channels.values(), channel -> channel.getAddress().equals(remoteAddress)); }  @NotNull @Override Optional<NetworkChannel> getChannel(@NotNull String name); @NotNull @Override @UnmodifiableView Collection<NetworkChannel> getNetworkChannels(@NotNull String remoteAddress); @NotNull @Override Optional<NetworkChannel> getFirstChannel(); @NotNull @Override @UnmodifiableView Collection<NetworkChannel> getRegisteredChannels(); @NotNull @Override NetworkChannel createChannel(@NotNull Channel channel); @Override void registerChannel(@NotNull NetworkChannel channel); @Override void unregisterChannel(@NotNull String name);  }### Answer:
@Test @Order(4) void testGetNetworkChannels() { Assertions.assertEquals(1, this.channelManager.getNetworkChannels("127.0.0.1").size()); }