### Question:
DefaultChannelManager implements ChannelManager { @NotNull @Override public Optional<NetworkChannel> getChannel(@NotNull String name) { return Optional.ofNullable(this.channels.get(name)); }  @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(3) void testGetChannel() { Assertions.assertTrue(this.channelManager.getChannel("TestChannel").isPresent()); Assertions.assertFalse(this.channelManager.getChannel("Testchannel").isPresent()); }