EmbeddedChannel extends AbstractChannel { protected final void ensureOpen() { if (!checkOpen(true)) { checkException(); } } EmbeddedChannel();  EmbeddedChannel(ChannelId channelId);  EmbeddedChannel(ChannelHandler... handlers);  EmbeddedChannel(boolean hasDisconnect, ChannelHandler... handlers);  EmbeddedChannel(boolean register, boolean hasDisconnect, ChannelHandler... handlers);  EmbeddedChannel(ChannelId channelId, ChannelHandler... handlers);  EmbeddedChannel(ChannelId channelId, boolean hasDisconnect, ChannelHandler... handlers);  EmbeddedChannel(ChannelId channelId, boolean register, boolean hasDisconnect,
                           final ChannelHandler... handlers);  EmbeddedChannel(ChannelId channelId, boolean hasDisconnect, final ChannelConfig config,
                           final ChannelHandler... handlers); void register(); @Override ChannelMetadata metadata(); @Override ChannelConfig config(); @Override boolean isOpen(); @Override boolean isActive(); Queue<Object> inboundMessages(); @Deprecated Queue<Object> lastInboundBuffer(); Queue<Object> outboundMessages(); @Deprecated Queue<Object> lastOutboundBuffer(); @SuppressWarnings("unchecked") T readInbound(); @SuppressWarnings("unchecked") T readOutbound(); boolean writeInbound(Object... msgs); ChannelFuture writeOneInbound(Object msg); ChannelFuture writeOneInbound(Object msg, ChannelPromise promise); EmbeddedChannel flushInbound(); boolean writeOutbound(Object... msgs); ChannelFuture writeOneOutbound(Object msg); ChannelFuture writeOneOutbound(Object msg, ChannelPromise promise); EmbeddedChannel flushOutbound(); boolean finish(); boolean finishAndReleaseAll(); boolean releaseInbound(); boolean releaseOutbound(); @Override final ChannelFuture close(); @Override final ChannelFuture disconnect(); @Override final ChannelFuture close(ChannelPromise promise); @Override final ChannelFuture disconnect(ChannelPromise promise); void runPendingTasks(); long runScheduledPendingTasks(); void checkException(); @Override Unsafe unsafe();  }
@Test public void testEnsureOpen() throws InterruptedException { EmbeddedChannel channel = new EmbeddedChannel(); channel.close().syncUninterruptibly(); try { channel.writeOutbound("Hello, Netty!"); fail("This should have failed with a ClosedChannelException"); } catch (Exception expected) { assertTrue(expected instanceof ClosedChannelException); } try { channel.writeInbound("Hello, Netty!"); fail("This should have failed with a ClosedChannelException"); } catch (Exception expected) { assertTrue(expected instanceof ClosedChannelException); } }