DefaultIoFilterChainBuilder builder = new DefaultIoFilterChainBuilder();
builder.addLast("A", new NoopFilter());
builder.addLast("B", new NoopFilter());
builder.addLast("C", new NoopFilter());
builder.addLast("D", new NoopFilter());
builder.addLast("E", new NoopFilter());
builder.clear();
assertEquals(0, builder.getAll().size());