RpcFrameDecoder decoder = new RpcFrameDecoder();
// Test "Length field is not received yet"
ByteBuffer buffer = ByteBuffer.allocate(1);
ChannelBuffer buf = new ByteBufferBackedChannelBuffer(buffer);
ChannelBuffer channelBuffer = (ChannelBuffer) decoder.decode(
Mockito.mock(ChannelHandlerContext.class), Mockito.mock(Channel.class),
buf);
assertTrue(channelBuffer == null);
// Test all bytes are not received yet