A test case for NETTY-142 ReplayingDecoder calls decodeLast with unreplayable buffer

src/test/java/org/jboss/netty/handler/codec/replay/ReplayingDecoderTest.java

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+/*
+ * JBoss, Home of Professional Open Source
+ * Copyright 2005-2008, Red Hat Middleware LLC, and individual contributors
+ * by the @authors tag. See the copyright.txt in the distribution for a
+ * full listing of individual contributors.
+ *
+ * This is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * This software is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this software; if not, write to the Free
+ * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
+ */
+package org.jboss.netty.handler.codec.replay;
+
+import static org.junit.Assert.*;
+
+import org.jboss.netty.buffer.ChannelBuffer;
+import org.jboss.netty.buffer.ChannelBufferIndexFinder;
+import org.jboss.netty.buffer.ChannelBuffers;
+import org.jboss.netty.channel.Channel;
+import org.jboss.netty.channel.ChannelHandlerContext;
+import org.jboss.netty.handler.codec.embedder.DecoderEmbedder;
+import org.junit.Test;
+
+/**
+ * @author The Netty Project (netty-dev@lists.jboss.org)
+ * @author Trustin Lee (tlee@redhat.com)
+ * @version $Rev$, $Date$
+ */
+public class ReplayingDecoderTest {
+
+    @Test
+    public void testLineProtocol() {
+        DecoderEmbedder<ChannelBuffer> e = new DecoderEmbedder<ChannelBuffer>(
+                new LineDecoder());
+
+        // Ordinary input
+        e.offer(ChannelBuffers.wrappedBuffer(new byte[] { 'A' }));
+        assertNull(e.poll());
+        e.offer(ChannelBuffers.wrappedBuffer(new byte[] { 'B' }));
+        assertNull(e.poll());
+        e.offer(ChannelBuffers.wrappedBuffer(new byte[] { 'C' }));
+        assertNull(e.poll());
+        e.offer(ChannelBuffers.wrappedBuffer(new byte[] { '\n' }));
+        assertEquals(ChannelBuffers.wrappedBuffer(new byte[] { 'A', 'B', 'C' }), e.poll());
+
+        // Truncated input
+        e.offer(ChannelBuffers.wrappedBuffer(new byte[] { 'A' }));
+        assertNull(e.poll());
+        e.finish();
+        assertNull(e.poll());
+    }
+
+    private static final class LineDecoder extends ReplayingDecoder<VoidEnum> {
+
+        LineDecoder() {
+            super();
+        }
+
+        @Override
+        protected Object decode(ChannelHandlerContext ctx, Channel channel,
+                ChannelBuffer buffer, VoidEnum state) throws Exception {
+            ChannelBuffer msg = buffer.readBytes(ChannelBufferIndexFinder.LF);
+            buffer.skipBytes(1);
+            return msg;
+        }
+    }
+}