Provide a basic test for getBufferFor()

buffer/src/test/java/io/netty/buffer/AbstractCompositeChannelBufferTest.java

@@ -16,6 +16,7 @@
 package io.netty.buffer;
 
 import static io.netty.buffer.Unpooled.*;
+import java.io.IOException;
 import static org.junit.Assert.*;
 
 import java.nio.ByteBuffer;
@@ -89,6 +90,25 @@ public abstract class AbstractCompositeChannelBufferTest extends
     protected boolean discardReadBytesDoesNotMoveWritableBytes() {
         return false;
     }
+    
+    /**
+     * Tests the "getBufferFor" method
+     */
+    @Test
+    public void testGetBufferFor() throws IOException {
+        CompositeByteBuf buf = (CompositeByteBuf) Unpooled.wrappedBuffer(new byte[] { 1, 2, 3, 4, 5 }, new byte[] {4, 5, 6, 7, 8, 9, 26});
+    
+        //Ensure that a random place will be fine
+        assertEquals(buf.getBufferFor(2).capacity(), 5);
+        
+        //Loop through each byte
+        
+        byte index = 0;
+        
+        while (index < buf.capacity()) {
+            assertNotNull(buf.getBufferFor(index++));
+        }
+    }
 
     @Test
     public void testDiscardReadBytes3() {