409845 add test that makes sure that DataFrameGenerator correctly prepends the header information

jetty-spdy/spdy-core/src/test/java/org/eclipse/jetty/spdy/generator/DataFrameGeneratorTest.java

@@ -0,0 +1,110 @@
+//
+//  ========================================================================
+//  Copyright (c) 1995-2013 Mort Bay Consulting Pty. Ltd.
+//  ------------------------------------------------------------------------
+//  All rights reserved. This program and the accompanying materials
+//  are made available under the terms of the Eclipse Public License v1.0
+//  and Apache License v2.0 which accompanies this distribution.
+//
+//      The Eclipse Public License is available at
+//      http://www.eclipse.org/legal/epl-v10.html
+//
+//      The Apache License v2.0 is available at
+//      http://www.opensource.org/licenses/apache2.0.php
+//
+//  You may elect to redistribute this code under either of these licenses.
+//  ========================================================================
+//
+
+package org.eclipse.jetty.spdy.generator;
+
+import java.nio.ByteBuffer;
+import java.util.Random;
+
+import org.eclipse.jetty.io.ArrayByteBufferPool;
+import org.eclipse.jetty.spdy.api.ByteBufferDataInfo;
+import org.eclipse.jetty.spdy.api.DataInfo;
+import org.eclipse.jetty.spdy.frames.DataFrame;
+import org.eclipse.jetty.util.BufferUtil;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
+
+import static org.hamcrest.CoreMatchers.is;
+import static org.junit.Assert.assertThat;
+
+@RunWith(JUnit4.class)
+public class DataFrameGeneratorTest
+{
+    private int increment = 1024;
+    private int streamId = 1;
+    private ArrayByteBufferPool bufferPool;
+    private DataFrameGenerator dataFrameGenerator;
+    private ByteBuffer headerBuffer = ByteBuffer.allocate(DataFrame.HEADER_LENGTH);
+
+    @Before
+    public void setUp()
+    {
+        bufferPool = new ArrayByteBufferPool(64, increment, 8192);
+        dataFrameGenerator = new DataFrameGenerator(bufferPool);
+        headerBuffer.putInt(0, streamId & 0x7F_FF_FF_FF);
+
+    }
+
+    @Test
+    public void testGenerateSmallFrame()
+    {
+        int bufferSize = 256;
+        generateFrame(bufferSize);
+    }
+
+    @Test
+    public void testGenerateFrameWithBufferThatEqualsBucketSize()
+    {
+        int bufferSize = increment;
+        generateFrame(bufferSize);
+    }
+
+    @Test
+    public void testGenerateFrameWithBufferThatEqualsBucketSizeMinusHeaderLength()
+    {
+        int bufferSize = increment - DataFrame.HEADER_LENGTH;
+        generateFrame(bufferSize);
+    }
+
+    private void generateFrame(int bufferSize)
+    {
+        ByteBuffer byteBuffer = createByteBuffer(bufferSize);
+        ByteBufferDataInfo dataInfo = new ByteBufferDataInfo(byteBuffer, true);
+        fillHeaderBuffer(bufferSize);
+        ByteBuffer dataFrameBuffer = dataFrameGenerator.generate(streamId, bufferSize, dataInfo);
+
+        assertThat("The content size in dataFrameBuffer matches the buffersize + header length",
+                dataFrameBuffer.limit(),
+                is(bufferSize + DataFrame.HEADER_LENGTH));
+
+        byte[] headerBytes = new byte[DataFrame.HEADER_LENGTH];
+        dataFrameBuffer.get(headerBytes, 0, DataFrame.HEADER_LENGTH);
+        
+        assertThat("Header bytes are prepended", headerBytes, is(headerBuffer.array()));
+    }
+
+    private ByteBuffer createByteBuffer(int bufferSize)
+    {
+        byte[] bytes = new byte[bufferSize];
+        new Random().nextBytes(bytes);
+        ByteBuffer byteBuffer = bufferPool.acquire(bufferSize, false);
+        BufferUtil.flipToFill(byteBuffer);
+        byteBuffer.put(bytes);
+        BufferUtil.flipToFlush(byteBuffer, 0);
+        return byteBuffer;
+    }
+
+    private void fillHeaderBuffer(int bufferSize)
+    {
+        headerBuffer.putInt(4, bufferSize & 0x00_FF_FF_FF);
+        headerBuffer.put(4, DataInfo.FLAG_CLOSE);
+    }
+
+}