Adding testcase for windowed Generator

jetty-websocket/websocket-core/src/test/java/org/eclipse/jetty/websocket/protocol/GeneratorTest.java

@@ -0,0 +1,43 @@
+package org.eclipse.jetty.websocket.protocol;
+
+import static org.hamcrest.Matchers.*;
+
+import java.nio.ByteBuffer;
+import java.util.Arrays;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+public class GeneratorTest
+{
+    @Test
+    public void testWindowedGenerate()
+    {
+        byte payload[] = new byte[10240];
+        Arrays.fill(payload,(byte)0x44);
+
+        WebSocketFrame frame = WebSocketFrame.binary(payload);
+
+        int totalParts = 0;
+        int totalBytes = 0;
+        int windowSize = 1024;
+        int expectedHeaderSize = 4; // TODO: correct size
+        int expectedParts = (payload.length + expectedHeaderSize) / windowSize;
+
+        Generator generator = new UnitGenerator();
+
+        boolean done = false;
+        while (!done)
+        {
+            Assert.assertThat("Too many parts",totalParts,lessThan(20));
+
+            ByteBuffer buf = generator.generate(windowSize,frame);
+
+            totalBytes += buf.remaining();
+            totalParts++;
+        }
+
+        Assert.assertThat("Created Parts",totalParts,is(expectedParts));
+        Assert.assertThat("Created Bytes",totalBytes,is(payload.length + expectedHeaderSize));
+    }
+}