Add a test that I wrote while working on some OOME problem

src/test/java/org/jboss/netty/channel/socket/nio/SocketReceiveBufferAllocatorTest.java

@@ -0,0 +1,40 @@
+/*
+ * Copyright 2012 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.jboss.netty.channel.socket.nio;
+
+import static org.junit.Assert.*;
+
+import org.junit.Test;
+
+public class SocketReceiveBufferAllocatorTest {
+
+    @Test
+    public void testDecreaseBuffer() {
+        SocketReceiveBufferAllocator allocator = new SocketReceiveBufferAllocator(2, 80);
+        assertEquals(8192, allocator.get(8192).capacity());
+        assertEquals(8192, allocator.get(1024).capacity());
+        
+        // Not 80% of the capacity so should just return the old buffer
+        assertEquals(8192, allocator.get(8000).capacity());
+
+        assertEquals(8192, allocator.get(1024).capacity());
+        assertEquals(1024, allocator.get(1024).capacity());
+
+        allocator.releaseExternalResources();
+    }
+
+}