--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/visualizer/Data/test/unit/src/com/sun/hotspot/igv/data/ChangedEventTest.java	Tue Feb 07 22:41:09 2012 +0100
@@ -0,0 +1,95 @@
+/*
+ * Copyright (c) 2008, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code 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 General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+package com.sun.hotspot.igv.data;
+
+import static org.junit.Assert.assertEquals;
+import org.junit.*;
+
+/**
+ *
+ * @author Thomas Wuerthinger
+ */
+public class ChangedEventTest {
+
+    public ChangedEventTest() {
+    }
+
+    @BeforeClass
+    public static void setUpClass() throws Exception {
+    }
+
+    @AfterClass
+    public static void tearDownClass() throws Exception {
+    }
+
+    @Before
+    public void setUp() {
+    }
+
+    @After
+    public void tearDown() {
+    }
+
+    /**
+     * Test of addListener method, of class Event.
+     */
+    @Test
+    public void testBase() {
+
+        ChangedEvent<Integer> e = new ChangedEvent<>(5);
+        final int[] fireCount = new int[1];
+
+        e.addListener(new ChangedListener<Integer>() {
+            @Override
+            public void changed(Integer s) {
+                assertEquals(s.intValue(), 5);
+                fireCount[0]++;
+            }
+        });
+
+        e.fire();
+        assertEquals(1, fireCount[0]);
+
+        e.fire();
+        assertEquals(2, fireCount[0]);
+
+        e.beginAtomic();
+
+        e.fire();
+        assertEquals(2, fireCount[0]);
+
+        e.fire();
+        assertEquals(2, fireCount[0]);
+
+        e.fire();
+        assertEquals(2, fireCount[0]);
+
+        e.endAtomic();
+        assertEquals(3, fireCount[0]);
+
+    }
+
+
+}
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