--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.graal.debug.test/src/com/oracle/graal/debug/test/DebugHistogramTest.java	Sat Apr 13 17:55:43 2013 +0200
@@ -0,0 +1,86 @@
+/*
+ * Copyright (c) 2013, 2013, 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.oracle.graal.debug.test;
+
+import java.io.*;
+
+import org.junit.*;
+
+import com.oracle.graal.debug.*;
+
+public class DebugHistogramTest {
+
+    @Test
+    public void testEmptyHistogram() {
+        DebugHistogram histogram = Debug.createHistogram("TestHistogram");
+        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
+        histogram.print(new PrintStream(outputStream));
+        Assert.assertEquals("TestHistogram is empty.\n", outputStream.toString());
+    }
+
+    @Test
+    public void testSingleEntryHistogram() {
+        DebugHistogram histogram = Debug.createHistogram("TestHistogram");
+        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
+        histogram.add(new Integer(1));
+        histogram.add(new Integer(1));
+        histogram.print(new PrintStream(outputStream));
+        String[] lines = outputStream.toString().split("\n");
+        Assert.assertEquals(4, lines.length);
+        Assert.assertEquals("TestHistogram has 1 unique elements and 2 total elements:", lines[0]);
+        Assert.assertEquals(
+                        "--------------------------------------------------------------------------------------------------------------------------------------------------------------------------",
+                        lines[1]);
+        Assert.assertEquals(
+                        "| 1                                                  | 2          | ==================================================================================================== |",
+                        lines[2]);
+        Assert.assertEquals(
+                        "--------------------------------------------------------------------------------------------------------------------------------------------------------------------------",
+                        lines[3]);
+    }
+
+    @Test
+    public void testMultipleEntryHistogram() {
+        DebugHistogram histogram = Debug.createHistogram("TestHistogram");
+        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
+        histogram.add(new Integer(1));
+        histogram.add(new Integer(2));
+        histogram.add(new Integer(2));
+        histogram.print(new PrintStream(outputStream));
+        String[] lines = outputStream.toString().split("\n");
+        Assert.assertEquals(5, lines.length);
+        Assert.assertEquals("TestHistogram has 2 unique elements and 3 total elements:", lines[0]);
+        Assert.assertEquals(
+                        "--------------------------------------------------------------------------------------------------------------------------------------------------------------------------",
+                        lines[1]);
+        Assert.assertEquals(
+                        "| 2                                                  | 2          | ==================================================================================================== |",
+                        lines[2]);
+        Assert.assertEquals(
+                        "| 1                                                  | 1          | ==================================================                                                   |",
+                        lines[3]);
+        Assert.assertEquals(
+                        "--------------------------------------------------------------------------------------------------------------------------------------------------------------------------",
+                        lines[4]);
+    }
+}