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diff --git a/indra/llmath/tests/llmodularmath_test.cpp b/indra/llmath/tests/llmodularmath_test.cpp
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+/**
+ * @file modularmath_test.cpp
+ * @author babbage
+ * @date 2008-09
+ * @brief llmodularmath tests
+ *
+ * $LicenseInfo:firstyear=2007&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2010, Linden Research, Inc.
+ * 
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License only.
+ * 
+ * This library 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
+ * Lesser General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ * 
+ * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
+ * $/LicenseInfo$
+ */
+ 
+#include "linden_common.h"
+
+#include "../llmodularmath.h"
+
+#include "../test/lltut.h"
+
+namespace tut
+{
+	struct modularmath_data
+	{
+	};
+	typedef test_group<modularmath_data> modularmath_test;
+	typedef modularmath_test::object modularmath_object;
+	tut::modularmath_test modularmath_testcase("LLModularMath");
+
+	template<> template<>
+	void modularmath_object::test<1>()
+	{
+		// lhs < rhs
+		const U32 lhs = 0x000001;
+		const U32 rhs = 0xFFFFFF;
+		const U32 width = 24;
+		U32 result = LLModularMath::subtract<width>(lhs, rhs); 
+		ensure_equals("diff(0x000001, 0xFFFFFF, 24)", result, 2);
+	}
+
+	template<> template<>
+	void modularmath_object::test<2>()
+	{
+		// lhs > rhs
+		const U32 lhs = 0x000002;
+		const U32 rhs = 0x000001;
+		const U32 width = 24;
+		U32 result = LLModularMath::subtract<width>(lhs, rhs); 
+		ensure_equals("diff(0x000002, 0x000001, 24)", result, 1);
+	}
+
+	template<> template<>
+	void modularmath_object::test<3>()
+	{
+		// lhs == rhs
+		const U32 lhs = 0xABCDEF;
+		const U32 rhs = 0xABCDEF;
+		const U32 width = 24;
+		U32 result = LLModularMath::subtract<width>(lhs, rhs); 
+		ensure_equals("diff(0xABCDEF, 0xABCDEF, 24)", result, 0);
+	}	
+}