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diff --git a/OpenSim/Tests/Common/DoubleToleranceConstraint.cs b/OpenSim/Tests/Common/DoubleToleranceConstraint.cs
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+/*
+ * Copyright (c) Contributors, http://opensimulator.org/
+ * See CONTRIBUTORS.TXT for a full list of copyright holders.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in the
+ *       documentation and/or other materials provided with the distribution.
+ *     * Neither the name of the OpenSimulator Project nor the
+ *       names of its contributors may be used to endorse or promote products
+ *       derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+using System;
+using NUnit.Framework;
+using NUnit.Framework.Constraints;
+
+namespace OpenSim.Tests.Common
+{
+    public class DoubleToleranceConstraint : ANumericalToleranceConstraint
+    {
+        private double _baseValue;
+        private double _valueToBeTested;
+
+        public DoubleToleranceConstraint(double baseValue, double tolerance) : base(tolerance)
+        {
+            _baseValue = baseValue;
+        }
+
+        ///<summary>
+        ///Test whether the constraint is satisfied by a given value
+        ///</summary>
+        ///<param name="valueToBeTested">The value to be tested</param>
+        ///<returns>
+        ///True for success, false for failure
+        ///</returns>
+        public override bool Matches(object valueToBeTested)
+        {
+            if (valueToBeTested == null)
+            {
+                throw new ArgumentException("Constraint cannot be used upon null values.");
+            }
+            if (valueToBeTested.GetType() != typeof(double))
+            {
+                throw new ArgumentException("Constraint cannot be used upon non double-values.");
+            }
+
+            _valueToBeTested = (double)valueToBeTested;
+
+            return IsWithinDoubleConstraint(_valueToBeTested, _baseValue);
+        }
+
+        public override void WriteDescriptionTo(MessageWriter writer)
+        {
+            writer.WriteExpectedValue(string.Format("A value {0} within tolerance of plus or minus {1}",_baseValue,_tolerance));
+        }
+
+        public override void WriteActualValueTo(MessageWriter writer)
+        {
+            writer.WriteActualValue(_valueToBeTested);
+        }
+    }
+}