DoubleToleranceConstraint.cs

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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;
        }

        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);
        }
    }
}