public void AsDoubleNegativeTest()
        {
            double defaultValue = 0F;
            string value        = "a12";
            double actual       = StringExtensions.AsDouble(value, defaultValue);

            Assert.AreEqual(defaultValue, actual);
        }
        public void AsDoubleTest()
        {
            double defaultValue = 0F;
            double expected     = 5F;
            string value        = Convert.ToString(expected, CultureInfo.InvariantCulture);
            double actual       = StringExtensions.AsDouble(value, defaultValue);

            Assert.AreEqual(expected, actual);
        }