public void AnArgumentNullExceptionShouldBeThrown()
            {
                var typeConverter = new TimeSpanTypeConverter();

                var exception = Assert.Throws <System.ArgumentNullException>(
                    () => typeConverter.ConvertFromDbValue(null, 0, typeof(System.TimeSpan)));

                Assert.Equal("reader", exception.ParamName);
            }
            public void AnArgumentNullExceptionShouldBeThrown()
            {
                var typeConverter = new TimeSpanTypeConverter();

                var exception = Assert.Throws <System.ArgumentNullException>(
                    () => typeConverter.ConvertFromDbValue(new Mock <IDataReader>().Object, 0, null));

                Assert.Equal("type", exception.ParamName);
            }