/// <summary>
        /// Filters out parameters that are not nullable.
        /// </summary>
        /// <param name="type">The type.</param>
        /// <param name="method">The method.</param>
        /// <param name="parameter">The parameter.</param>
        /// <returns><see langword="true"/> if the <paramref name="parameter"/> should be excluded;
        /// otherwise <see langword="false"/>.</returns>
        /// <exception cref="ArgumentNullException">The <paramref name="type"/>, <paramref name="method"/> or
        /// <paramref name="parameter"/> parameters are <see langword="null"/>.</exception>
        bool IParameterFilter.ExcludeParameter(Type type, MethodBase method, ParameterInfo parameter)
        {
            if (type == null)
                throw new ArgumentNullException("type");
            if (method == null)
                throw new ArgumentNullException("method");
            if (parameter == null)
                throw new ArgumentNullException("parameter");

            return !parameter.IsNullable();
        }
        public void IdentifyNullableParameters(ParameterInfo param, bool expected)
        {
            // Act
            bool actual = param.IsNullable();

            // Assert
            Assert.Equal(expected, actual);
        }