public void SuccessfullyReturnWithDefaultValues()
        {
            var function = new NaturalLogarithmFunction();

            var inputs = function.GetInputs();

            Assert.Single(inputs);

            var result = function.Calculate(inputs);

            Assert.NotNull(result);
            Assert.Collection(result,
                              i =>
            {
                Assert.Equal(typeof(double), i.Value.GetType());
                Assert.Equal(0, TypeConverter.ToObject <int>(i.Value));
            });
        }
        public void SuccessfullyReturnGivenPositiveValue()
        {
            var function = new NaturalLogarithmFunction();

            var inputs = function.GetInputs();

            Assert.Single(inputs);

            inputs[0].Value = 27.3;

            var result = function.Calculate(inputs);

            Assert.NotNull(result);
            Assert.Collection(result,
                              i =>
            {
                Assert.Equal(typeof(double), i.Value.GetType());
                Assert.Equal(3.3068867021909143, TypeConverter.ToObject <double>(i.Value));
            });
        }