public void SutEvaluatesAsSumOfInputs(IEnumerable<double> inputs, DoubleSumFunction sut)
{
var result = sut.Evaluate(inputs);
var expected = inputs.Sum();
Assert.Equal<double>(expected, result);
}
public void SutIsEvaluatable(DoubleSumFunction sut)
{
Assert.IsAssignableFrom<ITransformingFunction<IEnumerable<double>, double>>(sut);
}