public void Derivative_CosPlusSin_CorrectResultReturned()
{
Function a = new Cos();
Function b = new Sin();
var res = a + b;
var expectedResult = new AdditionOfFunctions(new UnaryMinusOfFunction(new Sin()), new Cos());
Assert.AreEqual(expectedResult, res.Derivative());
}
[Test] public void BuiltFunction_LinearPlusPolynomial_CorrectResultReturned()
{
const string function = "af l x+3 + p x^3-5";
var res = new AddInStorageBuilder().BuildFunction(function);
var expectedResult = new AdditionOfFunctions(new Linear(1, 3), new Polynomial(new List <double> {
-5, 0, 0, 1
}));
Assert.AreEqual(expectedResult, res);
}