public void Derivative_Cos_CorrectResultReturned()
{
var cos = new Cos();
var expectedResult = new UnaryMinusOfFunction(new Sin());
Assert.AreEqual(expectedResult, cos.Derivative());
}
public void ValueAtPoint_Sin_CorrectResultReturned()
{
var a = new UnaryMinusOfFunction(new Sin());
const double X = 1;
var expectedResult = Math.Sin(-X);
Assert.AreEqual(expectedResult, a.ValueAtPoint(X));
}
public void BuiltFunction_FunctionContainsTwoAdditionOfFunctions_CorrectResultReturned()
{
const string function = "u -(af l x+3 + af p x^3-5 + cos)";
var res = new AddInStorageBuilder().BuildFunction(function);
var expectedResult = new UnaryMinusOfFunction(
new AdditionOfFunctions(new Linear(1, 3),
new AdditionOfFunctions(new Polynomial(new List <double> {
-5, 0, 0, 1
}),
new Cos())));
Assert.AreEqual(expectedResult, res);
}
