public void Execute_DerivativeNonExistentFunction_ErrorReturned()
{
var fs = new FunctionStorage();
var command = new DerivativeOfTheFunction("Name");
const string expectedResult = "Name не найдена";
Assert.AreEqual(expectedResult, command.Execute(fs));
}
public void Execute_DerivativeExistingFunction_DerivativeWillBeCalculated()
{
var fs = new FunctionStorage();
fs.Add("Name", new Linear(2, 1));
var command = new DerivativeOfTheFunction("Name");
var res = command.Execute(fs);
const string expectedResult = "Функция добавлена в хранилище.\nПроизводная Name = 2";
Assert.AreEqual(expectedResult, res);
}