public void Execute_AddFunction_FunctionWillBeAdded()
{
var fs = new FunctionStorage();
var command = new AddInStorage("name", new Cos());
var res = command.Execute(fs);
const string expectedResult = "Функция добавлена";
Assert.AreEqual(expectedResult, res);
}
public void Execute_AddExistingFunctionFunction_ErrorReturned()
{
var fs = new FunctionStorage();
var command = new AddInStorage("name", new Cos());
fs.Add("name", new Sin());
var res = command.Execute(fs);
const string expectedResult = "name уже используется";
Assert.AreEqual(expectedResult, res);
}