public void TestAddAction()
{
//Arrange
string yearMonth = "2018-05";
int amount = 500;
IBudgetsService budgetService = Substitute.For <IBudgetsService>();
BudgetsController controller = new BudgetsController(budgetService);
Budget budget = new Budget {
YearMonth = yearMonth, Amount = amount
};
//Action
controller.Add(budget);
//Assert
budgetService.Received(1)
.AddBudget(Arg.Is <Budget>(b => b.YearMonth == yearMonth && b.Amount == amount));
}
