public void Exception()
{
_repo.GetAll().Returns(new List <Budget>());
TotalAmountShouldBe(new DateTime(2018, 1, 1), new DateTime(2018, 1, 1), 0);
BudgetCalculator budgetCalculator = new BudgetCalculator(_repo);
var amount = budgetCalculator.GetAmount(new DateTime(2018, 2, 1), new DateTime(2018, 1, 1));
}
private void TotalAmountShouldBe(DateTime startDate, DateTime endDate, int expected)
{
AmountShouldBe(expected, _budgetCalculator.GetAmount(startDate, endDate));
}