public void Update_Existing()
{
var expenses = TestExpensesFactory.GetTestExpenses(1);
sut.Insert(expenses);
expenses = sut.GetAll();
var firstExpense = expenses.First();
var details = Guid.NewGuid().ToString();
firstExpense.Details = details;
sut.Update(new Transaction[] { firstExpense });
expenses = sut.GetAll();
Assert.AreEqual(details, expenses.First().Details);
}
