public void CanInsertTenPounds()
        {
            var provider = new NoteCreditProvider();

            provider.InsertNote(NoteDenomination.TenPound);
            Assert.AreEqual(10, provider.Total);
        }
        public void CanNotInsertMultipleNotes()
        {
            var provider = new NoteCreditProvider();

            provider.InsertNote(NoteDenomination.FivePound);
            Assert.IsFalse(provider.InsertNote(NoteDenomination.FivePound));
            Assert.AreEqual(5, provider.Total);
        }