public void AddAndRetrieveRuleSet()
{
var sut = new PaymentProcessor(new TextRepository());
sut.AddRuleSet("CIRCLE_K", 15, 5);
var rules = sut.GetRules();
Assert.Single(rules);
var set = rules.Single();
Assert.Equal("CIRCLE_K", set.MerchantName);
Assert.Equal(15, set.FeePercentageDiscount);
Assert.Equal(5, set.FixedFeePerMonth);
}