public void Detect_GivenAListOfTwoOrdersWithDifferentEmailsAndSameDealId_WillReturnEmptyList()
{
Order order1 = new Order { OrderId = 1, EmailAddress = "*****@*****.**", DealId = 1, CreditCardNo = string.Empty };
Order order2 = new Order { OrderId = 2, EmailAddress = "*****@*****.**", DealId = 1, CreditCardNo = string.Empty };
var detect = Solution.DetectFraudulentOrders(new List<Order> { order1, order2 });
CollectionAssert.IsEmpty(detect);
}
public void Detect_GivenAListOfTwoOrdersWithSameAddressButDifferentCCCNoAndDifferentEmailAddresses_ReturnsBothIds()
{
Order order1 = new Order { OrderId = 1, StreetAddress = "asd", City = "Asd", State = "Asd", ZipCode = "asd", DealId = 1, CreditCardNo = "12345689010", EmailAddress = "*****@*****.**" };
Order order2 = new Order { OrderId = 2, StreetAddress = "aSd", City = "asd", State = "asd", ZipCode = "asD", DealId = 1, CreditCardNo = "12345689011", EmailAddress = "*****@*****.**" };
var detect = Solution.DetectFraudulentOrders(new List<Order> { order1, order2 });
CollectionAssert.Contains(detect, 1);
CollectionAssert.Contains(detect, 2);
}
public void Detect_GivenAListOfTwoOrdersWithEmailOnlyDifferentByCaseAndSameDealIdButDifferentCCCNo_WillReturnBothIds()
{
Order order1 = new Order { OrderId = 1, EmailAddress = "[email protected]", DealId = 1, CreditCardNo = "12345689010" };
Order order2 = new Order { OrderId = 2, EmailAddress = "[email protected]", DealId = 1, CreditCardNo = "12345689011" };
var detect = Solution.DetectFraudulentOrders(new List<Order> { order1, order2 });
CollectionAssert.Contains(detect, 1);
CollectionAssert.Contains(detect, 2);
}
public void Detect_GivenAListOfTwoOrdersWithEmailDifferentOnlyByPartAfterPlusButDifferentCCCNo_ReturnsBothIds()
{
Order order1 = new Order { OrderId = 1, EmailAddress = "*****@*****.**", DealId = 1, CreditCardNo = "12345689010" };
Order order2 = new Order { OrderId = 2, EmailAddress = "*****@*****.**", DealId = 1, CreditCardNo = "12345689011" };
var detect = Solution.DetectFraudulentOrders(new List<Order> { order1, order2 });
CollectionAssert.Contains(detect, 1);
CollectionAssert.Contains(detect, 2);
}
public void Detect_GivenAListOfTwoOrdersWithSameEmailAndSameDealIdButSameCCCNo_ReturnsEmptyList()
{
Order order1 = new Order { OrderId = 1, EmailAddress = "*****@*****.**", DealId = 1, CreditCardNo = "12345689011" };
Order order2 = new Order { OrderId = 2, EmailAddress = "*****@*****.**", DealId = 1, CreditCardNo = "12345689011" };
var detect = Solution.DetectFraudulentOrders(new List<Order> { order1, order2 });
CollectionAssert.IsEmpty(detect);
}
public void Normalize_Always_ReplacesLongWordsWithTheirShortForms()
{
var order = new Order
{
StreetAddress = "Street Road",
State = "Illinois California New York",
};
var orders = new List<Order> { order };
Solution.Normalize(orders);
order = orders[0];
Assert.AreEqual("st. rd.", order.StreetAddress);
Assert.AreEqual("il ca ny", order.State);
}
public void Detect_GivenAListOfTwoOrdersWithTheSameEmailAddressAndDealIdButDifferentCCCNo_WillReturnBothIdsInAscendingOrder()
{
Order order1 = new Order { OrderId = 1, EmailAddress = "[email protected]", DealId = 1, CreditCardNo = "12345689010" };
Order order2 = new Order { OrderId = 2, EmailAddress = "[email protected]", DealId = 1, CreditCardNo = "12345689011" };
var detect = Solution.DetectFraudulentOrders(new List<Order> { order1, order2 });
Assert.AreEqual(1, detect[0]);
Assert.AreEqual(2, detect[1]);
}
public void Normalize_Always_NormalizesEmailAddress()
{
var order = new Order
{
EmailAddress = "*****@*****.**"
};
var orders = new List<Order> { order };
Solution.Normalize(orders);
order = orders[0];
Assert.AreEqual("*****@*****.**", order.EmailAddress);
}
private static void NormalizeOrder(Order order)
{
NormalizeAddress(order);
order.EmailAddress = NormalizeEmailAddress(order);
}
private static string NormalizeEmailAddress(Order order)
{
var emailAddress = order.EmailAddress.ToLowerInvariant();
var emailParts = emailAddress.Split('@');
var userName = emailParts[0].Replace(".", string.Empty);
userName = userName.Split('+')[0];
var address = string.Join("@", userName, emailParts[1]);
return address;
}
private static void NormalizeAddress(Order order)
{
order.StreetAddress = order.StreetAddress.ToLowerInvariant();
order.City = order.City.ToLowerInvariant();
order.State = order.State.ToLowerInvariant();
order.ZipCode = order.ZipCode.ToLowerInvariant();
foreach (var stateReplacer in stateReplacers)
{
order.State = order.State.Replace(stateReplacer.Key, stateReplacers[stateReplacer.Key]);
}
foreach (var addressReplacer in addressReplacers)
{
order.StreetAddress = order.StreetAddress.Replace(addressReplacer.Key, addressReplacers[addressReplacer.Key]);
}
}
private static bool IsSameAddress(Order order1, Order order2)
{
return order1.StreetAddress == order2.StreetAddress
&& order1.City == order2.City
&& order1.State == order2.State
&& order1.ZipCode == order2.ZipCode;
}
private static bool AreFraudulent(Order order1, Order order2)
{
var areFraudulent = order1.DealId == order2.DealId;
areFraudulent &= !(order1.CreditCardNo.Equals(order2.CreditCardNo, StringComparison.InvariantCulture));
areFraudulent &= (order1.EmailAddress == order2.EmailAddress) || IsSameAddress(order1, order2);
return areFraudulent;
}