using System;

using System.Collections.Generic;

using System.Web;

using System.Linq;

​

public class Program

{

    public static void Main()

    {

        new UnitTests().PerformUnitTest();

    }

}

​

// INSTRUCTIONS:

​

// The CustomerValidator class retrieves a value from the current HttpContext,

// uses that value to pull a record from the database, plus makes an API call.

​

// Refactor CustomerValidator so that the PerformUnitTest() method can execute 

// without interacting with any of these external services.  GetCustomerAndValidateZip()

// must still interact with all these services when run in the context of the

// host application.

​

// Adjust the unit test so that it tests one good zip code and one bad one,

// resulting in two "PASS" lines in the console.

​

// Focus on what needs to change in CustomerValidator() and UnitTests():

// changes to the other classes would be expected in real life, but are not

// necessary for this activity.

public class UnitTests

{   

    public void PerformUnitTest()

    {

        var sut = new CustomerValidator();

        for (int i = 1000; i <= 99999; i++) { 

            string zipString = i >= 10000 ? i.ToString() : "0" + i.ToString();      

            sut.allZipCodes.Add(zipString);

        }

        Customer customer1 = new Customer() {

            ID = 1,

            ZipCode = "20878"

        };  

        Customer customer2 = new Customer() {

            ID = 2,

            ZipCode = "45.890"

        };  

        var expected = true;

        var actual = sut.ValidateZip(customer1);

        var result = expected == actual ? "PASS" : "FAIL";

        Console.WriteLine(result);

        expected = false;

        actual = sut.ValidateZip(customer2);

        result = expected == actual ? "PASS" : "FAIL";

        Console.WriteLine(result);  

​

    }

}

​

public class CustomerValidator

{

    public List<string> allZipCodes = new List<string>();

    public bool GetCustomerAndValidateZip()

    {

        Customer customer = GetCustomer();

        allZipCodes = GetAllValidZipCodes();

        return ValidateZip(customer);       

    }

    private Customer GetCustomer() { 

        var repository = new CustomerRepository();

        int customerId = (int)HttpContext.Current.Profile.GetPropertyValue("CustomerId");

        return repository.GetCustomer(customerId);

    }

​

    public bool ValidateZip(Customer customer) {    

        return allZipCodes.Contains(customer.ZipCode);

    }   

    private List<string> GetAllValidZipCodes()

    {

        var httpClient = new HttpClient();

        return httpClient.Get<List<string>>("http://somezipcodeapi.com/GetAll");

    }

}

​

public class Customer

{

    public int ID { get; set; }

    public string ZipCode { get; set; }

}

​

public class CustomerRepository

{

    public Customer GetCustomer(int customerId)

    {

        var db = new DbContext();

        return db.Customers.SingleOrDefault(i => i.ID == customerId);

    }

}

​

public class DbContext

{

    public List<Customer> Customers { get; set; }

}

​

public class HttpClient

{

    public T Get<T>(string url)

    {

        // perform HTTP call and return response

        return default(T);

    }

}