using System;

using System.Collections.Generic;

using System.Web;

using System.Linq;

​

public class Program

{

    public static void Main()

    {

        new UnitTests().PerformUnitTest();

    }

}

​

// INSTRUCTIONS:

// The CustomerManager class will be used inside an ASP.NET aplication.  It has 

// an UpdateZip() method that updates a customer's zip code after validating it.  

// To do so, it retrieves a value from the current HttpContext and requires an 

// API call to validate the new zip.

//

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

// without interacting with any of these external services and return two PASS lines

// in the console.  (If necessary, update other classes so that tests can execute.)

//

// UpdateZip() must be constructed in such a way that it can still interact with the 

// HttpContext and DbContext when run in the context of the real application.

// (It's not necessary to show how that will be done.)

//

​

public class UnitTests

{

    public void PerformUnitTest()

    {

        var httpContext = 1; // Would be (int)HttpContext.Current.Profile.GetPropertyValue("CustomerId");

        var sut = new CustomerManager(new CustomerRepository(), httpContext);

​

        // No need to make any changes to this method below this line.

        var expected = true;

        var actual = sut.UpdateZip("12345"); // GOOD zip code

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

        Console.WriteLine(result);

        expected = false;

        actual = sut.UpdateZip("9999"); // BAD zip code

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

        Console.WriteLine(result);

    }

}

​

public class CustomerManager

{

    public CustomerManager(CustomerRepository customerRepository, int customerId)

    {

        CustomerRepository = customerRepository;

        CustomerId = customerId;

    }

    public CustomerRepository CustomerRepository { get; set; }

    public int CustomerId { get; set; }

​

    public bool UpdateZip(string newZipCode)

    {

        var allZipCodes = GetAllValidZipCodes();

        if (allZipCodes.Contains(newZipCode))

        {

            CustomerRepository.UpdateZip(CustomerId, newZipCode);

            return true;

        }

        else

        {

            return false;

        }

    }

​

    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 void UpdateZip(int customerId, string newZipCode)

    {

        var db = new DbContext();

        var customer = db.Customers.SingleOrDefault(i => i.ID == customerId) ?? new Customer(){ID = customerId, ZipCode = newZipCode};

        customer.ZipCode = newZipCode;

    }

}

​

public class DbContext

{

    public List<Customer> Customers

    {

        get;

        set;

    } = new List<Customer>();

}

​

public class HttpClient

{

    public T Get<T>(string url)

    {

        // perform HTTP call and return response

        var x = (T) Convert.ChangeType(new List<string>(){"12345"}, typeof(T));

        return x ;

    }

}