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();

        var expected = true;

        var actual = sut.GetCustomerAndValidateZip("11111");

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

        Console.WriteLine(result);

        expected = false;

        actual = sut.GetCustomerAndValidateZip("12345");

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

        Console.WriteLine(result);

    }

}

​

public class CustomerValidator

{

    public bool GetCustomerAndValidateZip(string testZip = "")

    {

        var allZipCodes = new List<string>();

        var customer = new Customer();

        var useLiveServices = string.IsNullOrEmpty(testZip);

        if (useLiveServices)

        {

            var repository = new CustomerRepository();

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

            customer = repository.GetCustomer(customerId);  

            allZipCodes = GetAllValidZipCodes();

        }

        else

        {

            customer = new Customer{

                    ID = 1, 

                    ZipCode = testZip};

            allZipCodes.Add("11111");

        }       

        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);

    }

}