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(new MockCustomerRepository(), new MockHttpContextCustomer(5), new MockValidZipCodesCustomer());

        var expected = true;

        var actual = sut.GetCustomerAndValidateZip();

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

        Console.WriteLine(result);

        sut = new CustomerValidator(new MockCustomerRepository(), new MockHttpContextCustomer(25), new MockValidZipCodesCustomer());

        expected = false;

        actual = sut.GetCustomerAndValidateZip();

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

        Console.WriteLine(result);

    }

}

​

public class CustomerValidator

{

    private IDataRepo _dataRepo;

    private IHttpContextCustomer _httpContextCustomer;

    private IValidZipCodes _validZipCodes;

    public CustomerValidator(IDataRepo dataRepo, IHttpContextCustomer httpContextCustomer, IValidZipCodes validZipCodes)

    {

        _dataRepo = dataRepo;

        _httpContextCustomer=httpContextCustomer;

        _validZipCodes=validZipCodes;

    }

    public bool GetCustomerAndValidateZip()

    {

        //var repository = new CustomerRepository();

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

        var customer = _dataRepo.GetCustomer(customerId);

        var allZipCodes = _validZipCodes.GetAllValidZipCodes();

        return allZipCodes.Contains(customer.ZipCode);

    }

​

​

}

public interface IValidZipCodes{

 List<string> GetAllValidZipCodes();

}

public class ValidZipCodesCustomer:IValidZipCodes{

    public List<string> GetAllValidZipCodes()

    {

        var httpClient = new HttpClient();

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

    }

}

public class MockValidZipCodesCustomer:IValidZipCodes{

    public List<string> GetAllValidZipCodes()

    {

        return new List<string>(new string[] {"11111","22222"});

    }

}

​

public interface IHttpContextCustomer{

    int GetPropertyValue();

}

​

public class HttpContextCustomer: IHttpContextCustomer{

    public int GetPropertyValue(){

        return (int)HttpContext.Current.Profile.GetPropertyValue("CustomerId");

    }

}

​

public class MockHttpContextCustomer: IHttpContextCustomer{

    int _customerID;

    public MockHttpContextCustomer(int customerID){

        _customerID=customerID;

    }

    public int GetPropertyValue(){

        return _customerID;

    }

}

​

public class Customer

{

    public int ID { get; set; }

    public string ZipCode { get; set; }

}

​

public interface IDataRepo{

     Customer GetCustomer(int customerId);

}

​

public class CustomerRepository: IDataRepo

{

    public Customer GetCustomer(int customerId)

    {

        var db = new DbContext();

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

    }

}

public class MockCustomerRepository: IDataRepo

{

    private IList<Customer> _customers;

    public MockCustomerRepository(){

        IList<Customer> customers = new List<Customer>(){ 

            new Customer(){ID=5, ZipCode="11111"},

            new Customer(){ID=25, ZipCode="aaaaa"}

        };  

        _customers=customers;

    }

    public Customer GetCustomer(int customerId)

    {

        return _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);

    }

}

​

​