using System;

using NUnit.Framework;

​

//-----------------------------------------------------------------------------

//

//  Hello and thanks for attending AccessSoftek test task for C# developer!

//

//  Here we defined IAuthenticationService and IUser interfaces along with

//  AuthToken class. Pay attention to comments.

//

//  You will need to:

//  1. Fork this fiddle.

//  2. Implement class User derived from IUser. Class User should aggregate

//     instance of IAuthenticationService interface.

//  3. Write as many unit tests for User class as you can (we are using NUnit

//     here, but you may rewrite this fiddle using framework your like).

//  4. Send us link to your fork.

//

//  Good luck!

//

//-----------------------------------------------------------------------------

​

namespace TestTask

{

#region API definition

//-----------------------------------------------------------------------------

//  Here goes API definition. You won't need to change anything here. Just pay

//  attention to comments.

//-----------------------------------------------------------------------------

    class AuthToken

    {

      /// <summary>

      /// Authentication token string.

      /// </summary>

      public String Token { get; set; }

      /// <summary>

      /// Date and time the token expires at (UTC).

      /// </summary>

      public DateTime ExpiresAt { get; set; }

    }

    interface IAuthenticationService

    {

      /// <summary>

      /// Authenticates user.

      /// </summary>

      /// <param name="username">Username.</param>

      /// <param name="password">Password.</param>

      /// <returns>Authentication token or null

      /// if user is not authorized.</returns>

      /// <exception cref="System.ArgumentNullException">

      /// Thrown when <paramref name="username"/>

      /// or <paramref name="password"/> is null.

      /// </exception>

      AuthToken Authenticate(String username, String password);

    }

​

    interface IUser

    {

      /// <summary>

      /// User's authentication token string.

      /// </summary>

      String AuthToken { get; }

    }

#endregion

​

#region Implementation of class User

//-----------------------------------------------------------------------------

//

//  >> Your implementation of class User goes below. Derive it from IUser and

//     don't forget to aggregate instance of IAuthenticationService interface.

//

//-----------------------------------------------------------------------------

    //class User : IUser

    //{

    //}

#endregion

​

#region Unit tests  

//-----------------------------------------------------------------------------

//

//  >> Your unit tests go below.

//

//-----------------------------------------------------------------------------

    [TestFixture]

    public class UserTests

    {   

    }

#endregion

​

#region Tests runner    

//-----------------------------------------------------------------------------

//  Here we are running tests. You don't need to change anything here unless

//  you are using some other framework for tests.  

//----------------------------------------------------------------------------- 

    public class Program

    {

        public static void Main() => new NUnitLite

            .AutoRun()

            .Execute(new string[]{ "--test:TestTask.UserTests", "--noc" });

    }

#endregion

}

​