Story: "Blog admin logs in to the system"

As a blog writer
I want to be able to log in to my blog
So that I can write posts and administrate my blog

Scenario: "Logs in from the login page"

Given the user enters in correct credentials for a user in the system
When the user clicks the "Login" button
Then log the user in and redirect to the admin panel with a message
stating that he logged in correctly

using System;
using Machine.Specifications;
using Machine.Specifications.Model;
using Moq;
using MyBlog.Controllers;
using System.Web.Mvc;

using MoqIt = Moq.It;
using ThenIt = Machine.Specifications.It;


[Subject("User tries logging in")]
public class When_user_enters_valid_credentials : With_user_existing_in_membership
{
    protected static ActionResult result;

    Because of = () =>
    {
        result = loginController.Login(validUsername, validPassword);
    };

    ThenIt should_log_the_user_in;
    ThenIt should_redirect_the_user_to_the_admin_panel;
    ThenIt should_show_message_confirming_successful_login;
}

public abstract class With_user_existing_in_membership
{
    protected static Mock<ISiteMembership> membershipMock;
    protected static string validUsername;
    protected static string validPassword;
    protected static LoginController loginController;

    Establish context =()=>
    {
        membershipMock = new Mock<ISiteMembership>();
        validUsername = "ValidUsername";
        validPassword = "ValidPassword";
        //make sure it's treated as valid usernames and password
        membershipMock.Setup<bool>(m => m.Validate(MoqIt.Is<string>(s => s == validUsername), MoqIt.Is<string>(s => s == validPassword)))
                      .Returns(true);
        loginController = new LoginController(membershipMock.Object);
    };

}

// The "Subject" attribute is used as the "Scenario" in
// in your original story, and gets rendered with your
// MSpec report that is outputted (especially the HTML version).
[Subject("Login Page")]
public class When_user_enters_valid_credentials_for_existing_user
    : MembershipContext
{
    static ActionResult result;
    static string username;
    static string password;

    // This is optional, but will inherit the MembershipContext, and
    // allow for more specific setup of your context for these
    // grouped specs only.
    Establish context = () =>
    {
        username = "ValidUsername";
        password = "ValidPassword";

        // This is context-specific: Username/password is valid
        membership.Setup<bool>(
            m => m.Validate(
                Param.Is<string>(s => s == username)
                ,Param.Is<string>(s => s == password)
            )
        ).Returns(true);
    };

    Because of = () =>
    {
        result = loginController.Login(username, password);
    };

    It should_log_the_user_in;
    It should_redirect_the_user_to_the_admin_panel;
    It should_show_message_confirming_successful_login;
}

public abstract class MembershipContext
{
    protected static Mock<ISiteMembership> membership;
    protected static LoginController loginController;

    Establish context = () =>
    {
        membership = new Mock<ISiteMembership>();
        loginController = new LoginController(membershipMock.Object);
    };
}