From TDD to DDD: Building a .NET Core Web API - Part 4

The complete project can be found here: https://github.com/lucianopereira86/CRUD-NetCore-TDD

Technologies

• Visual Studio 2019
• .NET Core 3.1.0
• xUnit 2.4.0
• Microsoft.EntityFrameworkCore 3.1.0
• FluentValidation 8.6.0

Post User • Fact

Refactor Step

We will concentrate the database operations inside a repository class for the user entity.

Firstly, modify the "Fact_PostUser" method like this:

[Fact]
public void Fact_PostUser()
{
    // EXAMPLE
    var user = new User(0, "LUCIANO PEREIRA", 33, true);

    // REPOSITORY
    user = new UserRepository(ctx).Post(user);

    // ASSERT
    Assert.Equal(1, user.Id);
}

As you can see, it must be created a "UserRepository" class with a "Post" method that must execute that same operations from before.

Inside the Infra project, create another file inside the "Repositories" folder named "UserRepository.cs" with the following code:

using CRUD_NETCore_TDD.Infra.Models;

namespace CRUD_NETCore_TDD.Infra.Repositories
{
    public class UserRepository
    {
        private readonly MyContext ctx;
        public UserRepository(MyContext ctx)
        {
            this.ctx = ctx;
        }
        public User Post(User user)
        {
            ctx.User.Add(user);
            ctx.SaveChanges();
            return user;
        }
    }
}

Just import the "UserRepository" class inside the "PostUserTest" file and it will compile.

Run the test again:

Our refactoring is complete!

If you have followed the instructions faithfully until here, then your project must be like this:

Next

We are still far from finishing the POST tests. It's necessary to validate the user attributes before persist them in the database, so let's create our first Theory.