How to enforce architecture rules in C#


Unit testing is how we make sure that the blocks of code we write do what we meant them to do. There are some open-source frameworks out there to unit take a look at .NET purposes, particularly, NUnit and xUnit.Web. You must at all times incorporate unit testing in your software program improvement workflow to scale back or get rid of errors in your purposes.

You may additionally benefit from frameworks reminiscent of ArchUnit or NetArchTest to write down unit assessments that may assist implement architectural guidelines. Impressed by ArchUnit for Java, Ben Morris’s NetArchTest is a straightforward framework that can be utilized to implement structure guidelines in .NET Framework or .NET Core in addition to in .NET 6 initiatives.

This text talks concerning the significance of imposing architectural guidelines and the right way to leverage NetArchTest to attain this. To work with the code examples supplied on this article, it’s best to have Visible Studio 2022 put in in your system. When you don’t have already got a replica, you’ll be able to obtain Visible Studio 2022 right here.

The necessity for imposing architectural guidelines

There are many static code evaluation frameworks and instruments out there for checking code high quality in .NET, .NET Core, or .NET 6. Two widespread instruments are SonarQube and NDepend, for starters. Static code evaluation can also be out there as a part of Visible Studio.

Nonetheless, few of those instruments make it easier to protect the structure design patterns or implement structure guidelines in your supply code. And when you don’t commonly validate or implement these guidelines, the design or structure of your utility will degrade over time. Finally you’ll uncover that sustaining the codebase has grow to be a frightening process.

Whereas the static code evaluation instruments make it easier to to validate or implement generic finest practices, you’ll be able to benefit from NArchTest to create unit assessments that implement the structure guidelines in your .NET, .NET Core, and .NET 6 purposes. These embody conventions for sophistication design, naming, and dependency in your codebases.

You should utilize NArchTest in your unit take a look at strategies after which incorporate these take a look at strategies within the construct and launch pipeline in order that the structure guidelines are validated routinely with every check-in.

Create a Unit Take a look at mission in Visible Studio 2022

First off, let’s create Unit Take a look at mission in Visible Studio 2022 utilizing the xUnit Take a look at Undertaking template. Following these steps will create a brand new Unit Take a look at mission in Visible Studio 2022:

  1. Launch the Visible Studio 2022 IDE.
  2. Click on on “Create new mission.”
  3. Within the “Create new mission” window, choose “xUnit Take a look at Undertaking” from the checklist of templates displayed.
  4. Click on Subsequent.
  5. Within the “Configure your new mission” window, specify the identify and site for the brand new mission.
  6. Optionally verify the “Place resolution and mission in the identical listing” verify field, relying in your preferences.
  7. Click on Subsequent.
  8. Within the “Extra Data” window proven subsequent, choose .NET 6.0 because the goal framework from the drop-down checklist on the high. Go away the “Authentication Kind” as “None” (default).
  9. Make sure that the verify containers “Allow Docker,” “Configure for HTTPS,” and “Allow Open API Assist” are unchecked as we gained’t be utilizing any of these options right here.
  10. Click on Create.

This may create a brand new xUnit mission in Visible Studio 2022. We’ll use this mission within the subsequent sections of this text.

Create a Class Library mission in Visible Studio 2022

Let’s now create a category library mission in Visible Studio 2022. Following these steps will create a brand new class library mission in Visible Studio 2022:

  1. Launch the Visible Studio 2022 IDE.
  2. Click on on “Create new mission.”
  3. Within the “Create new mission” window, choose “Class Library” from the checklist of templates displayed.
  4. Click on Subsequent.
  5. Within the “Configure your new mission” window, specify the identify and site for the brand new mission.
  6. Click on Subsequent.
  7. Within the “Extra Data” window proven subsequent, choose .NET 6.0 because the goal framework from the drop-down checklist on the high.
  8. Click on Create.

This may create a brand new Class Library mission in Visible Studio 2022. We’ll use this mission within the subsequent sections of this text.

Create mannequin lessons in .NET 6

Let’s assume that the identify of the Class Library mission is Core.Infrastructure. Within the Answer Explorer window, select this mission after which click on “Add -> New Folder” so as to add a brand new resolution folder to the mission. Fashions ought to have the identical identify as their resolution folder.

Now create a category named BaseModel contained in the Fashions resolution folder and insert the next code:

public summary class BaseModel
    {
        public int Id { get; set; }
    }

Create two extra mannequin lessons named Product and Buyer. Every of those two lessons ought to prolong the BaseModel class as proven under.

public class Product: BaseModel
{
    public string Identify { get; set; }
    public decimal Worth { get; set; }
}
public class Buyer: BaseModel
{
    public string FirstName { get; set; }
    public string LastName { get; set; }
}

Create service lessons in .NET 6

Create one other resolution folder in the identical mission and identify it Companies. Create an interface named IBaseService inside this resolution folder and provides it the next code:

public interface IBaseService
{
    public void Initialize();
}

The Initialize technique should be applied by all lessons that implement this interface. The ProductService and CustomerService lessons implement the IBaseService interface as proven within the code snippet given under.

//ProductService.cs
utilizing Core.Infrastructure.Fashions;
namespace Core.Infrastructure.Companies
{
    public sealed class ProductService: IBaseService
    {
        public void Initialize()
        {
            //Write your implementation right here
        }
        public Checklist<Product> GetProducts()
        {
            return new Checklist<Product>();
        }
    }
}

//CustomerService.cs
utilizing Core.Infrastructure.Fashions;
namespace Core.Infrastructure.Companies
{
    public sealed class CustomerService: IBaseService
    {
        public void Initialize()
        {
            //Write your implementation right here
        }
        public Checklist<Buyer> GetCustomers()
        {
            return new Checklist<Buyer>();
        }
    }
}

Notice that, for the needs of this straightforward implementation, the Initialize technique of each the ProductService class and the CustomerService class has been left clean. You may write your personal implementation for these.

Set up the NetArchTest.Guidelines NuGet package deal

Thus far so good. Now add the NetArchTest.Guidelines NuGet package deal to your mission. To do that, choose the mission within the Answer Explorer window and right-click and choose “Handle NuGet Packages.” Within the NuGet Bundle Supervisor window, seek for the NetArchTest.Guidelines package deal and set up it.

Alternatively, you’ll be able to set up the package deal by way of the NuGet Bundle Supervisor console by coming into the road proven under.

PM> Set up-Bundle NetArchTest.Guidelines

Write structure unit assessments in .NET 6

Lastly, it’s best to write the structure unit assessments to verify if the supply code beneath take a look at conforms to your requirements. Notice that the time period “requirements” right here is relative, and you could assume that these requirements will probably be outlined by you.

The next take a look at technique verifies that your service lessons have a reputation with a Service suffix.

[Fact]
public void ServiceClassesShouldHaveNameEndingWithService()
{
    var consequence = Varieties.InCurrentDomain()
                 .That().ResideInNamespace(("Core.Infrastructure.Companies"))
                 .And().AreClasses()
                 .Ought to().HaveNameEndingWith("Service")
                 .GetResult();
    Assert.True(consequence.IsSuccessful);
}

You can have one other rule that verifies that your whole service lessons implement the IBaseService interface. The next take a look at technique illustrates how this may be achieved.

[Fact]
public void ServiceClassesShouldImplementIBaseServiceInterface()
{
   var consequence = Varieties.InCurrentDomain()
                .That().ResideInNamespace(("Core.Infrastructure.Companies"))
                .And().AreClasses()
                .Ought to().ImplementInterface(typeof(IBaseService))
                .GetResult();
   Assert.True(consequence.IsSuccessful);
}

You can even have a rule that verifies that the service lessons are public and never sealed. If these lessons are sealed, you gained’t be capable to prolong them additional.

[Fact]
public void ServiceClassesShouldBePublicAndNotSealed ()
{
    var consequence = Varieties.InCurrentDomain()
                .That().ResideInNamespace(("Core.Infrastructure.Companies"))
                .Ought to().BePublic().And().NotBeSealed()
                .GetResult();
    Assert.True(consequence.IsSuccessful);
}

While you run these take a look at strategies, it’s best to discover that every one of them move, i.e., they are going to be profitable. Strive altering the code and re-running the assessments to verify conformance to the foundations we mentioned.

netarchtest example IDG

The NetArchTest unit assessments in motion.

Do not forget that within the newer variations of C# you’ll be able to have a default implementation of members in an interface. So, if in case you have an interface that’s applied by a number of lessons, you’ll be able to write the default implementation within the interface. This holds true when you’re writing code that’s frequent throughout all implementations of the interface.

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