ArchUnitNET is a free, simple library for checking the architecture of C# code. It is the C# fork of https://www.archunit.org/ for Java. ArchUnitNET can check dependencies between classes, members, interfaces, and more. This is done by analyzing C# bytecode and importing all classes into our C# code structure. The main focus of ArchUnitNET is to automatically test architecture and coding rules.
To use ArchUnitNET, install the ArchUnitNET package from NuGet:
PS> Install-Package ArchUnitNET
If you want to use xUnit or NUnit for your unit tests, you should instead install the corresponding ArchUnit extension:
PS> Install-Package ArchUnitNET.xUnit
PS> Install-Package ArchUnitNET.NUnit
Then you will want to create a class to start testing. We used xUnit with the ArchUnit extension here, but it works similarly with NUnit or other Unit Test Frameworks.
using ArchUnitNET.Domain;
using ArchUnitNET.Loader;
using ArchUnitNET.Fluent;
using Xunit;
//add a using directive to ArchUnitNET.Fluent.ArchRuleDefinition to easily define ArchRules
using static ArchUnitNET.Fluent.ArchRuleDefinition;
namespace ExampleTest
{
public class ExampleArchUnitTest
{
// TIP: load your architecture once at the start to maximize performance of your tests
private static readonly Architecture Architecture =
new ArchLoader().LoadAssemblies(typeof(ExampleClass).Assembly, typeof(ForbiddenClass).Assembly)
.Build();
// replace <ExampleClass> and <ForbiddenClass> with classes from the assemblies you want to test
//declare variables you'll use throughout your tests up here
//use As() to give them a custom description
private readonly IObjectProvider<IType> ExampleLayer =
Types().That().ResideInAssembly("ExampleAssembly").As("Example Layer");
private readonly IObjectProvider<Class> ExampleClasses =
Classes().That().ImplementInterface("IExampleInterface").As("Example Classes");
private readonly IObjectProvider<IType> ForbiddenLayer =
Types().That().ResideInNamespace("ForbiddenNamespace").As("Forbidden Layer");
private readonly IObjectProvider<Interface> ForbiddenInterfaces =
Interfaces().That().HaveFullNameContaining("forbidden").As("Forbidden Interfaces");
//write some tests
[Fact]
public void TypesShouldBeInCorrectLayer()
{
//you can use the fluent API to write your own rules
IArchRule exampleClassesShouldBeInExampleLayer =
Classes().That().Are(ExampleClasses).Should().Be(ExampleLayer);
IArchRule forbiddenInterfacesShouldBeInForbiddenLayer =
Interfaces().That().Are(ForbiddenInterfaces).Should().Be(ForbiddenLayer);
//check if your architecture fulfils your rules
exampleClassesShouldBeInExampleLayer.Check(Architecture);
forbiddenInterfacesShouldBeInForbiddenLayer.Check(Architecture);
//you can also combine your rules
IArchRule combinedArchRule =
exampleClassesShouldBeInExampleLayer.And(forbiddenInterfacesShouldBeInForbiddenLayer);
combinedArchRule.Check(Architecture);
}
[Fact]
public void ExampleLayerShouldNotAccessForbiddenLayer()
{
//you can give your rules a custom reason, which is displayed when it fails
//(together with the types that failed the rule)
IArchRule exampleLayerShouldNotAccessForbiddenLayer = Types().That().Are(ExampleLayer).Should()
.NotDependOnAny(ForbiddenLayer).Because("it's forbidden");
exampleLayerShouldNotAccessForbiddenLayer.Check(Architecture);
}
[Fact]
public void ForbiddenClassesShouldHaveCorrectName()
{
Classes().That().AreAssignableTo(ForbiddenInterfaces).Should().HaveNameContaining("forbidden")
.Check(Architecture);
}
[Fact]
public void ExampleClassesShouldNotCallForbiddenMethods()
{
Classes().That().Are(ExampleClasses).Should().NotCallAny(
MethodMembers().That().AreDeclaredIn(ForbiddenLayer).Or().HaveNameContaining("forbidden"))
.Check(Architecture);
}
}
}Check out test examples for the current release at ArchUnitNET Examples.
ArchUnitNET is published under the Apache License 2.0. For more information concerning the license, see Apache License 2.0.