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Xunit Dependency Injection framework - .NET 9.0

Xunit does not support any built-in dependency injection features, therefore developers have to come up with a solution to recruit their favourite dependency injection framework in their tests.

This library brings in Microsoft’s dependency injection container to Xunit by leveraging Xunit’s fixture.

Getting started

Nuget package

First add the following nuget package to your Xunit project:

Install-Package Xunit.Microsoft.DependencyInjection

Setup your fixture

The abstract class of Xunit.Microsoft.DependencyInjection.Abstracts.TestBedFixture contains the necessary functionalities to add services and configurations to Microsoft’s dependency injection container. Your concrete test fixture class must derive from this abstract class and implement the following two abstract methods:

protected abstract IEnumerable<string> GetConfigurationFiles();
protected abstract void AddServices(IServiceCollection services, IConfiguration configuration);

GetConfigurationFiles(...) method returns a collection of the configuration files in your Xunit test project to the framework. AddServices(...) method must be used to wire up the implemented services.

Secret manager

Secret manage is a great tool to store credentials, api keys and other secret information for development purpose. This library has started supporting user secrets from version 8.2.0 onwards. To utilize user secrets in your tests, simply override the virtual method below from TestBedFixture class:

protected override void AddUserSecrets(IConfigurationBuilder configurationBuilder);

Access the wired up services

There are two method that you can use to access the wired up service depending on your context:

public T GetScopedService<T>(ITestOutputHelper testOutputHelper);
public T GetService<T>(ITestOutputHelper testOutputHelper);

To access async scopes simply call the following method in the abstract fixture class:

public AsyncServiceScope GetAsyncScope<T>(ITestOutputHelper testOutputHelper)

Accessing the keyed wired up services in .NET 8.0

You can call the following method to access the keyed already-wired up services:

T? GetKeyedService<T>([DisallowNull] string key, ITestOutputHelper testOutputHelper);

Adding custom logging provider

Test developers can add their own desired logger provider by overriding AddLoggingProvider(...) virtual method defined in TestBedFixture class.

Preparing Xunit test classes

Your Xunit test class must be derived from Xunit.Microsoft.DependencyInjection.Abstracts.TestBed<T> class where T should be your fixture class derived from TestBedFixture.

Also, the test class should be decorated by the following attribute:

[CollectionDefinition("Dependency Injection")]

Clearing managed resources

To have managed resources cleaned up, simply override the virtual method of Clear(). This is an optional step.

Clearing managed resourced asynchronously

Simply override the virtual method of DisposeAsyncCore() for this purpose. This is also an optional step.

Running tests in order

The library also has a bonus feature that simplifies running tests in order. The test class does not have to be derived from TestBed<T> class though and it can apply to all Xunit classes.

Decorate your Xunit test class with the following attribute and associate TestOrder(...) with Fact and Theory:

[TestCaseOrderer("Xunit.Microsoft.DependencyInjection.TestsOrder.TestPriorityOrderer", "Xunit.Microsoft.DependencyInjection")]

Supporting configuration from UserSecrets

This library’s TestBedFixture abstract class exposes an instance of IConfigurationBuilder that can be used to support UserSecrets when configuring the test projects:

public IConfigurationBuilder ConfigurationBuilder { get; private set; }

Examples

One more thing

Do not forget to include the following nuget packages to your Xunit project: