FluentAssertions.Microsoft.Extensions.DependencyInjection

This repository contains the Fluent Assertions extensions for Microsoft.Extensions.DependencyInjection.

• See www.fluentassertions.com for more information about the main library.

Quickstart

Install the NuGet package

PM> Install-Package FluentAssertions.Microsoft.Extensions.DependencyInjection

and start writing tests for your Microsoft.Extensions.DependencyInjection configuration.

Methods

.Should()
    .HaveCount(x) //check that the correct number of services has been registered in the IServiceCollection
    .HaveService<TService>(); //check that a service of TService is registered
    
.HaveService<TService>()
    .WithImplentation<SomeService>() //check if TService is registered with implentation, can be chained for multiple registrations
    .WithCount(int expected) //check if the correct number of TService's are registered, defualts to one if ommitted
    .AsSingleton() //assert that all services of TService are registered as Singleton 
    .AsScoped() //assert that all services of TService are registered as Scoped 
    .AsTransient() //assert that all services of TService are registered as Transient 

Example:

//general usage example
services.Should()
        .HaveService<ISomeService>()
        //Optional method to check if the collection contians the expected number of registrations
        //for the found service. .As(Lifetime)() will default to checking that there is only one service
        //registered if this method is ommitted
        .WithCount(2)
        //optional method to see if any of the registered services use the implentation, can be chained if 
        //more then one service is registered
        .WithImplentation<SomeService>()
        //checks that the registered service has the correct lifetime (Singleton, Scoped, Transient)
        //Will also ensure that there is only one service registered if the WithCount() operator is ommitted.
        //Can Chain with And() method
        .AsSingleton();

//check that service collection has Service And() HasCount(x) of total registered services
services.Should()
        .HaveService<ISomeService>()
        .AsTransient()
        .And()
        //assert that the correct number of services has been registered
        .HaveCount(4);