I have been manually instantiating my services in my integration tests, but when I got to a serve that had Lazy dependencies, I did some research and found that you can actually use Autofac to resolve your services when doing your tests.
So, I wrote this class:
public class Container<TModule> where TModule: IModule, new()
{
private readonly IContainer _container;
protected Container()
{
var builder = new ContainerBuilder();
builder.RegisterModule(new TModule());
_container = builder.Build();
}
protected TEntity Resolve<TEntity>() => _container.Resolve<TEntity>();
protected void Dispose() => _container.Dispose();
}
And then in my context, I changed to this:
public class ProductContext : Container<AutofacModule>
{
public IProductProvider ProductProvider { get; }
public static ProductContext GiventServices() => new ProductContext();
protected ProductContext()
{
ProductProvider = Resolve<IProductProvider>();
}
public List<JObject> WhenListProducts(int categoryId) => ProductProvider.List(categoryId);
}
I have another context that seems to work (the tests pass) and that is using a MatchProvider. If I compare both in my Autofac module, they look like this:
builder.RegisterType<ProductProvider>().As<IProductProvider>().InstancePerRequest();
and
builder.RegisterType<MatchProvider>().As<IMatchProvider>().SingleInstance();
Because the MatchProvider is a singelton, it seems to have no issues being resolved, but the ProductProvider is an instance per request, this is where the issue seems to lie.
I get this error when running any tests that require that service:
No scope with a tag matching 'AutofacWebRequest' is visible from the scope in which the instance was requested.
I figured it was because I didn't have the right nuget packages installed. So I installed:
These are the same references that are used where my module is defined, but this did not help. Does anyone know what I need to do to get this to work?
I couldn't find a suitable (easy) solution to this. I saw some people creating lifetime scopes themselves, which to me seemed like overkill and it wasn't "nice" code. So, taking one of Autofac's principles: Any service that is registered multiple times; the last instance is the instance that is resolved.
So in my Container class, I just re-registered my InstancePerRequest services as InstancePerDependency instead. This solved my issue.
Here is my full code:
public class ContainerContext<TModule> where TModule: IModule, new()
{
private IContainer _container;
protected ContainerContext()
{
var builder = new ContainerBuilder();
builder.RegisterModule(new TModule());
// Because Autofac will resolve services using the last registration, we can change all our web api
// services to by InstancePerDependency instead of InstancePerRequest which is obviously better
// when testing.
builder.RegisterType<AnswerProvider>().As<IAnswerProvider>().InstancePerDependency();
builder.RegisterType<AttributeProvider>().As<IAttributeProvider>().InstancePerDependency();
builder.RegisterType<CategoryProvider>().As<ICategoryProvider>().InstancePerDependency();
builder.RegisterType<ClaimProvider>().As<IClaimProvider>().InstancePerDependency();
builder.RegisterType<ClientProvider>().As<IClientProvider>().InstancePerDependency();
builder.RegisterType<CriteriaProvider>().As<ICriteriaProvider>().InstancePerDependency();
builder.RegisterType<FeedProvider>().As<IFeedProvider>().InstancePerDependency();
builder.RegisterType<FormulaProvider>().As<IFormulaProvider>().InstancePerDependency();
builder.RegisterType<ImageProvider>().As<IImageProvider>().InstancePerDependency();
builder.RegisterType<GroupProvider>().As<IGroupProvider>().InstancePerDependency();
builder.RegisterType<QuestionProvider>().As<IQuestionProvider>().InstancePerDependency();
builder.RegisterType<StripeProvider>().As<IStripeProvider>().InstancePerDependency();
builder.RegisterType<ApiAiProvider>().As<IApiAiProvider>().InstancePerDependency();
builder.RegisterType<PiiikProvider>().As<IPiiikProvider>().InstancePerDependency();
builder.RegisterType<ProductProvider>().As<IProductProvider>().InstancePerDependency();
builder.RegisterType<SettingProvider>().As<ISettingProvider>().InstancePerDependency();
builder.RegisterType<TrackingProvider>().As<ITrackingProvider>().InstancePerDependency();
_container = builder.Build();
}
protected TEntity Resolve<TEntity>() => _container.Resolve<TEntity>();
protected void Dispose() => _container.Dispose();
}
And then, any context I use inherits this class:
public class ProductContext : ContainerContext<AutofacModule>
{
public IProductProvider ProductProvider { get; }
public static ProductContext GiventServices() => new ProductContext();
protected ProductContext()
{
ProductProvider = Resolve<IProductProvider>();
}
public List<JObject> WhenListProducts(int categoryId) => ProductProvider.List(categoryId);
}
Which means, when testing, I can just do this:
[TestFixture]
public class ProductProviderTests
{
[Test]
public void ShouldHaveProducts()
{
var services = ProductContext.GiventServices();
var products = services.WhenListProducts(1);
products.Count.Should().NotBe(0);
}
[Test]
public void ShouldHaveDuplicateVariants()
{
var services = ProductContext.GiventServices();
var products = services.WhenListProducts(1);
var anyDuplicate = products.GroupBy(x => x.SelectToken("variant").ToString()).Any(g => g.Count() > 1);
anyDuplicate.Should().Be(true);
}
[Test]
public void ShouldNotHaveDuplicateGtins()
{
var services = ProductContext.GiventServices();
var products = services.WhenListProducts(1);
var anyDuplicate = products.GroupBy(x => x.SelectToken("gtin").ToString()).Any(g => g.Count() > 1);
anyDuplicate.Should().Be(false);
}
}
This should help anyone else having the same issue.