XUnit Test with autofac

Question

I followed this link https://github.com/dennisroche/xunit.ioc.autofac to create XUnit Test with autofac, but I got error

The requested service 'Xunit.Sdk.TestOutputHelper' has not been registered. To avoid this exception, either register a component to provide the service, check for service registration using IsRegistered(), or use the ResolveOptional() method to resolve an optional dependency. I have added below code:

        builder.Register(context => new TestOutputHelper())
            .As<ITestOutputHelper>()
            .InstancePerLifetimeScope();

Did I miss anything from above link?

Peter Wurzinger · Accepted Answer · 2017-04-27T09:37:54.383

TL;DR:

Make sure to register the type TestOutputHelper also as self when using this library.

Longer version:

The AutofacTestInvoker (https://github.com/dennisroche/xunit.ioc.autofac/blob/master/src/xunit2.ioc.autofac/AutofacTestInvoker.cs) needs the concrete class TestOutputHelper (not ITestOutputHelper!) to call TestOutputHelper.Initialize(IMessageBus, ITest), which is not available in the Interface, and resolves it via the created ILifetimeScope. In your example you register it as it's interface, so for Autofac there is no TestOutputHelper available to resolve at all.

EDIT: The documentation has been adapted. See https://github.com/dennisroche/xunit.ioc.autofac/pull/9 for details.

I registered it as ` builder.RegisterType().AsSelf().As().InstancePerLifetimeScope();` — Edward, Apr 20 '17 at 13:28

score 0 · Answer 2 · answered Apr 18 '17 at 14:48

0

You are registering ITestOutputHelper, not TestOutputHelper and it seems that the later is required by some constructor.

If you are using TestOutputHelper in some test you should replace it with ITestOutputHelper.

answered Apr 18 '17 at 14:48

DaniCE

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I did not use TestOutputHelper, I used ITestOutputHelper, it seems there is somewhere in the library uses TestOutputHelper – Edward Apr 20 '17 at 13:29

XUnit Test with autofac

2 Answers2