bUnit and AutoFixture with Moq

[thopdev]

AutoFixture allows you to automatically create objects with random, Mocks etc.. values.

Last week I tried using bUnit in combination with AutoFixture but i got a exception when let AutoFixture generate the TestContext.
System.InvalidOperationException: 'Services cannot be added to provider after it has been initialized.'

Now i still wanted to use AutoFixture so i went into a little deeper into it to it.
AutoFixture allows to customize certain objects so i took a advanced of that and when a certain mock is requested it automatically inserts it into the dependency container from bUnit. I used the following code.

AddServiceCustomization

public class AddServiceCustomization<T> : ICustomization where T : class
{
   public void Customize(IFixture fixture)
   {
      fixture.Customize<Mock<T>>(c => 
        c.Do(m => 
           fixture.Freeze<TestContext>().Services.AddSingleton(m.Object)
        ));
    }
}

AddAllServicesCustomization

public class AddAllServicesCustomization : ICustomization
{
    public void Customize(IFixture fixture)
    {
        fixture.Customize(new AddServiceCustomization<ILoaderItemFactory>());
    }
}

AutoMoq Data attribute

public class AutoMoqDataAttribute : AutoDataAttribute
{
    public AutoMoqDataAttribute() : base(() => 
        new Fixture()
            .Customize(new AutoMoqCustomization())
            .Customize(new AddAllServicesCustomization()))
    {

    }
}

Example test

[Theory]
[InlineDomainData]
public void LoaderWithoutUsername(string name, string uri, Mock<ILoaderItemFactory> loaderItemFactory, TestContext context)
{
    loaderItemFactory.Setup(x => x.CreateRandomItem()).Returns(new LoaderItem(name, uri));

    var loaderComponent = context.RenderComponent<LoaderComponent>();

    var spans = loaderComponent.FindAll("span");

    var nameSpan = Assert.Single(spans);
    Assert.Equal(name, nameSpan.TextContent);
}

If you have any other questions, suggestions or other approaches please let me know.

[egil]

Thanks for sharing @thopdev. I am getting the hang of AutoFixture myself at work, so its nice to see that it works well with bUnit as well.

What is the InlineDomainData attribute?

[thopdev]

O yhee sorry. just allows to use the moq for inline moq data

    public class InlineDomainDataAttribute : InlineAutoDataAttribute
    {
        public InlineDomainDataAttribute(params object[] values) : base(new AutoMoqDataAttribute(), values)
        {
        }
    }