AutoFixture, create a list of email addresses

Question

I'm writing some unit tests and have a class called Account which has

public Guid AccountId {get;set;}
public IEnumerable<string> EmailAddresses {get;set;}
etc...

I want to use autofixture to create the account, but I'm having trouble getting the email format.

I have tried

fixture.Register<string>(() => string.Format("{0}@acme.com", fixture.Create<string>()));

but that that leads to circular problem.

I could do this

fixture.Register<string>(() => string.Format("{0}@acme.com", fixture.Create<int>()));

But I'd rather have a string at the start of the address.

EDIT Thanks to both answers I have a written up a summary and few other scenarios as a post here - http://nodogmablog.bryanhogan.net/2016/04/customizing-a-specific-string-inside-a-class-using-autofixture/

Answer 1

There are a couple of ways of doing that. Here's one of them:

Assuming that MyClass is defined as

public class MyClass
{
    public Guid AccountId { get; set; }
    public IEnumerable<string> EmailAddresses { get; set; }
}

Then, a Fixture object can be customized like so

var fixture = new Fixture();
fixture.Customize<MyClass>(c => c
    .With(x =>
        x.EmailAddresses,
        fixture.CreateMany<MailAddress>().Select(x => x.Address)));

var result = fixture.Create<MyClass>();

And so the EmailAddresses will be filled with email strings that look like:

"[email protected]"
"[email protected]"
"[email protected]"