Using a rule for a specific property when building a class

Hi.

Is it possible to make AutoFixture randomly pick one element in a predefined list (or an array) for a specific property? Something like:

public class SomeClass
{
    public char SomeProperty { get; set; }
    ...
}

fixture.Build<SomeClass>()
    .With(cls => cls.SomeProperty, [SomeKindOfARandomlyPicker](new char[]{ 'S', 'N' }))
    .Create();

Thanks.

[crenan]

.With(p => p.Property1, (Generator<char> generator) => generator.Where(c => validChars.Contains©).First())

@Kralizek Thank you. It’s ugly but works 😄 .

As for the hint for @zvirja, the first thing I tried was using the ElementsBuilder<char>('N','S'), but I was getting the exception you mentioned, so I went to check the code and saw that it’s not possible to use an ISpecimenBuilder.

It would be a good thing the possibility to use an ISpecimenBuilder for a specific property, like

.With(p => p.MyProperty, new SpecimenBuilder(....))

so AF could use it to generate values in the post-processing.

[Kralizek]

@crenan Sorry, you are right. I could only find a workaround to get to work.

char[] validChars = new char[]{'Y', 'N'};

Fixture fixture = new Fixture();

var test = fixture.Build<TestClass>()
			.With(p => p.Property1, (Generator<char> generator) => generator.Where(c => validChars.Contains(c)).First())
			.Create();

It’s not clean but it works.