[Feature Request] Add a `WithFactoryMethod` option to IFakeOptions

Currently, I have classes with a factory creation method instead of a public constructor and I can’t fake them.

What would you guys think of a new method to handle the creation with the factory method vs a constructor?

For example, say I have a class like this.

public class Recipe : BaseEntity
{
    public string Title { get; private set; }
    public string Directions { get; private set; }
    public int? Rating { get; private set; }
    public Author Author { get; private set; }
    public ICollection<Ingredient> Ingredients { get; private set; }

    public static Recipe Create(RecipeForCreationDto recipeForCreationDto)
    {
        new RecipeForCreationDtoValidator().ValidateAndThrow(recipeForCreationDto);
        var mapper = new Mapper(new MapperConfiguration(cfg => {
            cfg.AddProfile<RecipeProfile>();
        }));
        var newRecipe = mapper.Map<Recipe>(recipeForCreationDto);
        newRecipe.QueueDomainEvent(new RecipeCreated(){ Recipe = newRecipe });
        
        return newRecipe;
    }
        
    public void Update(RecipeForUpdateDto recipeForUpdateDto)
    {
        new RecipeForUpdateDtoValidator().ValidateAndThrow(recipeForUpdateDto);
        var mapper = new Mapper(new MapperConfiguration(cfg => {
            cfg.AddProfile<RecipeProfile>();
        }));
        mapper.Map(recipeForUpdateDto, this);
        QueueDomainEvent(new RecipeUpdated(){ Recipe = this });
    }
    
    private Recipe() { } // For EF
}

I could then create a fake for it it like this:

RecipeForCreationDto fakeDto = new FakeRecipeForCreationDto();
var fakeTracking = A.Fake<Reccipe>(x => 
            x.WithFactoryMethod(x => x.Create(fakeDto)));

Totally open to other APIs, but this is a gap in the current API that is making things hard for this use case.

Happy to make a contribution if you guys aren’t up for it, but I haven’t looked at your codebase at all yet, so any guidance would be appreciated!

[pdevito3]

Awesome. Thanks for the help!

[blairconrad]

No, Moq and NSubstitute would have about the same powers as FakeItEasy. We all build on the same base.

I was thinking of something like Isolator, which I used a very long time ago, and I think there’s another. Oh! JustMock. I’ve never used that one. There may be others…