Soenneker.Utils.AutoBogus

The .NET Autogenerator

This project is an automatic creator and populator for the fake data generator Bogus. It's a replacement for the abandoned AutoBogus library.

The goals:

Be fast
Support the latest types in .NET

It uses the fastest .NET Reflection cache: soenneker.reflection.cache. Bogus updates are automatically integrated.

.NET 8+ is supported.

Installation

dotnet add package Soenneker.Utils.AutoBogus

Usage

Create an AutoFaker instance:

var optionalConfig = new AutoFakerConfig();
var autoFaker = new AutoFaker(optionalConfig);

Call Generate<>() on any type you want:

var randomWord = autoFaker.Generate<string>();
var dictionary = autoFaker.Generate<Dictionary<int, string>>();
var order = autoFaker.Generate<Order>();

It's also possible to generate types via an argument:

var randomWord = autoFaker.Generate(typeof(string));

Set a faker, configuration, rules, etc:

autoFaker.Config.Faker = new Faker("de");
autoFaker.Config.RepeatCount = 3;
...

`AutoFakerOverride`

This is the recommended way for controlling type customization:

public class OrderOverride : AutoFakerOverride<Order>
{
    public override void Generate(AutoFakerOverrideContext context)
    {
        var target = (context.Instance as Order)!;
        target.Id = 123;
        
        // Faker is available
        target.Name = context.Faker.Random.Word();

        // AutoFaker is also available
        target.Customer = context.AutoFaker.Generate<Customer>();
     }
}

Then just add AutoFakerOverride to the AutoFaker.Config instance:

autoFaker.Config.Overrides = new List<AutoFakerGeneratorOverride>();
autoFaker.Config.Overrides.Add(new OrderOverride());

`AutoFaker<T>`

This inherits from Bogus.Faker, and can be used to designate rules specific to the AutoFaker instance.

var autoFaker = new AutoFaker<Order>();
autoFaker.RuleFor(x => x.Id, f => f.Random.Number());
var order = autoFaker.Generate();

Interfaces/Abstracts

The base library does not generate interfaces or abstract objects, but these enable you to generate mocks of them:

soenneker.utils.autobogus.moq
soenneker.utils.autobogus.nsubstitute
soenneker.utils.autobogus.fakeiteasy

Tips

⚠️ Instantiating an AutoFaker takes a non-trivial amount of time because of Bogus Faker initialization (almost 1ms). It's recommended that a single instance be used if possible.
AutoFaker.GenerateStatic<T>() is also available, but should be avoided (as it creates a new AutoFaker/Faker on each call).

Notes

Some patterns that existed in AutoBogus have been removed due to the complexity and performance impact.
This is a work in progress. Contribution is welcomed.

Benchmarks