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testland/synthetic-data-toolkit

Use whenever someone asks for test factories or a FactoryBot setup, even a quick one: factories with traits and associations (Ruby, Rails), Mimesis bulk data (Python), Bogus Faker<T> builders (.NET), or which generator fits. Same fixture in each tool; plain fake values stay with faker-data.

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Same fixture across four languages, plus per-test reset

Generate a single user with name + email + a date of birth in [1980, 2000]. The pattern is identical across libraries; only the API style differs (method calls vs. RuleFor builders). The Python (Faker) canonical version is inline in SKILL.md.

Python (mimesis)

from mimesis import Generic, Locale

g = Generic(Locale.EN, seed=42)

user = {
    "name":  g.person.full_name(),
    "email": g.person.email(),
    "dob":   g.datetime.date(start=1980, end=2000),
}

JS / TS (faker-js)

import { faker } from '@faker-js/faker';

faker.seed(42);

const user = {
  name:  faker.person.fullName(),
  email: faker.internet.email(),
  dob:   faker.date.birthdate({ min: 23, max: 43, mode: 'age' }),
};

Ruby (FactoryBot + Faker)

FactoryBot.define do
  factory :user do
    name  { Faker::Name.name }
    email { Faker::Internet.unique.email }
    dob   { Faker::Date.birthday(min_age: 23, max_age: 43) }
  end
end

# Use:
Faker::Config.random = Random.new(42)
user = FactoryBot.create(:user)

.NET (Bogus)

var faker = new Faker<User>("en")
    .UseSeed(42)
    .RuleFor(u => u.Name,  f => f.Name.FullName())
    .RuleFor(u => u.Email, f => f.Internet.Email())
    .RuleFor(u => u.Dob,   f => f.Date.Past(43));

var user = faker.Generate();

Per-test resetting

Reset the seed in beforeEach (Vitest / Jest / pytest / RSpec) so each test starts with the same baseline:

import { faker } from '@faker-js/faker';

beforeEach(() => { faker.seed(42); });

@pytest.fixture(autouse=True)
def reset_faker():
    Faker.seed(42)

RSpec.configure do |c|
  c.before(:each) do
    Faker::Config.random = Random.new(42)
  end
end

// xUnit fixture or per-test setup
[Fact]
public void Test()
{
    var faker = new Faker<User>().UseSeed(42)...;
}

.tessl-plugin

references