testland/synthetic-data-tool-selector
Chooses between the four mainstream synthetic test-data generators - Faker (JavaScript), FactoryBot (Ruby), mimesis (Python), Bogus (.NET) - picks the right tool by language and use case (raw value generation vs. typed factory orchestration), shows side-by-side equivalents for the same fixture across all four, and emits the language-appropriate code. Use when starting test-data work on a project and the team wants the "which tool should I use" decision documented.
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language-variants.mdreferences/
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)...;
}