thoughtbot/factory_bot

Health v2 · maintenance only

Adoption not part of the score

8169 stars · 2552 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

factory_bot is a Ruby library for defining and building test data objects with a straightforward factory definition syntax. It supports multiple build strategies (saved instances, unsaved instances, attribute hashes, stubbed objects), multiple factories per class, and factory inheritance, serving as a fixtures replacement.

Use cases

• generate test data for ruby tests
• replace rails fixtures with factories
• create test objects with associations in rspec
• define reusable factories with traits and inheritance
• set up test records for rails integration tests
• stub objects in unit tests without hitting the database

When to choose

• you write Ruby or Rails tests and need flexible, maintainable test data setup
• you want a fixtures replacement with build strategies like stubs and unsaved instances
• you need factory inheritance, traits, and multiple factories per class
• you use RSpec, Minitest, or Rails test suites

When to avoid

• you are not working in Ruby or a Ruby-based framework
• you prefer plain fixtures, seeds, or hand-rolled test data builders
• you need test data generation for non-Ruby languages

Facets

library · maturity stable

testing mocking data-generation testing web-development developer-tools ruby jvm fixtures-replacement test-data factories rails rspec factory-girl

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