A toolkit of support libraries and Ruby core extensions extracted from the Rails framework. Rich support for multibyte strings, internationalization, time zones, and testing.

minitest provides a complete suite of testing facilities supporting TDD, BDD, and benchmarking. "I had a class with Jim Weirich on testing last week and we were allowed to choose our testing frameworks. Kirk Haines and I were paired up and we cracked open the code for a few test ...

A toolkit for building modeling frameworks like Active Record. Rich support for attributes, callbacks, validations, serialization, internationalization, and testing.

Databases on Rails. Build a persistent domain model by mapping database tables to Ruby classes. Strong conventions for associations, validations, aggregations, migrations, and testing come baked-in.

Web apps on Rails. Simple, battle-tested conventions for building and testing MVC web applications. Works with any Rack-compatible server.

Rack::Test is a small, simple testing API for Rack apps. It can be used on its own or as a reusable starting point for Web frameworks and testing libraries to build on.

This gem can compare doms and assert certain elements exists in doms using Nokogiri.

rspec-rails integrates the Rails testing helpers into RSpec.

Capybara is an integration testing tool for rack based web applications. It simulates how a user would interact with a website

Selenium implements the W3C WebDriver protocol to automate popular browsers. It aims to mimic the behaviour of a real user as it interacts with the application's HTML. It's primarily intended for web application testing, but any web-based task can automated.

Strategies for cleaning databases. Can be used to ensure a clean slate for testing.

Extracting `assigns` and `assert_template` from ActionDispatch.

Extension of Ruby’s standard Logger for advanced, structured logging. Includes log entry attributes, context isolation, customizable formatters, flexible output devices, and testing tools.

Helps creating valid Guard plugins and testing them

Strategies for cleaning databases using ActiveRecord. Can be used to ensure a clean state for testing.

Strategies for cleaning databases. Can be used to ensure a clean slate for testing.

test-unit (Test::Unit) is unit testing framework for Ruby, based on xUnit principles. These were originally designed by Kent Beck, creator of extreme programming software development methodology, for Smalltalk's SUnit. It allows writing tests, checking results and automated testing in Ruby.

Rugged is a Ruby bindings to the libgit2 linkable C Git library. This is for testing and using the libgit2 library in a language that is awesome.

Power Assert shows each value of variables and method calls in the expression. It is useful for testing, providing which value wasn't correct when the condition is not satisfied.

Simple testing of Sidekiq jobs via a collection of matchers and helpers