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

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.

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

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

An object-oriented testing framework

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.

A Ruby library for controlling Toxiproxy. Can be used in resiliency testing.

CasperJS is a navigation scripting & testing utility for [PhantomJS](http://www.phantomjs.org/). It eases the process of defining a full navigation scenario and provides useful high-level functions, methods & syntaxic sugar for doing common tasks.

Command line tool for installing EarlGrey into an iOS Unit Testing target

Capybara aims to simplify the process of integration testing Rack applications, such as Rails, Sinatra or Merb. It is inspired by and aims to replace Webrat as a DSL for interacting with a webapplication. It is agnostic about the driver running your tests and currently comes bundled with rack-test, Culerity, Celerity and Selenium support built in.

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

Capybara aims to simplify the process of integration testing Rack applications, such as Rails, Sinatra or Merb. It is inspired by and aims to replace Webrat as a DSL for interacting with a webapplication. It is agnostic about the driver running your tests and currently comes bundled with rack-test, Culerity, Celerity and Selenium support built in.

Puppet's accceptance testing harness

InSpec provides a framework for creating end-to-end infrastructure tests. You can use it for integration or even compliance testing. Create fully portable test profiles and use them in your workflow to ensure stability and security. Integrate InSpec in your change lifecycle for local testing, CI/CD, and deployment verification. Packaged distributions of Progress® Chef® products obtained from RubyGems are made available pursuant to the Progress Chef EULA at https://www.chef.io/end-user-license-agreement, unless there is an executed agreement in effect between you and Progress that covers the Progress Chef products ("Master Agreement"), in which case the Master Agreement shall govern. Source code obtained from the Chef GitHub repository is made available under Apache-2.0, a copy of which is included.

InSpec provides a framework for creating end-to-end infrastructure tests. You can use it for integration or even compliance testing. Create fully portable test profiles and use them in your workflow to ensure stability and security. Integrate InSpec in your change lifecycle for local testing, CI/CD, and deployment verification. This has local support only. See the `inspec` gem for full support. Packaged distributions of Progress® Chef® products obtained from RubyGems are made available pursuant to the Progress Chef EULA at https://www.chef.io/end-user-license-agreement, unless there is an executed agreement in effect between you and Progress that covers the Progress Chef products ("Master Agreement"), in which case the Master Agreement shall govern. Source code obtained from the Chef GitHub repository is made available under Apache-2.0, a copy of which is included.

Puppetlabs testing tool coupled with Beaker

For use for the Beaker acceptance testing tool

NUnit is a unit-testing framework for all .Net languages. Initially ported from JUnit, the current production release, version 2.5, is the sixth major release of this xUnit based unit testing tool for Microsoft .NET. It is written entirely in C# and has been completely redesigned to take advantage of many .NET language features, for example custom attributes and other reflection related capabilities. NUnit brings xUnit to all .NET languages.

Service stub for the Heroku API. Will respond to all public endpoints of the Heroku API with a sample serialized response representing what data that endpoint would normal return. Useful in development and testing situations where real API calls might result in inconvienent manipulation of real data.

Test Kitchen is an integration tool for developing and testing infrastructure code and software on isolated target platforms.