Spock is a testing and specification framework for Java and Groovy applications. It is compatible with most IDEs, build tools, and continuous integration servers. It is beautiful and highly expressive specification language.

Spock - Testing and Specification Framework for Java and Groovy

Selenium is a suite of tools such as Selenium IDE, Selenium Remote Control and Selenium Grid to test the web application. Selenium IDE is an integrated development environment for Selenium scripts. It is implemented as a Firefox extension, and allows you to record, edit, and debug tests. It supports record and playback. 
 Selenium Remote Control (RC) is a test tool that allows you to write automated web application UI tests in any programming language against any HTTP website using any mainstream JavaScript-enabled browser. It is great for testing complex AJAX-based web user interfaces under a Continuous Integration system. Selenium Grid transparently distribute your tests on multiple machines so that you can run your tests in parallel. <img src="/AppImages/Article/selenium-ide.gif" alt="" class="float-center">

Selenium is a suite of tools such as Selenium IDE, Selenium Remote Control and Selenium Grid to test the web application. Selenium IDE is an integrated development environment for Selenium scripts. It is implemented as a Firefox extension, and allows you to record, edit, and debug tests. It supports record and playback.

Selenium - Web app testing tool

Mechanize provides Stateful Programmatic Web Browser. It supports HTML form filling, Custom headers, HTTP authentication, SSL support etc. 
 GitHub: <A HREF="https://github.com/jjlee/mechanize" target="_blank">https://github.com/jjlee/mechanize</A>

Mechanize provides Stateful Programmatic Web Browser. It supports HTML form filling, Custom headers, HTTP authentication, SSL support etc.

Mechanize - Stateful Programmatic Web Browsing in Python

Jasmine is a Behavior Driven Development testing framework for JavaScript. It does not rely on browsers, DOM, or any JavaScript framework. Thus it's suited for websites, Node.js projects, or anywhere that JavaScript can run.

Jasmine - A JavaScript Testing Framework

MailCatcher runs a super simple SMTP server which catches any message sent to it to display in a web interface. Run mailcatcher, set your favourite app to deliver to smtp://127.0.0.1:1025 instead of your default SMTP server, then check out http://127.0.0.1:1080 to see the mail that's arrived so far.

MailCatcher - Catches mail and serves it through a dream

Shouldly is an assertion framework which focuses on giving great error messages when the assertion fails while being simple and terse.Shouldly uses the code before the ShouldBe statement to report on errors, which makes diagnosing easier.

Shouldly - Should testing for .NET - the way Asserting *Should* be!

CodeceptJS is a new testing framework for end-to-end testing with WebDriver (or others). It abstracts browser interaction to simple steps that are written from a user perspective. It is synchronous where you don't need to care about callbacks, or promises, test scenarios are linear. 
Run your tests via Playwright, WebDriver, Puppeteer, TestCafe, Protractor, Appium. The code is the same.
<ul>
<li>Based on <a href="https://mochajs.org/" rel="nofollow">Mocha</a> testing framework.</li>
<li>Designed for scenario driven acceptance testing in BDD-style</li>
<li>Uses ES6 natively without transpiler.</li>
<li>Also plays nice with TypeScript.</li>
<li>Smart locators: use names, labels, matching text, CSS or XPath to locate elements.</li>
<li>Interactive debugging shell: pause test at any point and try different commands in a browser.</li>
<li>Easily create tests, pageobjects, stepobjects with CLI generators.</li>
</ul>

CodeceptJS is a new testing framework for end-to-end testing with WebDriver (or others). It abstracts browser interaction to simple steps that are written from a user perspective. It is synchronous where you don't need to care about callbacks, or promises, test scenarios are linear. 
Run your tests via Playwright, WebDriver, Puppeteer, TestCafe, Protractor, Appium. The code is the same.

CodeceptJS - Supercharged End 2 End Testing Framework for NodeJS

FitNesse is a lightweight, open-source framework that makes it easy for software teams to collaboratively define Acceptance Tests. In FitNesse, tests are expressed as tables of input data and expected output data. FitNesse is a wiki web server, the test cases are created by editing the wiki pages.

Fitnesse - Software Testing Tool

Arquillian is an innovative and highly extensible testing platform for the JVM that enables developers to easily create automated integration, functional and acceptance tests for Java middleware. Arquillian handles all the plumbing of container management, deployment and framework initialization so you can focus on the task at hand, writing your tests. Real tests.
 
Arquillian provides a component model for integration tests, which includes dependency injection and container life cycle management. Instead of managing a runtime in your test, Arquillian brings your test to the runtime.

Arquillian is an innovative and highly extensible testing platform for the JVM that enables developers to easily create automated integration, functional and acceptance tests for Java middleware. Arquillian handles all the plumbing of container management, deployment and framework initialization so you can focus on the task at hand, writing your tests. Real tests. 

Arquillian - Testing Platform for JVM

Japa is an API-first testing framework. It focuses only on testing Node.js (backend) applications, thus resulting in a fast, small, and simple tests runner. 
<ul>
<li>Support for <a href="https://japa.dev/grouping-tests" rel="nofollow">test groups</a>, timeout, todo tests and <a href="https://japa.dev/underlying-test-class#fails" rel="nofollow">regression tests</a>.</li>
<li>Support for <a href="https://japa.dev/datasets" rel="nofollow">Datasets</a>.</li>
<li>Assertion libraries with support for <a href="https://japa.dev/assertion-planning" rel="nofollow">assertion planning</a>.</li>
<li>Ability to <a href="https://japa.dev/filtering-tests" rel="nofollow">filter</a> and run specific or only failing tests.</li>
<li>Re-imagined <a href="https://japa.dev/lifecycle-hooks" rel="nofollow">lifecycle hooks</a>.</li>
<li>Multiple <a href="https://japa.dev/plugins/spec-reporter" rel="nofollow">reporters</a> to display tests progress.</li>
<li>Great CLI experience with pretty diffs and formatted error stacks.</li>
<li>Works with ESM and <a href="https://japa.dev/usage-with-typescript" rel="nofollow">TypeScript</a> both with zero additional setup.</li>
</ul>

Japa is an API-first testing framework. It focuses only on testing Node.js (backend) applications, thus resulting in a fast, small, and simple tests runner. 

Japa - API-first testing framework

Windmill is a web testing tool designed to automate and debug your web application. It provides cross-browser test recorder. It has built-in shell to interact with WIndmill server. Write and run tests from Python, Ruby and Javascript. 
 Github location: <A HREF="https://github.com/windmill/windmill/" target="_blank">https://github.com/windmill/windmill/</A>

Windmill is a web testing tool designed to automate and debug your web application. It provides cross-browser test recorder. It has built-in shell to interact with WIndmill server. Write and run tests from Python, Ruby and Javascript.

Windmill - Web Testing Tool

Alfajor provides a modern, object-oriented and browser-neutral interface to HTTP resources. Python scripts and test code have a live synchronized mirror of the browser's X/HTML DOM, even with DOM changes made on the client by JavaScript. It has an Api client with native JSON response support useful for testing REST and web API.

Alfajor - Tasty functional testing

GreenMail is an open source, intuitive and easy-to-use test suite of email servers for testing purposes. Supports SMTP, POP3, IMAP with SSL socket support. GreenMail also provides a JBoss GreenMail Service. GreenMail is the first and only library that offers a test framework for both receiving and retrieving emails from Java.

greenmail - Official master for the Greenmail project

Splinter is an open source tool for testing web applications using Python. It lets you automate browser actions, such as visiting URLs and interacting with their items. Splinter is an abstraction layer on top of existing browser automation tools such as Selenium, PhantomJS and zope.testbrowser. It has a high-level API that makes it easy to write automated tests of web applications. It has drivers for Chrome and Firefox for browser-based testing, and zope.testbrowser and PhantomJS for headless testing.
 
Its features include: 
<ul>
<li>simple api</li>
<li>multi webdrivers (chrome webdriver, firefox webdriver, phantomjs webdriver, zopetestbrowser, remote webdriver)</li>
<li>css and xpath selectors</li>
<li>support to iframe and alert</li>
<li>execute javascript</li>
<li>works with ajax and async javascript</li>
</ul>

Splinter is an open source tool for testing web applications using Python. It lets you automate browser actions, such as visiting URLs and interacting with their items. Splinter is an abstraction layer on top of existing browser automation tools such as Selenium, PhantomJS and zope.testbrowser. It has a high-level API that makes it easy to write automated tests of web applications. It has drivers for Chrome and Firefox for browser-based testing, and zope.testbrowser and PhantomJS for headless testing.

Splinter - Python test framework for web applications

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