PHPStan focuses on finding errors in your code without actually running it. It catches whole classes of bugs even before you write tests for the code.PHPStan moves PHP closer to compiled languages in the sense that the correctness of each line of the code can be checked before you run the actual line.

PHPStan - PHP Static Analysis Tool - discover bugs in your code without running it!

Mockito is a mocking framework that tastes really good. It lets you write beautiful tests with a clean & simple API. Mockito doesn’t give you hangover because the tests are very readable and they produce clean verification errors.

Mockito - Most popular Mocking framework for unit tests written in Java

MailDev is a simple way to test your project's generated emails during development with an easy to use web interface that runs on your machine built on top of Node.js.
 Features: 
<ul>
 <li>Toggle between HTML, plain text views as well as view the source or email headers</li>
 <li>Test Responsive Emails w/ resizeable preview pane available for 320/480/600px viewports</li>
 <li>Receive and view email attachments</li>
 <li>New emails appear instantly in interface when received (via Websockets)</li>
 <li>Command line interface for configuring SMTP and Web interface ports</li>
 <li>Ability to relay email to an upstream SMTP server (like Gmail)</li>
 <li>Export .eml files</li>
 </ul>

MailDev is a simple way to test your project's generated emails during development with an easy to use web interface that runs on your machine built on top of Node.js.

MailDev - SMTP Server + Web Interface for viewing and testing emails during development

Hoppscotch is an open source API development ecosystem. It is light weight and can send fast requests and get/copy responses in real-time. It supports WebSocket, Server Sent Events, Socket.IO, MQTT and GraphQL. You can also install as a PWA (Progressive Web App) on your device.

Hoppscotch - Open source API development ecosystem 

Pest is a Testing Framework with a focus on simplicity. It was carefully crafted to bring the joy of testing to PHP.  Tests are easy to read and understand. Also, it's powered by PHPUnit — just run your current PHPUnit test suite with Pest and it will just work. 



Pest - Elegant PHP Testing Framework with a focus on simplicity

Localtunnel exposes your localhost to the world for easy testing and sharing! No need to mess with DNS or deploy just to have others test out your changes.Great for working with browser testing tools like browserling or external api callback services like twilio which require a public url for callbacks.

Localtunnel - Expose yourself to the world


Storybook is a development environment for UI components. It allows you to browse a component library, view the different states of each component, and interactively develop and test components. Storybook runs outside of your app. This allows you to develop UI components in isolation, which can improve component reuse, testability, and development speed. You can build quickly without having to worry about application-specific dependencies.
 
Storybook helps to document UI to share with your team. You can publish Storybook online to give your team a universal reference point for feedback.

Storybook is a development environment for UI components. It allows you to browse a component library, view the different states of each component, and interactively develop and test components. Storybook runs outside of your app. This allows you to develop UI components in isolation, which can improve component reuse, testability, and development speed. You can build quickly without having to worry about application-specific dependencies.

Storybook - Build bulletproof UI components faster in React, Vue, Angular, and more.

Protractor is an end-to-end test framework for Angular and AngularJS applications. Protractor runs tests against your application running in a real browser, interacting with it as a user would. 

Protractor - End to End test framework for Angular apps

Vegeta is a versatile HTTP load testing tool built out of a need to drill HTTP services with a constant request rate. It can be used both as a command line utility and a library.Get them here.

Vegeta - HTTP load testing tool and library. 

Ginkgo is a BDD-style Go testing framework built to help you efficiently write expressive and comprehensive tests. It is best paired with the Gomega matcher library but is designed to be matcher-agnostic.

Ginkgo - BDD Testing Framework for Go

Codeception is a modern full-stack testing framework for PHP. Inspired by BDD, it provides an absolutely new way of writing acceptance, functional and even unit tests. Powered by PHPUnit. Codeception provides high-level domain language for tests. Tests are represented as a set of user's actions. Tests can be executed using Firefox, Chrome, Safari or Cloud Testing services with Selenium WebDriver. Browser can be emulated with HTTP-requests through CURL with PhpBrowser. 
 
Codeception simplifies REST and SOAP testing. There are flexible commands to test structure and data of JSON and XML responses. Testing can be done over HTTP or inside a framework.

Codeception is a modern full-stack testing framework for PHP. Inspired by BDD, it provides an absolutely new way of writing acceptance, functional and even unit tests. Powered by PHPUnit.  Codeception provides high-level domain language for tests. Tests are represented as a set of user's actions.  Tests can be executed using Firefox, Chrome, Safari or Cloud Testing services with Selenium WebDriver. Browser can be emulated with HTTP-requests through CURL with PhpBrowser. 

Codeception - Full-stack testing PHP framework

Karate is the only open-source tool to combine API test-automation, mocks, performance-testing and even UI automation into a single, unified framework. The BDD syntax popularized by Cucumber is language-neutral, and easy for even non-programmers. Assertions and HTML reports are built-in, and you can run tests in parallel for speed.
 
Its features include: 
<ul>
<li>Scripts are plain-text, require no compilation step or IDE, and teams can collaborate using Git / standard SCM</li>
<li>Elegant&nbsp;<a href="https://en.wikipedia.org/wiki/Domain-specific_language">DSL</a>&nbsp;syntax &lsquo;natively&rsquo; supports JSON and XML - including&nbsp;<a href="https://karatelabs.github.io/karate/#set">JsonPath</a>&nbsp;and&nbsp;<a href="https://karatelabs.github.io/karate/#xpath-functions">XPath</a>&nbsp;expressions</li>
<li>Tests are super-readable - as scenario data can be expressed in-line, in human-friendly&nbsp;<a href="https://karatelabs.github.io/karate/#json">JSON</a>,&nbsp;<a href="https://karatelabs.github.io/karate/#xml">XML</a>, Cucumber&nbsp;<a href="https://karatelabs.github.io/karate/#the-cucumber-way">Scenario</a>&nbsp;Outline&nbsp;<a href="https://karatelabs.github.io/karate/#table">tables</a>, or a&nbsp;<a href="https://karatelabs.github.io/karate/#set-multiple">payload builder</a>&nbsp;approach&nbsp;<a href="https://gist.github.com/ptrthomas/d6beb17e92a43220d254af942e3ed3d9">unique to Karate</a></li>
<li><a href="https://github.com/intuit/karate/wiki/IDE-Support#vs-code-karate-plugin">Fully featured debugger</a>&nbsp;that can step&nbsp;backwards&nbsp;and even&nbsp;<a href="https://twitter.com/KarateDSL/status/1167533484560142336">re-play a step while editing it</a>&nbsp;- a&nbsp;huge&nbsp;time-saver</li>
<li>Ideal for testing the highly dynamic responses from&nbsp;<a href="http://graphql.org/">GraphQL</a>&nbsp;API-s because of Karate&rsquo;s built-in&nbsp;<a href="https://karatelabs.github.io/karate/#text">text-manipulation</a>&nbsp;and&nbsp;<a href="https://github.com/json-path/JsonPath#path-examples">JsonPath</a>&nbsp;capabilities</li>
<li>Re-use of payload-data and user-defined functions across tests is&nbsp;<a href="https://karatelabs.github.io/karate/#reading-files">so easy</a>&nbsp;- that it becomes a natural habit for the test-developer</li>
<li>Support for&nbsp;<a href="https://karatelabs.github.io/karate/#data-driven-tests">data-driven tests</a>&nbsp;and being able to&nbsp;<a href="https://karatelabs.github.io/karate/#tags">tag or group</a>&nbsp;tests is built-in, no need to rely on an external framework</li>
<li>Multi-threaded&nbsp;<a href="https://karatelabs.github.io/karate/#parallel-execution">parallel execution</a>, which is a huge time-saver, especially for integration and end-to-end tests</li>
<li>Option to use as a light-weight&nbsp;<a href="https://github.com/intuit/karate/tree/master/karate-netty#standalone-jar">stand-alone executable</a>&nbsp;- convenient for teams not comfortable with Java</li>
<li>Cross platform&nbsp;<a href="https://karatelabs.github.io/karate/karate-robot">Desktop Automation</a>&nbsp;that can be&nbsp;<a href="https://twitter.com/ptrthomas/status/1215534821234995200">mixed into Web Automation flows</a>&nbsp;if needed</li>
<li>Gatling integration can hook into&nbsp;<a href="https://github.com/intuit/karate/tree/master/karate-gatling#custom">any&nbsp;custom Java code</a>&nbsp;- which means that you can perf-test even non-HTTP protocols such as&nbsp;<a href="https://github.com/thinkerou/karate-grpc">gRPC</a></li>
<li><a href="https://karatelabs.github.io/karate/karate-mock-servlet">Mock HTTP Servlet</a>&nbsp;that enables you to test&nbsp;any&nbsp;controller servlet such as Spring Boot / MVC or Jersey / JAX-RS - without having to boot an app-server, and you can use your HTTP integration tests un-changed</li>
<li>&nbsp;</li>
</ul>

Karate is the only open-source tool to combine API test-automation, mocks, performance-testing and even UI automation into a single, unified framework. The BDD syntax popularized by Cucumber is language-neutral, and easy for even non-programmers. Assertions and HTML reports are built-in, and you can run tests in parallel for speed.

karate - Test Automation Made Simple

Robolectric is the industry-standard unit testing framework for Android. With Robolectric, your tests run in a simulated Android environment inside a JVM, without the overhead and flakiness of an emulator. Robolectric tests routinely run 10x faster than those on cold-started emulators. Robolectric supports running unit tests for 16 different versions of Android, ranging from Jelly Bean (API level 16) to SV2 (API level 32).
 
Unlike traditional emulator-based Android tests, Robolectric tests run inside a sandbox which allows the Android environment to be precisely configured to the desired conditions for each test, isolates each test from its neighbors, and extends the Android framework with test APIs which provide minute control over the Android framework’s behavior and visibility of state for assertions.

Robolectric is the industry-standard unit testing framework for Android. With Robolectric, your tests run in a simulated Android environment inside a JVM, without the overhead and flakiness of an emulator. Robolectric tests routinely run 10x faster than those on cold-started emulators. Robolectric supports running unit tests for 16 different versions of Android, ranging from Jelly Bean (API level 16) to SV2 (API level 32).

Robolectric - Android Unit Testing Framework

CasperJS is a navigation scripting & testing utility for PhantomJS and SlimerJS (still experimental). It eases the process of defining a full navigation scenario and provides useful high-level functions, methods & syntactic sugar for doing common tasks such as Filling forms, Clicking links, Capturing screenshots of a page, Downloading resources, even binary ones, Writing functional test suites, exporting results as JUnit XML (xUnit) and lot more.

Casperjs - Navigation scripting and testing utility for PhantomJS and SlimerJS

PostWoman is an API request builder which is a free, fast, and beautiful alternative to Postman. It is lightweight, Crafted with minimalistic UI design. Faster, lighter, cleaner, minimal & responsive.  Send requests and get/copy responses in real-time. 


PostWoman - API request builder - A free, fast, and beautiful alternative to Postman

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