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

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

Keploy is a no-code testing platform that generates tests from API calls. It converts API calls into testcases. Mocks are automatically generated with the actual request/responses.
 
It can automatically mock network/external dependencies with correct responses. No more manually writing mocks for dependencies like DBs, internal services, or third party services like twilio, shopify or stripe. It can safely replay writes or mutations by capturing from local or other environments. 
 
It also does automatic instrumentation for popular libraries/drivers like sql, http, grpc, etc. Web Console is available to visually understand the results, update behaviour and share findings across your team.

Keploy is a no-code testing platform that generates tests from API calls. It converts API calls into testcases. Mocks are automatically generated with the actual request/responses.

Keploy - No code API testing platform. Create unit tests and data mocks from API calls

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

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