Top Java Testing Libraries for Java Developers

Testing software before its release is crucial to the software development life cycle. Finding various shortcomings and fixing them before the final release saves a lot of costs for the organizations.

Releasing software without testing is a recipe for disaster. However, if you think that testing is a cumbersome process there are tools out there for aid. When it comes to Java applications, Java testing frameworks can help you to test your JAVA/J2EE applications with ease.

Here are some of most vital libraries for Java Testing.

JUnit 5

Unit testing framework for the Java programming language.

AssertJ

Fluent chaining assertions java library. One of the most powerful and convenient ways to write assertions. It's also included in the @springboot test framework.

Awaitility

DSL that allows you to express expectations of an asynchronous system in a concise and easy to read manner. Write better tests in asynchronous and multi-threaded apps. It helps to get rid of "Thread.sleep(1000)" in your tests.

REST Assured:

Brings simplicity to testing and validating REST services in Java.

XMLUnit:

This is a library that supports testing XML output in several ways. Assert your XMLs with pleasure.

JsonUnit

JSONUnit a library that simplifies JSON comparison in tests.

Mockito

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

Testcontainers

Testcontainers for Java is a Java library that supports JUnit tests, providing lightweight, throwaway instances of common databases, Selenium web browsers, or anything else that can run in a Docker container.

WireMock

WireMock frees you from dependency on unstable APIs and allows you to develop with confidence. It's easy to launch a mock API server and simulate a host of real-world scenarios and APIs - including REST, SOAP, OAuth2 and more.

Conclusion

Have you used any of these frameworks? Something that was not in the list. Leave a comment and we will improve the list. Thank you for reading.

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