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Assertj vs JUnit: What are the differences?

What is Assertj? Fluent assertions for java. It provides a rich and intuitive set of strongly-typed assertions to use for unit testing (with JUnit, TestNG or any other test framework).

What is JUnit? A programmer-oriented testing framework for Java. JUnit is a simple framework to write repeatable tests. It is an instance of the xUnit architecture for unit testing frameworks.

Assertj belongs to "Java Tools" category of the tech stack, while JUnit can be primarily classified under "Testing Frameworks".

Assertj and JUnit are both open source tools. It seems that JUnit with 8.11K GitHub stars and 3.08K forks on GitHub has more adoption than Assertj with 1.94K GitHub stars and 478 GitHub forks.

According to the StackShare community, JUnit has a broader approval, being mentioned in 181 company stacks & 546 developers stacks; compared to Assertj, which is listed in 4 company stacks and 6 developer stacks.

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What is Assertj?

It provides a rich and intuitive set of strongly-typed assertions to use for unit testing (with JUnit, TestNG or any other test framework).

What is JUnit?

JUnit is a simple framework to write repeatable tests. It is an instance of the xUnit architecture for unit testing frameworks.

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What are some alternatives to Assertj and JUnit?
guava
The Guava project contains several of Google's core libraries that we rely on in our Java-based projects: collections, caching, primitives support, concurrency libraries, common annotations, string processing, I/O, and so forth.
Java 8
It is a revolutionary release of the world’s no 1 development platform. It includes a huge upgrade to the Java programming model and a coordinated evolution of the JVM, Java language, and libraries. Java 8 includes features for productivity, ease of use, improved polyglot programming, security and improved performance.
RxJava
A library for composing asynchronous and event-based programs by using observable sequences for the Java VM.
Apache FreeMarker
It is a "template engine"; a generic tool to generate text output (anything from HTML to auto generated source code) based on templates. It's a Java package, a class library for Java programmers.
Quarkus
It tailors your application for GraalVM and HotSpot. Amazingly fast boot time, incredibly low RSS memory (not just heap size!) offering near instant scale up and high density memory utilization in container orchestration platforms like Kubernetes. We use a technique we call compile time boot.
See all alternatives