How to Fix the Issue of Unable to Run JUnit5 Tests with Maven

Discover the solution to resolving the problem of running JUnit5 tests with Maven. Learn how to configure the Maven Surefire Plugin effectively.
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This video is based on the question https://stackoverflow.com/q/70722701/ asked by the user 'Angela Lopez' ( https://stackoverflow.com/u/16327180/ ) and on the answer https://stackoverflow.com/a/70723112/ provided by the user 'Angela Lopez' ( https://stackoverflow.com/u/16327180/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Fixing the Issue of Unable to Run JUnit5 Tests with Maven

Running tests is a crucial part of the software development lifecycle, especially in Java applications using Spring Boot and JUnit5. However, many developers encounter issues where their JUnit5 tests run smoothly in an Integrated Development Environment (IDE) but fail to execute using Maven. In this guide, we'll dive into understanding this problem and how to fix it.

The Problem

Imagine you're working on a Java application that relies on JUnit5 for testing. You've written a bunch of test cases, and everything works fine when running them through your IDE. But as soon as you try to execute mvn test from the command line, you’re met with this frustrating output:

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This output demonstrates that no tests were executed, leading to confusion. Why does it work in your IDE but not with Maven?

Understanding the Cause

Upon further investigation, you might find that the issue arises from a mix-up between JUnit4 and JUnit5 dependencies, particularly when using the Maven Surefire Plugin. If the plugin is not configured correctly, it fails to run JUnit5 tests, leading to the scenario where it claims a "BUILD SUCCESS" without executing any tests.

Common Culprits

Residual JUnit4 Dependencies: Often, leftover JUnit4 dependencies linger in the project, causing conflicts with JUnit5.

Maven Surefire Plugin Configuration: The absence of proper configuration or recommendations for JUnit5 can inhibit test execution.

The Solution

To resolve this issue, you need to ensure that the Maven Surefire Plugin is explicitly set up to run JUnit5 tests correctly. Here is a step-by-step guide to fix the problem:

Step 1: Update Your pom.xml

You need to adjust the Maven Surefire Plugin section in your pom.xml file:

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Important Notes:

Ensure you are using the correct version of the maven-surefire-plugin that supports JUnit5.

The inclusion of junit-jupiter dependency tells Maven to recognize and run JUnit5 tests properly.

Step 2: Clean Your Project

After making the above changes, it can be helpful to clean your project to remove any previously compiled artifacts. Use the command:

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This gives you a fresh start before you proceed to run your tests again.

Step 3: Run Your Tests

Finally, execute your tests with:

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Expected Outcome

If configured correctly, you should now see your test results populated instead of the earlier issues, giving you a detailed output that lists the tests run, their successes, and any failures.

Conclusion

Encountering issues when running JUnit5 tests with Maven can be a common frustration but is easily fixable by updating your Maven Surefire Plugin settings. Ensure you check for residual JUnit4 dependencies, configure the plugin properly, and clean your project to smooth out any hiccups. Follow these steps, and watch your tests run successfully from the command line!

Now you're ready to ensure your JUnit5 tests run seamlessly in your Java projects using Maven! Happy coding!

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