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Learn how to set up and run JUnit tests in your Kotlin Multiplatform project with a simple tweak to your build.gradle file.
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How to Successfully Run JUnit Tests in Your Kotlin Multiplatform Project

If you've recently ventured into Kotlin Multiplatform (KMP) development, you may find yourself facing the challenge of running JUnit tests. Many developers have encountered the issue of successfully executing tests but not seeing any output or results, which can be frustrating. If your project builds successfully but doesn’t run the tests as expected, you’re not alone. In this guide, we will explore how to tackle this issue and ensure your tests are executed properly.

The Problem: Missing Test Outputs

When you run your tests with the command:

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You might see a message like this:

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You might expect to see the outputs of your tests, such as "Hello World," but instead, nothing appears. This happens because the test tasks are not configured to use the JUnit platform.

Example of a Test Case

You might have a simple test case in src/jvmTest/kotlin like this:

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However, running the tests yields no output, leaving you questioning if the tests were even executed. Even after changing your test logic, there can still be no execution results.

The Solution: Configure Your build.gradle File

The solution to this issue can be reached by modifying your build.gradle file to properly configure the test tasks for the JUnit platform. Here’s how to do it:

Step-by-Step Configuration

Locate your build.gradle file.

Add the following configuration after your sourceSets section:

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This line tells Gradle to use JUnit 5 as the platform for running your tests.

Updated build.gradle Example

With the above tweak, your updated build.gradle file should look something like this:

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Running Your Tests

With these changes applied, run the build command again:

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This time, you should see the output from your tests, including any console prints you added within their execution. Your issue of executing tests without seeing results will be resolved.

Conclusion

By simply configuring your build.gradle file to use the JUnit platform, you can ensure that your tests are executed correctly in your Kotlin Multiplatform project. This minor adjustment can save you a significant amount of time and frustration while working with Kotlin testing frameworks. Happy testing, and may your Kotlin Multiplatform projects be successful!