Kotest

A guide for generating Trunk-compatible test reports for Kotest

You can automatically detect and manage flaky tests in your Kotest projects by integrating with Trunk. This document explains how to configure Kotest to output JUnit XML reports that can be uploaded to Trunk for analysis.

Checklist

By the end of this guide, you should achieve the following before proceeding to the next steps to configure your CI provider.

• Generate a compatible test report
• Configure the report file path or glob
• Disable retries for better detection accuracy
• Test uploads locally

After correctly generating reports following the above steps, you’ll be ready to move on to the next steps to configure uploads in CI.

Generating Reports

Steps for generating JUnit XML reports for Kotest depend on the build system you use for your project:

Gradle

Tests run with Gradle will generate Trunk-compatible JUnit XML reports by default. You can further configure reporting behavior in your build.gradle.kts or build.gradle.

Maven

Kotest projects using Maven require the following to be added to a project’s pom.xml so JUnit XML reports can be generated:

• the maven-surefire-plugin must be added to the plugins section of pom.xml

<project>
    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-surefire-plugin</artifactId>
                <version>3.2.2</version>
            </plugin>
            
            <!-- other plugins -->
        </plugins>
    </build>
</project>

• the kotest-extensions-junitxml must be added to the dependencies section of pom.xml

<dependencies>
    <dependency>
        <groupId>io.kotest</groupId>
        <artifactId>kotest-extensions-junitxml-jvm</artifactId>
        <version>5.9.0</version>
        <scope>test</scope>
    </dependency>
    
    <!-- other dependencies -->
</dependencies>

Report File Path

You can configure the path for generated JUnit XML files:

Gradle

By default, Kotlin projects will produce a directory with JUnit XML reports under ./app/build/test-results/test. You can locate these files with the glob "./app/build/test-results/test/*.xml".

If you wish to override the default test result path, you can do so in the build.gradle.kts or build.gradle files:

java.testResultsDir = layout.buildDirectory.dir("junit-reports")

Maven

You can change the report file path by configuring the reportsDirectory in your maven-surefire-plugin in your pom.xml file:

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-surefire-plugin</artifactId>
    <version>3.2.2</version>
    <configuration>
        <reportsDirectory>${project.build.directory}/junit/</reportsDirectory>
    </configuration>
</plugin>

The example above will output JUnit XML reports that can be located with the /target/junit/*.xml glob.

Disable Retries

You need to disable automatic retries if you previously enabled them. Retries compromise the accurate detection of flaky tests. You should disable retries for accurate detection and use the Quarantining feature to stop flaky tests from failing your CI jobs.

Gradle

If you’ve enabled retries using a plugin like the test-retry-gradle-plugin, disable it when running tests for Trunk flaky tests.

Maven

Maven uses the maven-surefire-plugin to run tests, which allows you to control the test retry behavior. You can disable retries by specifying 0 retries:

mvn -Dsurefire.rerunFailingTestsCount=0 test

Try It Locally

The Validate Command

You can validate your test reports using the Trunk CLI. If you don’t have it installed already, you can install and run the validate command like this:

Linux (x64)

SKU="trunk-analytics-cli-x86_64-unknown-linux.tar.gz"
curl -fL --retry 3 \
  "https://github.com/trunk-io/analytics-cli/releases/latest/download/${SKU}" \
  | tar -xz

chmod +x trunk-analytics-cli
./trunk-analytics-cli validate --junit-paths "./app/junit-reports/*.xml"

Linux (arm64)

SKU="trunk-analytics-cli-aarch64-unknown-linux.tar.gz"
curl -fL --retry 3 \
  "https://github.com/trunk-io/analytics-cli/releases/latest/download/${SKU}" \
  | tar -xz

chmod +x trunk-analytics-cli
./trunk-analytics-cli validate --junit-paths "./app/junit-reports/*.xml"

macOS (arm64)

SKU="trunk-analytics-cli-aarch64-apple-darwin.tar.gz"
curl -fL --retry 3 \
  "https://github.com/trunk-io/analytics-cli/releases/latest/download/${SKU}" \
  | tar -xz

chmod +x trunk-analytics-cli
./trunk-analytics-cli validate --junit-paths "./app/junit-reports/*.xml"

macOS (x64)

SKU="trunk-analytics-cli-x86_64-apple-darwin.tar.gz"
curl -fL --retry 3 \
  "https://github.com/trunk-io/analytics-cli/releases/latest/download/${SKU}" \
  | tar -xz

chmod +x trunk-analytics-cli
./trunk-analytics-cli validate --junit-paths "./app/junit-reports/*.xml"

Make sure to specify the path to your JUnit XML test reports.

This will not upload anything to Trunk. To improve detection accuracy, you should address all errors and warnings before proceeding to the next steps.

Test Upload

Before modifying your CI jobs to automatically upload test results to Trunk, try uploading a single test run manually.

You make an upload to Trunk using the following command:

./trunk-analytics-cli upload --junit-paths "./app/junit-reports/*.xml" \
    --org-url-slug <TRUNK_ORG_SLUG> \
    --token <TRUNK_ORG_TOKEN>

You can find your Trunk organization slug and token in the settings or by following these instructions. After your upload, you can verify that Trunk has received and processed it successfully in the Uploads tab. Warnings will be displayed if the report has issues.

Next Steps

Configure your CI to upload test runs to Trunk. Find the guides for your CI framework below:

Atlassian Bamboo		atlassian-bamboo
Azure DevOps Pipelines		azure-devops-pipelines	azure.png
BitBucket Pipelines		bitbucket-pipelines	bitbucket.png
BuildKite		buildkite	buildkite.png
CircleCI		circleci	circle-ci.png
Drone CI		droneci	drone.png
GitHub Actions		github-actions	github.png
Gitlab		gitlab	gitlab.png
Jenkins		jenkins	jenkins.png
Semaphore		semaphoreci	semaphore.png
TeamCity		https://github.com/trunk-io/docs/blob/main/.gitbook/includes/broken-reference/README.md	teamcity.png
Travis CI		travisci	travis.png
Other CI Providers		otherci	other.png