Vitest

A guide for generating Trunk-compatible test reports with Vitest

You can automatically detect and manage flaky tests in your Vitest projects by integrating with Trunk. This document explains how to configure Vitest 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

Trunk detects flaky tests by analyzing test reports automatically uploaded from your CI jobs. You can do this by generating Trunk-compatible XML reports from your test runs.

You can configure Vitest to produce a Trunk-compatible JUnitXML report by updating your vitest.config.ts.

vitest.config.ts

import { defineConfig } from 'vitest/config';

export default defineConfig({
  test: {
    reporters: [
      ['junit', { outputFile: './junit.xml' }],
    ],
  },
});

Report File Path

The outputFile: './junit.xml' option specifies the path of the JUnit report. You'll need this path later when configuring automatic uploads to Trunk.

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.

If you've enabled retries, you can disable them following the Vitest docs for more accurate results.

Try It Locally

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:

The Validate Command

curl -fsSLO --retry 3 https://trunk.io/releases/trunk && chmod +x trunk
./trunk flakytests validate --junit-paths "./junit.xml"

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:

curl -fsSLO --retry 3 https://trunk.io/releases/trunk && chmod +x trunk
./trunk flakytests upload --junit-paths "./junit.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.