Test Report Integration in Bun.js
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📊 Test Report Integration in Bun.js: A Practical Guide
As Bun.js continues to disrupt the JavaScript ecosystem with its lightning-fast performance and developer-friendly tooling, its testing capabilities are also rapidly evolving. While Bun’s native test runner is sleek and efficient, developers working in professional environments often require one more crucial piece—**test report integration** 📋. Whether for CI/CD pipelines, debugging, or collaboration, structured test reports help ensure code quality and visibility.
🔍 Why Test Reports Matter in Modern Development
Test reports are not just a nice-to-have. They:
- ✅ Help identify failing test cases at a glance
- 📈 Provide historical trends and test performance insights
- 🛠️ Integrate seamlessly with CI/CD tools (GitHub Actions, Jenkins, etc.)
- 📤 Allow exporting in formats like JUnit, JSON, or HTML
Unfortunately, Bun’s test runner doesn’t natively support exporting test reports (yet), but we can still integrate reporting using smart workarounds 🧠.
🛠️ Current State of Test Reporting in Bun.js
As of now, the built-in bun test command outputs results to the terminal. Here's a sample:
✔ math: adds correctly [OK]
✔ math: subtracts correctly [OK]
2 tests passed (2/2)
While clear and fast, this isn't enough for large teams or automated deployments. So, what can you do? Let’s explore the options.
📤 Redirecting Output to File (Basic Reporting)
A quick and simple solution is redirecting test output to a file:
bun test > test-report.txt
This gives you a raw text file of test results that can be stored or reviewed post-run. Not ideal for parsing, but effective for quick checks.
📦 Using External Wrappers for JUnit/JSON Output
While Bun’s test runner doesn’t support JUnit output directly, you can build a wrapper around your tests. One approach is to manually structure output in JSON and log it in a format your CI tool can understand:
// test-wrapper.ts
import { test, expect } from "bun";
let results = [];
function recordTest(name, fn) {
try {
fn();
results.push({ name, status: "passed" });
} catch (err) {
results.push({ name, status: "failed", message: err.message });
}
}
recordTest("should add numbers", () => {
expect(2 + 3).toBe(5);
});
Bun.write("report.json", JSON.stringify(results, null, 2));
After running:
bun run test-wrapper.ts
You get a JSON report in report.json—perfect for pipelines or dashboards.
🔌 Integrating with GitHub Actions 📦
Once you generate structured output (e.g., report.json), you can pass it into your CI setup. Here’s a snippet for GitHub Actions:
- name: Run Bun tests
run: bun run test-wrapper.ts
- name: Upload Test Report
uses: actions/upload-artifact@v3
with:
name: bun-test-report
path: report.json
This way, your team can access the latest test reports in every PR or commit run.
🧪 Advanced Reporting with Custom Formatters
If you want HTML, JUnit XML, or rich JSON output, consider writing a small formatter script to convert the test results:
// generate-html-report.ts
import { readFileSync, writeFileSync } from "fs";
const data = JSON.parse(readFileSync("report.json", "utf-8"));
let html = `<html><body><h2>Test Report</h2><ul>`;
for (const test of data) {
html += `<li>${test.name} - <strong>${test.status}</strong></li>`;
}
html += "</ul></body></html>";
writeFileSync("report.html", html);
Run this after your tests and publish the resulting HTML wherever needed.
🔮 Future: Native Reporting in Bun?
The Bun.js team is moving fast, and it's likely that built-in support for JUnit, JSON, or HTML reporting may come soon. Until then, these workarounds help bridge the gap and ensure Bun is CI-ready 💪.
✅ Conclusion
Even though Bun.js doesn’t (yet) support test report integration out of the box, with a bit of scripting and creative thinking, you can generate meaningful reports using Bun’s native test runner. Whether you're working on a personal project or managing a team workflow, **test reporting is essential for reliability**. Try the methods above, and stay ahead of the curve with Bun’s blazing-fast tooling! ⚡📁
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