To generate an LCOV coverage file for JavaScript tests in an ASP.NET Core .NET app using @playwright/test, follow these steps:
Use Playwright's Coverage API: Playwright provides a Coverage API to gather information about JavaScript and CSS usage on a page. Note that Coverage APIs are only supported on Chromium-based browsers.
Start collecting coverage data: Use the startJSCoverage()
method from the Coverage object. This method returns a promise that resolves when coverage collection starts.
await page.coverage.startJSCoverage();
https://ray.run
and perform the required actions. The executed JavaScript code will be recorded for later analysis.await page.goto('https://ray.run');
stopJSCoverage()
method from the Coverage object. This method returns a promise that resolves with an array of objects representing each script evaluated on the page during recording.const coverage = await page.coverage.stopJSCoverage();
import { chromium } from 'playwright';
import v8toIstanbul from 'v8-to-istanbul';
(async () => {
const browser = await chromium.launch();
const page = await browser.newPage();
await page.coverage.startJSCoverage();
await page.goto('https://ray.run');
const coverage = await page.coverage.stopJSCoverage();
for (const entry of coverage) {
const converter = v8toIstanbul('', 0, { source: entry.source });
await converter.load();
converter.applyCoverage(entry.functions);
console.log(JSON.stringify(converter.toIstanbul()));
}
await browser.close();
})();
By following these steps, you can generate an LCOV coverage file for JavaScript tests in your ASP.NET Core .NET app using @playwright/test.
If you still have questions, please ask a question and I will try to answer it.
Rayrun is a community for QA engineers. I am constantly looking for new ways to add value to people learning Playwright and other browser automation frameworks. If you have feedback, email [email protected].