Playwright Test Coverage

A Playwright extension that collects code coverage from running end-to-end tests. Assumes that code has been instrumented with babel-plugin-istanbul during the build process.

Prerequisites

• Playwright test framework
• babel-plugin-istanbul plugin
• nyc for running tests

npm i -D @playwright/test babel-plugin-istanbul nyc

Installation

npm i -D playwright-test-coverage

Usage

Write your Playwright tests as usual, except require test and expect from this package as follows:

// tests/foo.spec.js
const { test, expect } = require("playwright-test-coverage");

// Use test and expect as usual
test("basic test", async ({ page }) => {
  await page.goto("https://playwright.dev/");
  const title = page.locator(".navbar__inner .navbar__title");
  await expect(title).toHaveText("Playwright");
});

Then, instrument your front end source code for coverage using the babel-plugin-istanbul plugin.

Finally, run your server via nyc to capture code coverage. For more details see istanbul/nyc.

Options

• ISTANBUL_TEMP_DIR - Set this environment variable to specify where Istanbul coverage files should be output. Defaults to $CWD/.nyc_output.

Demo

See anishkny/playwright-test-coverage-demo or accompanying blog post.

Contributing

Pull requests are welcome. For major changes, please open an issue first to discuss what you would like to change.

Please make sure to update tests as appropriate.

Acknowledgements

Inspired by mxschmitt/playwright-test-coverage.

License

MIT