@tracecov/playwright

Automatic OpenAPI coverage capture for Playwright API testing.

Install

npm install -D @tracecov/playwright

Usage

Swap the test import and add the reporter.

// tests/api.spec.ts
import { test } from '@tracecov/playwright';
import { expect } from '@playwright/test';

test('lists pets', async ({ request }) => {
  const res = await request.get('/pets');
  expect(res.ok()).toBeTruthy();
});

// playwright.config.ts
import { defineConfig } from '@playwright/test';

export default defineConfig({
  use: { baseURL: 'http://localhost:8080' },
  reporter: [
    ['list'],
    ['@tracecov/playwright/reporter', {
      schema: './openapi.json',
      report: { html: 'coverage.html', markdown: 'coverage.md' },
      thresholds: { operations: 80 },
    }],
  ],
});

A reporter configured with neither report nor thresholds emits nothing — set at least one to get output.

Contexts you create yourself (request.newContext(), global setup) aren't covered by the fixture — wrap them:

import { wrapRequest, createDirRecorder, interactionsDir } from '@tracecov/playwright';

const { recorder, flush } = createDirRecorder(interactionsDir());
const ctx = wrapRequest(await request.newContext(), recorder);
// ... use ctx ...
flush();

Limitations

• Context-level headers. Only per-call headers are recorded. Headers set on the context (newContext({ extraHTTPHeaders }), auth) are merged by Playwright with no public getter, so coverage of header parameters supplied that way is missed.
• Network errors with relative paths. A request that fails before a response, when its URL is relative to a context baseURL, isn't recorded as an operation error (Playwright exposes no baseURL to resolve it). Successful-response coverage is unaffected.
• Interactions directory. Workers and the reporter share os.tmpdir()/tracecov-playwright-<cwd-hash>. Set TRACECOV_PLAYWRIGHT_DIR to override it — e.g. to isolate concurrent runs that share one working directory.