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I am getting coverage summary statements unknown ( 0/0 ) - Code Coverage for Playwright

Hi I need help getting codecoverage for my typscript/Lit code,

I have setup my tests using istanbul and getting coverage summary statements unknown ( 0/0 ),

Here's the steps I followed,

  1. Istalled Istanbul: npm install --save-dev nyc

  2. Created the .nycrc file and have this: { "include": ["./test/e2e//*.spec.ts", "../src//*.ts"], "exclude": ["./test/unit", "node_modules"], "report-dir": "coverage/playwright", "reporter": ["lcov", "html"], "all": true, "check-coverage": true, "per-file": true, "extension": [".ts"] },

  3. And running the command like this: npx nyc --reporter=lcov --report-dir=coverage/playwright npm run test:e2e

This thread is trying to answer question "How can I get code coverage for my TypeScript/Lit code using Istanbul with Playwright tests?"

2 replies

I have a BaseFixtures.ts file like this: import * as fs from 'fs'; import * as path from 'path'; import * as crypto from 'crypto'; import { test as baseTest } from '@playwright/test';

const istanbulCLIOutput = path.join(process.cwd(), '.nyc_output');

export function generateUUID(): string { return crypto.randomBytes(16).toString('hex'); }

export const test = baseTest.extend({ context: async ({ context }, use) => { await context.addInitScript(() => window.addEventListener('beforeunload', () => (window as any).collectIstanbulCoverage(JSON.stringify((window as any).coverage)) ), ); await fs.promises.mkdir(istanbulCLIOutput, { recursive: true }); await context.exposeFunction('collectIstanbulCoverage', (coverageJSON: string) => { if (coverageJSON) fs.writeFileSync(path.join(istanbulCLIOutput, playwright_coverage_${generateUUID()}.json), coverageJSON); }); await use(context); for (const page of context.pages()) { await page.evaluate(() => (window as any).collectIstanbulCoverage(JSON.stringify((window as any).coverage))) } } });

export const expect = test.expect; ...I followed this repo: https://github.com/mxschmitt/playwright-test-coverage/blob/main/e2e/baseFixtures.ts GitHub playwright-test-coverage/e2e/baseFixtures.ts at main · mxschmitt/pl... Playwright Test (@playwright/test) demo to collect coverage information via Istanbul - mxschmitt/playwright-test-covera


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