chore: add code coverage

Author: mahdikhashan

.github/workflows/nodejs.yml

@@ -124,6 +124,9 @@ jobs:
       - name: Run E2E tests for webpack version ${{ matrix.webpack-version }}
         run: npm run test:e2e -- --shard=${{ matrix.shard }}
 
+      - name: generate coverage
+        run: npx nyc report --reporter=lcov
+
       - name: Submit coverage data to codecov
         uses: codecov/codecov-action@v4
         with:

test/helpers/playwright-test.js

@@ -1,7 +1,16 @@
 "use strict";
 
+const fs= require('fs');
+const path= require('path');
+const crypto= require('crypto');
 const { test } = require("@playwright/test");
 
+const istanbulCLIOutput = path.join(process.cwd(), '.nyc_output');
+
+function generateUUID() {
+  return crypto.randomBytes(16).toString('hex');
+}
+
 const customTest = test.extend({
   done: [
     // eslint-disable-next-line no-empty-pattern
@@ -17,6 +26,25 @@ const customTest = test.extend({
     },
     { option: true },
   ],
+  context: async ({ context }, use) => {
+    await context.addInitScript(() =>
+      // eslint-disable-next-line no-undef
+      window.addEventListener('beforeunload', () =>
+        // eslint-disable-next-line no-undef
+        window.collectIstanbulCoverage(JSON.stringify(window.__coverage__))
+  ),
+  )
+    await fs.promises.mkdir(istanbulCLIOutput, { recursive: true });
+    await context.exposeFunction('collectIstanbulCoverage', (coverageJSON) => {
+      if (coverageJSON)
+        {fs.writeFileSync(path.join(istanbulCLIOutput, `playwright_coverage_${generateUUID()}.json`), coverageJSON);}
+    });
+    await use(context);
+    for (const page of context.pages()) {
+      // eslint-disable-next-line no-await-in-loop,no-undef
+      await page.evaluate(() => window.collectIstanbulCoverage(JSON.stringify(window.__coverage__)))
+    }
+  }
 });
 
 module.exports = { test: customTest };