chore: add playwright cursor skill

.cursor/skills/playwright-testing/infrastructure-ci-cd/reporting.md

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+# Test Reports & Artifacts
+
+## Table of Contents
+
+1. [CLI Commands](#cli-commands)
+2. [Reporter Configuration](#reporter-configuration)
+3. [Custom Reporter](#custom-reporter)
+4. [Trace Configuration](#trace-configuration)
+5. [Screenshot & Video Settings](#screenshot--video-settings)
+6. [Artifact Directory Structure](#artifact-directory-structure)
+7. [CI Artifact Upload](#ci-artifact-upload)
+8. [Decision Guide](#decision-guide)
+9. [Anti-Patterns](#anti-patterns)
+10. [Troubleshooting](#troubleshooting)
+
+> **When to use**: Configuring test output for debugging, CI dashboards, and team visibility.
+
+## CLI Commands
+
+```bash
+# Display last HTML report
+npx playwright show-report
+
+# Specify reporter
+npx playwright test --reporter=html
+npx playwright test --reporter=dot           # minimal CI output
+npx playwright test --reporter=line          # one line per test
+npx playwright test --reporter=json          # machine-readable
+npx playwright test --reporter=junit         # CI integration
+
+# Combine reporters
+npx playwright test --reporter=dot,html
+
+# Merge sharded reports
+npx playwright merge-reports --reporter=html ./blob-report
+```
+
+## Reporter Configuration
+
+### Environment-Based Setup
+
+```typescript
+// playwright.config.ts
+import { defineConfig } from '@playwright/test';
+
+export default defineConfig({
+  reporter: process.env.CI
+    ? [
+        ['dot'],
+        ['html', { open: 'never' }],
+        ['junit', { outputFile: 'results/junit.xml' }],
+        ['github'],
+      ]
+    : [
+        ['list'],
+        ['html', { open: 'on-failure' }],
+      ],
+});
+```
+
+### Reporter Types
+
+| Reporter | Output | Use Case |
+|---|---|---|
+| `list` | One line per test | Local development |
+| `line` | Single updating line | Local, less verbose |
+| `dot` | `.` pass, `F` fail | CI logs |
+| `html` | Interactive HTML page | Post-run analysis |
+| `json` | Machine-readable JSON | Custom tooling |
+| `junit` | JUnit XML | CI platforms |
+| `github` | PR annotations | GitHub Actions |
+| `blob` | Binary archive | Shard merging |
+
+### JSON Output to File
+
+```typescript
+import { defineConfig } from '@playwright/test';
+
+export default defineConfig({
+  reporter: [
+    ['json', { outputFile: 'results/output.json' }],
+  ],
+});
+```
+
+### JUnit Customization
+
+```typescript
+import { defineConfig } from '@playwright/test';
+
+export default defineConfig({
+  reporter: [
+    ['junit', {
+      outputFile: 'results/junit.xml',
+      stripANSIControlSequences: true,
+      includeProjectInTestName: true,
+    }],
+  ],
+});
+```
+
+## Custom Reporter
+
+Build custom reporters for Slack notifications, database logging, or dashboards.
+
+```typescript
+// reporters/notification-reporter.ts
+import type {
+  FullResult,
+  Reporter,
+  TestCase,
+  TestResult,
+} from '@playwright/test/reporter';
+
+class NotificationReporter implements Reporter {
+  private passed = 0;
+  private failed = 0;
+  private skipped = 0;
+  private failures: string[] = [];
+
+  onTestEnd(test: TestCase, result: TestResult) {
+    switch (result.status) {
+      case 'passed':
+        this.passed++;
+        break;
+      case 'failed':
+      case 'timedOut':
+        this.failed++;
+        this.failures.push(`${test.title}: ${result.error?.message?.split('\n')[0]}`);
+        break;
+      case 'skipped':
+        this.skipped++;
+        break;
+    }
+  }
+
+  async onEnd(result: FullResult) {
+    const total = this.passed + this.failed + this.skipped;
+    const status = this.failed > 0 ? 'FAILED' : 'PASSED';
+    const message = [
+      `Tests ${status}`,
+      `Passed: ${this.passed} | Failed: ${this.failed} | Skipped: ${this.skipped}`,
+      `Duration: ${(result.duration / 1000).toFixed(1)}s`,
+    ];
+
+    if (this.failures.length > 0) {
+      message.push('', 'Failures:');
+      this.failures.slice(0, 5).forEach((f) => message.push(`  - ${f}`));
+      if (this.failures.length > 5) {
+        message.push(`  ...and ${this.failures.length - 5} more`);
+      }
+    }
+
+    const webhookUrl = process.env.NOTIFICATION_WEBHOOK;
+    if (webhookUrl) {
+      const controller = new AbortController();
+      const timeout = setTimeout(() => controller.abort(), 5000);
+      try {
+        await fetch(webhookUrl, {
+          method: 'POST',
+          headers: { 'Content-Type': 'application/json' },
+          body: JSON.stringify({ text: message.join('\n') }),
+          signal: controller.signal,
+        });
+      } catch (error) {
+        // Intentionally swallow notifier failures to avoid blocking test completion
+        console.warn('Webhook notification failed:', error.message);
+      } finally {
+        clearTimeout(timeout);
+      }
+    }
+  }
+}
+
+export default NotificationReporter;
+```
+
+**Register custom reporter:**
+
+```typescript
+import { defineConfig } from '@playwright/test';
+
+export default defineConfig({
+  reporter: [
+    ['dot'],
+    ['html', { open: 'never' }],
+    ['./reporters/notification-reporter.ts'],
+  ],
+});
+```
+
+## Trace Configuration
+
+Traces capture actions, network requests, DOM snapshots, and console logs.
+
+```typescript
+import { defineConfig } from '@playwright/test';
+
+export default defineConfig({
+  retries: process.env.CI ? 2 : 0,
+  use: {
+    trace: 'on-first-retry',
+  },
+});
+```
+
+### Trace Options
+
+| Value | Behavior | Overhead |
+|---|---|---|
+| `'off'` | Never records | None |
+| `'on'` | Every test | High |
+| `'on-first-retry'` | On first retry after failure | Minimal |
+| `'retain-on-failure'` | Records all, keeps failures | Medium |
+| `'retain-on-first-failure'` | Records all, keeps first failure | Medium |
+
+### Viewing Traces
+
+```bash
+# Local trace viewer
+npx playwright show-trace results/my-test/trace.zip
+
+# From HTML report (click Traces tab)
+npx playwright show-report
+
+# Online viewer: https://trace.playwright.dev
+```
+
+## Screenshot & Video Settings
+
+```typescript
+import { defineConfig } from '@playwright/test';
+
+export default defineConfig({
+  use: {
+    screenshot: 'only-on-failure',
+    video: 'retain-on-failure',
+  },
+});
+```
+
+### Video with Custom Size
+
+```typescript
+use: {
+  video: {
+    mode: 'retain-on-failure',
+    size: { width: 1280, height: 720 },
+  },
+},
+```
+
+### Screenshot Options
+
+| Value | Captures | Disk Cost |
+|---|---|---|
+| `'off'` | Never | None |
+| `'on'` | Every test | High |
+| `'only-on-failure'` | Failed tests | Low |
+
+### Video Options
+
+| Value | Records | Keeps | Disk Cost |
+|---|---|---|---|
+| `'off'` | Never | — | None |
+| `'on'` | Every test | All | Very high |
+| `'on-first-retry'` | On retry | Retried | Low |
+| `'retain-on-failure'` | Every test | Failed | Medium |
+
+## Artifact Directory Structure
+
+```text
+test-results/
+├── checkout-test-chromium/
+│   ├── trace.zip
+│   ├── test-failed-1.png
+│   └── video.webm
+├── login-test-firefox/
+│   ├── trace.zip
+│   └── test-failed-1.png
+└── junit.xml
+
+playwright-report/
+├── index.html
+└── data/
+
+blob-report/
+└── report-1.zip
+```
+
+## CI Artifact Upload
+
+### GitHub Actions
+
+```yaml
+- uses: actions/upload-artifact@v4
+  if: ${{ !cancelled() }}
+  with:
+    name: playwright-report
+    path: playwright-report/
+    retention-days: 14
+
+- uses: actions/upload-artifact@v4
+  if: failure()
+  with:
+    name: test-traces
+    path: |
+      test-results/**/trace.zip
+      test-results/**/*.png
+      test-results/**/*.webm
+    retention-days: 7
+```
+
+## Decision Guide
+
+| Scenario | Reporter Configuration |
+|---|---|
+| Local development | `[['list'], ['html', { open: 'on-failure' }]]` |
+| GitHub Actions | `[['dot'], ['html'], ['github']]` |
+| GitLab CI | `[['dot'], ['html'], ['junit']]` |
+| Azure DevOps / Jenkins | `[['dot'], ['html'], ['junit']]` |
+| Sharded CI | `[['blob'], ['github']]` |
+| Custom dashboard | `[['json', { outputFile: '...' }]]` + custom reporter |
+
+| Artifact | When to Collect | Retention | Upload Condition |
+|---|---|---|---|
+| HTML report | Always | 14 days | `if: ${{ !cancelled() }}` |
+| Traces | On failure | 7 days | `if: failure()` |
+| Screenshots | On failure | 7 days | `if: failure()` |
+| Videos | On failure | 7 days | `if: failure()` |
+| JUnit XML | Always | 14 days | `if: ${{ !cancelled() }}` |
+| Blob report | Always (sharded) | 1 day | `if: ${{ !cancelled() }}` |
+
+## Anti-Patterns
+
+| Anti-Pattern | Problem | Solution |
+|---|---|---|
+| No reporter configured | Default `list` only; no persistent report | Configure `html` + CI reporter |
+| `trace: 'on'` in CI | Massive artifacts, slow uploads | Use `trace: 'on-first-retry'` |
+| `video: 'on'` in CI | Enormous storage, slower tests | Use `video: 'retain-on-failure'` |
+| Upload artifacts only on failure | No report when tests pass | Upload with `if: ${{ !cancelled() }}` |
+| No retention limits | CI storage fills quickly | Set `retention-days: 7-14` |
+| Only `dot` reporter | Cannot drill into failures | Pair `dot` with `html` |
+| JUnit to stdout | Interferes with console output | Write to file |
+| Blocking `onEnd` in custom reporter | Slow HTTP calls delay pipeline | Use `Promise.race` with timeout |
+
+## Troubleshooting
+
+### Empty HTML Report
+
+Check reporter config. HTML report defaults to `playwright-report/`:
+
+```typescript
+import { defineConfig } from '@playwright/test';
+
+export default defineConfig({
+  reporter: [['html', { outputFolder: 'playwright-report', open: 'never' }]],
+});
+```
+
+### Traces Too Large
+
+Switch from `trace: 'on'` to `'on-first-retry'` with retries enabled:
+
+```typescript
+import { defineConfig } from '@playwright/test';
+
+export default defineConfig({
+  retries: process.env.CI ? 2 : 0,
+  use: {
+    trace: 'on-first-retry',
+  },
+});
+```
+
+### JUnit XML Not Recognized
+
+Ensure path matches CI configuration:
+
+```typescript
+reporter: [['junit', { outputFile: 'results/junit.xml' }]],
+```
+
+```yaml
+# GitHub Actions
+- uses: dorny/test-reporter@latest
+  with:
+    path: results/junit.xml
+    reporter: java-junit
+
+# Azure DevOps
+- task: PublishTestResults@latest
+  inputs:
+    testResultsFiles: 'results/junit.xml'
+
+# Jenkins
+junit 'results/junit.xml'
+```
+
+### Empty Merged Report
+
+Use `blob` reporter for sharded runs (not `html`):
+
+```typescript
+import { defineConfig } from '@playwright/test';
+
+export default defineConfig({
+  reporter: process.env.CI
+    ? [['blob'], ['dot']]
+    : [['html', { open: 'on-failure' }]],
+});
+```
+
+### Missing Screenshots in Report
+
+Enable screenshots and keep both directories:
+
+```typescript
+use: {
+  screenshot: 'only-on-failure',
+},
+```
+
+The HTML report embeds screenshots from `test-results/`. Deleting that directory removes screenshots from the report.