feat: add e2e test cursor skill

.cursor/skills/playwright-testing/debugging.md

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+# Debugging Playwright Tests
+
+> **When to use**: A test is failing and you need to understand why — wrong selectors, timing issues, network failures, or unexpected application state.
+
+## Quick Reference
+
+| Tool | Command | Best For |
+|---|---|---|
+| UI Mode | `npx playwright test --ui` | Interactive exploration, visual timeline, re-running tests |
+| Playwright Inspector | `PWDEBUG=1 npx playwright test` | Step-through debugging, selector playground |
+| Trace Viewer | `npx playwright show-trace trace.zip` | Post-mortem CI failure analysis |
+| CLI debugger | `npx playwright test --debug=cli` | Agent workflows, SSH sessions, terminal-first debugging |
+| Headed mode | `npx playwright test --headed` | Watching the browser during test execution |
+| Slow motion | `npx playwright test --headed --slow-mo=500` | Visually following fast interactions |
+| `page.pause()` | Insert in test code | Pausing at an exact point to inspect state |
+| Verbose API logs | `DEBUG=pw:api npx playwright test` | Seeing every Playwright API call with timing |
+| VS Code extension | Playwright Test for VS Code | Breakpoints, step-through, pick locator |
+
+## Systematic Debugging Workflow
+
+Follow this order. Do not skip to step 5 — most issues resolve by step 2.
+
+```
+1. Read the full error message
+   └─ Check troubleshooting/error-index.md for known patterns
+2. Run with --ui to see what happened visually
+   └─ Timeline shows every action, screenshot at failure point
+3. Enable tracing if not already on
+   └─ use: { trace: 'on' } temporarily in config
+4. Check the network tab in trace for API failures
+   └─ Missing responses, 4xx/5xx, CORS errors
+5. Insert page.pause() at the failure point
+   └─ Inspect live DOM, try selectors in console
+6. Check browser console for JavaScript errors
+   └─ page.on('console') or console tab in trace
+```
+
+## Patterns
+
+### Pattern 1: UI Mode for Interactive Debugging
+
+**Use when**: Developing new tests, investigating failures locally, exploring application behavior.
+**Avoid when**: CI environments (use traces instead).
+
+UI Mode provides a visual timeline, DOM snapshots at each step, network waterfall, and the ability to re-run individual tests.
+
+**TypeScript**
+```typescript
+// Launch UI Mode from terminal:
+// npx playwright test --ui
+
+// Run a specific test file in UI Mode:
+// npx playwright test tests/checkout.spec.ts --ui
+
+// playwright.config.ts — configure for UI Mode convenience
+import { defineConfig } from '@playwright/test';
+
+export default defineConfig({
+  use: {
+    // Traces are always available in UI Mode regardless of this setting,
+    // but this ensures traces are captured for CI failures too
+    trace: 'on-first-retry',
+  },
+});
+```
+
+For flaky tests on Playwright 1.59+, consider `trace: 'retain-on-failure-and-retries'` so you can compare the failing attempt with any passing retries instead of keeping only one trace artifact.
+
+**JavaScript**
+```javascript
+// Launch UI Mode from terminal:
+// npx playwright test --ui
+
+// Run a specific test file in UI Mode:
+// npx playwright test tests/checkout.spec.js --ui
+
+// playwright.config.js
+const { defineConfig } = require('@playwright/test');
+
+module.exports = defineConfig({
+  use: {
+    trace: 'on-first-retry',
+  },
+});
+```
+
+### Pattern 2: Playwright Inspector with PWDEBUG
+
+**Use when**: You need to step through actions one at a time, test selectors interactively, or see the exact state before and after each action.
+**Avoid when**: The failure is visible from the error message or trace alone.
+
+**TypeScript**
+```typescript
+// Launch Inspector from terminal:
+// PWDEBUG=1 npx playwright test tests/login.spec.ts
+
+// On Windows PowerShell:
+// $env:PWDEBUG=1; npx playwright test tests/login.spec.ts
+
+// On Windows CMD:
+// set PWDEBUG=1 && npx playwright test tests/login.spec.ts
+
+// Inspector opens automatically. Use these controls:
+// - "Step over" button: execute one action at a time
+// - "Pick locator" button: hover elements to see the best locator
+// - "Resume" button: run to the next page.pause() or end
+
+import { test, expect } from '@playwright/test';
+
+test('debug login flow', async ({ page }) => {
+  await page.goto('/login');
+
+  // Inspector pauses before each action when PWDEBUG=1
+  await page.getByLabel('Email').fill('user@example.com');
+  await page.getByLabel('Password').fill('password123');
+  await page.getByRole('button', { name: 'Sign in' }).click();
+
+  await expect(page.getByRole('heading', { name: 'Dashboard' })).toBeVisible();
+});
+```
+
+**JavaScript**
+```javascript
+// Launch Inspector from terminal:
+// PWDEBUG=1 npx playwright test tests/login.spec.js
+
+const { test, expect } = require('@playwright/test');
+
+test('debug login flow', async ({ page }) => {
+  await page.goto('/login');
+
+  await page.getByLabel('Email').fill('user@example.com');
+  await page.getByLabel('Password').fill('password123');
+  await page.getByRole('button', { name: 'Sign in' }).click();
+
+  await expect(page.getByRole('heading', { name: 'Dashboard' })).toBeVisible();
+});
+```
+
+### Pattern 3: Trace Viewer for CI Failure Analysis
+
+**Use when**: A test fails in CI and you need to understand what happened without re-running locally.
+**Avoid when**: You can reproduce the failure locally (use UI Mode or Inspector instead).
+
+**TypeScript**
+```typescript
+// playwright.config.ts — trace configuration
+import { defineConfig } from '@playwright/test';
+
+export default defineConfig({
+  retries: process.env.CI ? 2 : 0,
+  use: {
+    // 'on-first-retry' — captures trace on first retry only (recommended for CI)
+    // 'on' — captures every run (use temporarily for stubborn failures)
+    // 'retain-on-failure' — captures every run, keeps only failures
+    trace: 'on-first-retry',
+  },
+});
+
+// After CI failure, download the trace artifact and open it:
+// npx playwright show-trace test-results/tests-login-Login-test-chromium/trace.zip
+
+// Or open from URL:
+// npx playwright show-trace https://ci.example.com/artifacts/trace.zip
+
+// Or use trace.playwright.dev to view traces in the browser — drag and drop the zip file
+```
+
+**JavaScript**
+```javascript
+// playwright.config.js
+const { defineConfig } = require('@playwright/test');
+
+module.exports = defineConfig({
+  retries: process.env.CI ? 2 : 0,
+  use: {
+    trace: 'on-first-retry',
+  },
+});
+
+// After CI failure, download the trace artifact and open it:
+// npx playwright show-trace test-results/tests-login-Login-test-chromium/trace.zip
+```
+
+**Reading a trace — what to check in order:**
+
+1. **Actions tab** — see every Playwright action with before/after screenshots
+2. **Console tab** — browser console output (errors, warnings, logs)
+3. **Network tab** — every HTTP request with status, timing, request/response bodies
+4. **Source tab** — test source code highlighting the failing line
+5. **Call tab** — exact arguments and return values of each Playwright call
+
+### Pattern 3b: CLI Debugger for Agent Workflows
+
+**Use when**: You are debugging from a terminal, remote machine, or coding-agent workflow where opening the full inspector is awkward.
+**Avoid when**: You want the richest interactive UI locally; use UI Mode or Inspector for that.
+
+```bash
+# Start a paused debugging session
+npx playwright test --debug=cli
+
+# Attach from another terminal using the session id printed by Playwright
+playwright-cli attach tw-87b59e
+playwright-cli --session=tw-87b59e snapshot
+playwright-cli --session=tw-87b59e step-over
+playwright-cli --session=tw-87b59e console error
+```
+
+This flow is ideal when an agent or teammate needs to inspect the live browser state without leaving the command line.
+
+### Pattern 3c: Terminal Trace Analysis
+
+**Use when**: You have a trace archive but need fast answers from a shell, CI worker, or remote box.
+**Avoid when**: You need the full visual timeline; use Trace Viewer for that.
+
+```bash
+npx playwright trace open test-results/checkout-chromium/trace.zip
+npx playwright trace actions --grep="expect"
+npx playwright trace action 9
+npx playwright trace snapshot 9 --name after
+npx playwright trace close
+```
+
+This is especially helpful for agentic repair loops and flaky-test triage, where opening a GUI trace viewer adds friction.
+
+### Pattern 4: Headed Mode with Slow Motion
+
+**Use when**: You want to watch the browser during execution without the full Inspector overhead.
+**Avoid when**: The test runs too fast to follow even with slow-mo (use Inspector instead).
+
+**TypeScript**
+```typescript
+// From terminal — quick visual debugging:
+// npx playwright test tests/checkout.spec.ts --headed --slow-mo=500
+
+// playwright.config.ts — configure headed mode for local development
+import { defineConfig } from '@playwright/test';
+
+export default defineConfig({
+  use: {
+    // Do NOT commit these — use CLI flags or environment checks instead
+    headless: !process.env.HEADED,
+    launchOptions: {
+      slowMo: process.env.SLOW_MO ? parseInt(process.env.SLOW_MO) : 0,
+    },
+  },
+});
+
+// Then run:
+// HEADED=1 SLOW_MO=500 npx playwright test tests/checkout.spec.ts
+```
+
+**JavaScript**
+```javascript
+// From terminal:
+// npx playwright test tests/checkout.spec.js --headed --slow-mo=500
+
+// playwright.config.js
+const { defineConfig } = require('@playwright/test');
+
+module.exports = defineConfig({
+  use: {
+    headless: !process.env.HEADED,
+    launchOptions: {
+      slowMo: process.env.SLOW_MO ? parseInt(process.env.SLOW_MO) : 0,
+    },
+  },
+});
+```
+
+### Pattern 5: VS Code Integration
+
+**Use when**: You prefer IDE-based debugging with breakpoints, variable inspection, and integrated test running.
+**Avoid when**: You are debugging CI-only failures that do not reproduce locally.
+
+Install the **Playwright Test for VS Code** extension (`ms-playwright.playwright`).
+
+**Key capabilities:**
+- **Run/debug individual tests** — click the green play button in the gutter next to any `test()`
+- **Set breakpoints** — click the gutter to set breakpoints; tests pause at them automatically
+- **Pick locator** — use the "Pick locator" command to hover over elements and get the best selector
+- **Show browser** — check "Show Browser" in the testing sidebar to see the browser during execution
+- **Watch mode** — enable to re-run tests on file save
+
+**TypeScript**
+```typescript
+// When debugging in VS Code, use test.only() to focus on one test
+// instead of running the entire suite through the debugger
+import { test, expect } from '@playwright/test';
+
+test.only('debug this specific test', async ({ page }) => {
+  await page.goto('/products');
+
+  // Set a VS Code breakpoint on this line, then inspect `page` in the debug panel
+  const productCard = page.getByRole('listitem').filter({ hasText: 'Widget' });
+  await expect(productCard).toBeVisible();
+
+  await productCard.getByRole('button', { name: 'Add to cart' }).click();
+  await expect(page.getByTestId('cart-count')).toHaveText('1');
+});
+```
+
+**JavaScript**
+```javascript
+const { test, expect } = require('@playwright/test');
+
+test.only('debug this specific test', async ({ page }) => {
+  await page.goto('/products');
+
+  const productCard = page.getByRole('listitem').filter({ hasText: 'Widget' });
+  await expect(productCard).toBeVisible();
+
+  await productCard.getByRole('button', { name: 'Add to cart' }).click();
+  await expect(page.getByTestId('cart-count')).toHaveText('1');
+});
+```
+
+### Pattern 6: Capturing Browser Console Logs
+
+**Use when**: Suspecting JavaScript errors, failed client-side API calls, or application-level logging that explains the failure.
+**Avoid when**: The issue is clearly a selector or timing problem visible in the trace.
+
+**TypeScript**
+```typescript
+import { test, expect } from '@playwright/test';
+
+test('capture console output', async ({ page }) => {
+  // Collect all console messages
+  const consoleLogs: string[] = [];
+  page.on('console', (msg) => {
+    consoleLogs.push(`[${msg.type()}] ${msg.text()}`);
+  });
+
+  // Capture uncaught exceptions
+  page.on('pageerror', (error) => {
+    console.error('Page error:', error.message);
+  });
+
+  await page.goto('/dashboard');
+  await page.getByRole('button', { name: 'Load data' }).click();
+  await expect(page.getByRole('table')).toBeVisible();
+
+  // Print collected logs on failure for debugging context
+  console.log('Browser console output:', consoleLogs);
+});
+
+// Reusable fixture for console logging across all tests
+import { test as base } from '@playwright/test';
+
+type ConsoleFixtures = {
+  consoleMessages: string[];
+};
+
+export const test = base.extend<ConsoleFixtures>({
+  consoleMessages: async ({ page }, use) => {
+    const messages: string[] = [];
+    page.on('console', (msg) => messages.push(`[${msg.type()}] ${msg.text()}`));
+    page.on('pageerror', (err) => messages.push(`[pageerror] ${err.message}`));
+    await use(messages);
+  },
+});
+```
+
+**JavaScript**
+```javascript
+const { test, expect } = require('@playwright/test');
+
+test('capture console output', async ({ page }) => {
+  const consoleLogs = [];
+  page.on('console', (msg) => {
+    consoleLogs.push(`[${msg.type()}] ${msg.text()}`);
+  });
+
+  page.on('pageerror', (error) => {
+    console.error('Page error:', error.message);
+  });
+
+  await page.goto('/dashboard');
+  await page.getByRole('button', { name: 'Load data' }).click();
+  await expect(page.getByRole('table')).toBeVisible();
+
+  console.log('Browser console output:', consoleLogs);
+});
+
+// Reusable fixture for console logging
+const { test: base } = require('@playwright/test');
+
+const test = base.extend({
+  consoleMessages: async ({ page }, use) => {
+    const messages = [];
+    page.on('console', (msg) => messages.push(`[${msg.type()}] ${msg.text()}`));
+    page.on('pageerror', (err) => messages.push(`[pageerror] ${err.message}`));
+    await use(messages);
+  },
+});
+
+module.exports = { test };
+```
+
+### Pattern 7: Screenshots on Failure
+
+**Use when**: You need a visual snapshot at the exact moment of failure.
+**Avoid when**: Traces are enabled (they already include screenshots at every step).
+
+**TypeScript**
+```typescript
+// playwright.config.ts — automatic screenshots on failure
+import { defineConfig } from '@playwright/test';
+
+export default defineConfig({
+  use: {
+    // 'off' — no screenshots (default)
+    // 'on' — screenshot after every test
+    // 'only-on-failure' — screenshot only when test fails (recommended)
+    screenshot: 'only-on-failure',
+  },
+});
+```
+
+```typescript
+// Manual screenshot at a specific point
+import { test, expect } from '@playwright/test';
+
+test('debug visual state', async ({ page }) => {
+  await page.goto('/checkout');
+  await page.getByLabel('Promo code').fill('SAVE20');
+  await page.getByRole('button', { name: 'Apply' }).click();
+
+  // Capture screenshot before assertion for debugging
+  await page.screenshot({ path: 'test-results/before-discount.png', fullPage: true });
+
+  await expect(page.getByTestId('discount-amount')).toHaveText('-$20.00');
+});
+```
+
+**JavaScript**
+```javascript
+// playwright.config.js
+const { defineConfig } = require('@playwright/test');
+
+module.exports = defineConfig({
+  use: {
+    screenshot: 'only-on-failure',
+  },
+});
+```
+
+```javascript
+// Manual screenshot
+const { test, expect } = require('@playwright/test');
+
+test('debug visual state', async ({ page }) => {
+  await page.goto('/checkout');
+  await page.getByLabel('Promo code').fill('SAVE20');
+  await page.getByRole('button', { name: 'Apply' }).click();
+
+  await page.screenshot({ path: 'test-results/before-discount.png', fullPage: true });
+
+  await expect(page.getByTestId('discount-amount')).toHaveText('-$20.00');
+});
+```
+
+### Pattern 8: Network Debugging
+
+**Use when**: Suspecting API failures, wrong request payloads, missing auth headers, or slow responses causing timeouts.
+**Avoid when**: The trace network tab already shows the problem.
+
+**TypeScript**
+```typescript
+import { test, expect } from '@playwright/test';
+
+test('debug network requests', async ({ page }) => {
+  // Log all requests
+  page.on('request', (request) => {
+    console.log(`>> ${request.method()} ${request.url()}`);
+  });
+
+  // Log all responses with status
+  page.on('response', (response) => {
+    console.log(`<< ${response.status()} ${response.url()}`);
+  });
+
+  // Log failed requests (network errors, not HTTP errors)
+  page.on('requestfailed', (request) => {
+    console.log(`FAILED: ${request.url()} ${request.failure()?.errorText}`);
+  });
+
+  await page.goto('/dashboard');
+  await page.getByRole('button', { name: 'Refresh' }).click();
+  await expect(page.getByRole('table')).toBeVisible();
+});
+
+// Wait for a specific API response and inspect it
+test('inspect API response', async ({ page }) => {
+  await page.goto('/products');
+
+  const responsePromise = page.waitForResponse(
+    (resp) => resp.url().includes('/api/products') && resp.status() === 200
+  );
+
+  await page.getByRole('button', { name: 'Load products' }).click();
+
+  const response = await responsePromise;
+  const body = await response.json();
+  console.log('API response:', JSON.stringify(body, null, 2));
+
+  await expect(page.getByRole('listitem')).toHaveCount(body.products.length);
+});
+```
+
+**JavaScript**
+```javascript
+const { test, expect } = require('@playwright/test');
+
+test('debug network requests', async ({ page }) => {
+  page.on('request', (request) => {
+    console.log(`>> ${request.method()} ${request.url()}`);
+  });
+
+  page.on('response', (response) => {
+    console.log(`<< ${response.status()} ${response.url()}`);
+  });
+
+  page.on('requestfailed', (request) => {
+    console.log(`FAILED: ${request.url()} ${request.failure()?.errorText}`);
+  });
+
+  await page.goto('/dashboard');
+  await page.getByRole('button', { name: 'Refresh' }).click();
+  await expect(page.getByRole('table')).toBeVisible();
+});
+
+test('inspect API response', async ({ page }) => {
+  await page.goto('/products');
+
+  const responsePromise = page.waitForResponse(
+    (resp) => resp.url().includes('/api/products') && resp.status() === 200
+  );
+
+  await page.getByRole('button', { name: 'Load products' }).click();
+
+  const response = await responsePromise;
+  const body = await response.json();
+  console.log('API response:', JSON.stringify(body, null, 2));
+
+  await expect(page.getByRole('listitem')).toHaveCount(body.products.length);
+});
+```
+
+### Pattern 9: Verbose API Logs
+
+**Use when**: You need to see every single Playwright API call with timing to identify where the test is spending time or getting stuck.
+**Avoid when**: You already know which action is failing (use Inspector or `page.pause()` instead).
+
+```bash
+# See all Playwright API calls with timestamps
+DEBUG=pw:api npx playwright test tests/slow-test.spec.ts
+
+# See browser protocol messages (very verbose — use sparingly)
+DEBUG=pw:protocol npx playwright test tests/slow-test.spec.ts
+
+# Combine multiple debug channels
+DEBUG=pw:api,pw:browser npx playwright test tests/slow-test.spec.ts
+
+# Windows PowerShell
+$env:DEBUG="pw:api"; npx playwright test tests/slow-test.spec.ts
+
+# Windows CMD
+set DEBUG=pw:api && npx playwright test tests/slow-test.spec.ts
+```
+
+### Pattern 10: `page.pause()` — Inline Breakpoints
+
+**Use when**: You need to pause execution at a precise point to inspect the live DOM, try locators, or check application state.
+**Avoid when**: You can use `PWDEBUG=1` which pauses at every step automatically.
+
+**TypeScript**
+```typescript
+import { test, expect } from '@playwright/test';
+
+test('debug with pause', async ({ page }) => {
+  await page.goto('/checkout');
+  await page.getByLabel('Email').fill('user@example.com');
+
+  // Execution pauses here — Inspector opens with:
+  // - Live DOM inspection
+  // - Selector playground (try locators in the console)
+  // - Step through remaining actions
+  await page.pause();
+
+  // These actions wait until you click "Resume" in the Inspector
+  await page.getByRole('button', { name: 'Continue' }).click();
+  await expect(page.getByText('Order confirmed')).toBeVisible();
+});
+```
+
+**JavaScript**
+```javascript
+const { test, expect } = require('@playwright/test');
+
+test('debug with pause', async ({ page }) => {
+  await page.goto('/checkout');
+  await page.getByLabel('Email').fill('user@example.com');
+
+  // Execution pauses here — Inspector opens
+  await page.pause();
+
+  await page.getByRole('button', { name: 'Continue' }).click();
+  await expect(page.getByText('Order confirmed')).toBeVisible();
+});
+```
+
+**Important**: Remove `page.pause()` before committing. It will hang indefinitely in CI. Use this lint rule or CI check:
+
+```bash
+# Add to your pre-commit hook or CI pipeline
+grep -r "page.pause()" tests/ && echo "ERROR: Remove page.pause() before committing" && exit 1
+```
+
+## Decision Guide
+
+Use this table to pick the right tool based on the failure type.
+
+| Failure Type | First Tool | Why |
+|---|---|---|
+| **Element not found** (selector wrong) | UI Mode (`--ui`) | See the DOM at the moment of failure, try selectors in Pick Locator |
+| **Element not found** (timing issue) | Trace Viewer — Actions tab | Compare before/after screenshots to see if element appeared after timeout |
+| **Wrong text / value** | Trace Viewer — Actions tab | Inspect the actual DOM content at each action step |
+| **Test hangs / times out** | `DEBUG=pw:api` | See which API call is waiting and never resolving |
+| **Network / API failure** | Trace Viewer — Network tab | See request/response status codes, payloads, timing |
+| **Auth / session issues** | Network debugging (`page.on('response')`) | Check for 401/403 responses, missing cookies/tokens |
+| **Visual rendering wrong** | `--headed --slow-mo=500` | Watch the actual rendering in the browser |
+| **JavaScript error in app** | Console logging (`page.on('console')`) | Catch uncaught exceptions and error logs |
+| **CI-only failure** | Trace Viewer (from CI artifact) | Reproduce the exact CI state without running locally |
+| **Flaky / intermittent** | Trace on every run (`trace: 'on'`) + retries | Compare passing and failing traces side by side |
+| **State pollution** | Run single test with `test.only()` | Isolate from other tests; if it passes alone, state leaks from another test |
+
+## Anti-Patterns
+
+### Adding `waitForTimeout` to fix timing issues
+
+```typescript
+// WRONG — arbitrary delays mask the real problem and make tests slow and flaky
+await page.getByRole('button', { name: 'Submit' }).click();
+await page.waitForTimeout(3000); // "It works with this delay"
+await expect(page.getByText('Success')).toBeVisible();
+
+// RIGHT — wait for the actual condition
+await page.getByRole('button', { name: 'Submit' }).click();
+await expect(page.getByText('Success')).toBeVisible(); // Auto-retries for up to 5s
+```
+
+If the default timeout is insufficient, investigate *why* the operation is slow, then either:
+- Fix the application performance
+- Increase the specific assertion timeout: `await expect(locator).toBeVisible({ timeout: 15000 })`
+- Wait for a prerequisite: `await page.waitForResponse('**/api/submit')`
+
+### Commenting out tests to isolate a failure
+
+```typescript
+// WRONG — commenting out tests to find which one causes the failure
+// test('test A', ...);
+// test('test B', ...);
+test('test C — this one fails', async ({ page }) => { /* ... */ });
+
+// RIGHT — use .only to run a single test
+test.only('test C — this one fails', async ({ page }) => { /* ... */ });
+
+// RIGHT — use grep to run tests matching a pattern
+// npx playwright test --grep "test C"
+```
+
+### Not reading the full error message
+
+Playwright error messages include:
+- The **expected** vs **actual** value
+- The **locator** that was used
+- A **call log** showing what Playwright tried before timing out
+- The **line number** in your test
+
+Read all of it. The call log alone often shows exactly what went wrong (e.g., "waiting for selector to be visible" when the element exists but is hidden).
+
+### Debugging in CI without traces
+
+```typescript
+// WRONG — no traces in CI, no way to debug failures
+export default defineConfig({
+  use: {
+    trace: 'off',
+  },
+});
+
+// RIGHT — always capture traces on failure in CI
+export default defineConfig({
+  retries: process.env.CI ? 2 : 0,
+  use: {
+    trace: 'on-first-retry',
+  },
+});
+```
+
+### Using `console.log` instead of proper debugging tools
+
+```typescript
+// WRONG — sprinkling console.log everywhere
+test('debug with logs', async ({ page }) => {
+  await page.goto('/dashboard');
+  console.log('page loaded');
+  const el = page.getByRole('button', { name: 'Save' });
+  console.log('button found:', await el.isVisible());
+  console.log('button text:', await el.textContent());
+  // ...20 more console.log calls
+
+  // RIGHT — use page.pause() at the point of interest
+  await page.goto('/dashboard');
+  await page.pause(); // Inspect everything interactively
+});
+```
+
+### Leaving `page.pause()` or `test.only()` in committed code
+
+```typescript
+// WRONG — these should never reach CI
+test.only('focused test', async ({ page }) => {  // Skips all other tests
+  await page.goto('/');
+  await page.pause();  // Hangs forever in CI
+});
+
+// Add a CI guard if needed during development
+if (!process.env.CI) {
+  await page.pause();
+}
+```
+
+## Troubleshooting
+
+| Symptom | Likely Cause | Fix |
+|---|---|---|
+| Inspector does not open with `PWDEBUG=1` | Running in headless mode or workers > 1 | Run with `--headed` and `--workers=1` |
+| Trace is empty or missing | `trace: 'off'` in config, or test did not retry | Set `trace: 'on'` temporarily, or `trace: 'retain-on-failure'` |
+| UI Mode shows stale test results | File watcher did not pick up changes | Stop UI Mode, clear `test-results/`, restart |
+| `page.pause()` does nothing | `PWDEBUG` is not set and running headless | Run with `--headed` or set `PWDEBUG=1` |
+| Screenshots are blank or wrong size | Viewport not set or test runs on wrong project | Set `viewport` in config; check which browser project ran |
+| Verbose logs are overwhelming | Using `DEBUG=pw:protocol` | Use `DEBUG=pw:api` for a manageable level of detail |
+| Trace file is too large | `trace: 'on'` for all tests, including passing | Switch to `trace: 'on-first-retry'` or `trace: 'retain-on-failure'` |
+| VS Code does not detect tests | Wrong `testDir` or `testMatch` config | Ensure config paths match and extension settings point to your `playwright.config` |
+| Network events not firing | Request was made before listener was attached | Attach `page.on('request')` and `page.on('response')` before `page.goto()` |
+
+## Related
+
+- [core/error-index.md](error-index.md) — look up specific error messages
+- [core/flaky-tests.md](flaky-tests.md) — intermittent failure patterns and fixes
+- [core/common-pitfalls.md](common-pitfalls.md) — common beginner mistakes
+- [core/assertions-and-waiting.md](assertions-and-waiting.md) — web-first assertions and auto-waiting
+- [core/configuration.md](configuration.md) — trace, screenshot, and retry configuration
+- [ci/reporting-and-artifacts.md](../ci/reporting-and-artifacts.md) — CI artifact collection for traces and screenshots