chore: add playwright cursor skill

2026-05-12 17:22:38 +02:00 · 2026-05-10 04:19:55 +05:30 · 2026-05-10 04:19:55 +05:30 · d52225c18d
commit d52225c18d
parent 25aad38ca4
57 changed files with 25244 additions and 0 deletions
--- a/.cursor/skills/playwright-testing/debugging/debugging.md
+++ b/.cursor/skills/playwright-testing/debugging/debugging.md
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+# Debugging & Troubleshooting
+
+## Table of Contents
+
+1. [Debug Tools](#debug-tools)
+2. [Trace Viewer](#trace-viewer)
+3. [Identifying Flaky Tests](#identifying-flaky-tests)
+4. [Debugging Network Issues](#debugging-network-issues)
+5. [Debugging in CI](#debugging-in-ci)
+6. [Debugging Authentication](#debugging-authentication)
+7. [Debugging Screenshots](#debugging-screenshots)
+8. [Common Issues](#common-issues)
+9. [Logging](#logging)
+
+## Debug Tools
+
+### Playwright Inspector
+
+```bash
+# Run with inspector
+PWDEBUG=1 npx playwright test
+# Or specific test
+PWDEBUG=1 npx playwright test login.spec.ts
+```
+
+Features:
+
+- Step through test actions
+- Pick locators visually
+- Inspect DOM state
+- Edit and re-run
+
+### Headed Mode
+
+```bash
+# Run with visible browser
+npx playwright test --headed
+
+# Interactive debugging (headed, paused, step-through)
+npx playwright test --debug
+```
+
+You can also set `slowMo` to add an `N` ms delay per action, making test execution easier to follow while debugging.
+
+```typescript
+// playwright.config.ts
+export default defineConfig({
+  use: {
+    launchOptions: {
+      slowMo: 500,
+    },
+  },
+});
+```
+
+### UI Mode
+
+```bash
+# Interactive test runner
+npx playwright test --ui
+```
+
+Features:
+
+- Watch mode
+- Test timeline
+- DOM snapshots
+- Network logs
+- Console logs
+
+### Debug in Code
+
+```typescript
+test("debug example", async ({ page }) => {
+  await page.goto("/");
+
+  // Pause and open inspector
+  await page.pause();
+
+  // Continue test...
+  await page.click("button");
+});
+```
+
+## Trace Viewer
+
+### Enable Traces
+
+```typescript
+// playwright.config.ts
+export default defineConfig({
+  use: {
+    trace: "on-first-retry", // Record on retry
+    // trace: 'on',                 // Always record
+    // trace: 'retain-on-failure',  // Keep only failures
+  },
+});
+```
+
+### View Traces
+
+```bash
+# Open trace file
+npx playwright show-trace trace.zip
+
+# From test-results
+npx playwright show-trace test-results/test-name/trace.zip
+```
+
+### Trace Contents
+
+- Screenshots at each action
+- DOM snapshots
+- Network requests/responses
+- Console logs
+- Action timeline
+- Source code
+
+### Programmatic Traces
+
+```typescript
+test("manual trace", async ({ page, context }) => {
+  await context.tracing.start({ screenshots: true, snapshots: true });
+
+  await page.goto("/");
+  await page.click("button");
+
+  await context.tracing.stop({ path: "trace.zip" });
+});
+```
+
+## Identifying Flaky Tests
+
+If a test fails intermittently, it's likely flaky. Quick checks:
+
+| Behavior                               | Likely Cause                  | Next Step                              |
+| -------------------------------------- | ----------------------------- | -------------------------------------- |
+| Fails sometimes, passes other times    | Flaky - timing/race condition | [flaky-tests.md](flaky-tests.md)       |
+| Fails only with multiple workers       | Flaky - parallelism/isolation | [flaky-tests.md](flaky-tests.md)       |
+| Fails only in CI                       | Environment difference        | [CI Debugging](#debugging-in-ci) below |
+| Always fails                           | Bug in test or app            | Debug with tools above                 |
+| Always passes locally, always fails CI | CI-specific issue             | [ci-cd.md](../infrastructure-ci-cd/ci-cd.md)                   |
+
+> **For flaky test detection commands, root cause analysis, and fixing strategies**, see [flaky-tests.md](flaky-tests.md).
+
+## Debugging Network Issues
+
+### Monitor All Requests
+
+```typescript
+test("debug network", async ({ page }) => {
+  const requests: string[] = [];
+  const failures: string[] = [];
+
+  page.on("request", (req) => requests.push(`>> ${req.method()} ${req.url()}`));
+  page.on("requestfinished", (req) => {
+    const resp = req.response();
+    requests.push(`<< ${resp?.status()} ${req.url()}`);
+  });
+  page.on("requestfailed", (req) => {
+    failures.push(`FAILED: ${req.url()} - ${req.failure()?.errorText}`);
+  });
+
+  await page.goto("/dashboard");
+
+  // Log summary
+  console.log("Requests:", requests.length);
+  if (failures.length) console.log("Failures:", failures);
+});
+```
+
+### Wait for Specific API Response
+
+When debugging network-dependent issues, wait for specific API responses instead of arbitrary timeouts.
+
+```typescript
+// Start waiting BEFORE triggering the request
+const responsePromise = page.waitForResponse(
+  (resp) => resp.url().includes("/api/data") && resp.status() === 200,
+);
+await page.getByRole("button", { name: "Load" }).click();
+const response = await responsePromise;
+console.log("Status:", response.status());
+```
+
+> **For comprehensive waiting patterns** (navigation, element state, network, polling), see [assertions-waiting.md](../core/assertions-waiting.md#waiting-strategies).
+
+### Debug Slow Requests
+
+```typescript
+test("find slow requests", async ({ page }) => {
+  page.on("requestfinished", (request) => {
+    const timing = request.timing();
+    const total = timing.responseEnd - timing.requestStart;
+    if (total > 1000) {
+      console.log(`SLOW (${total}ms): ${request.url()}`);
+    }
+  });
+
+  await page.goto("/");
+});
+```
+
+## Debugging in CI
+
+### Simulate CI Locally
+
+```bash
+# Run in headless mode like CI
+CI=true npx playwright test
+
+# Match CI browser versions
+npx playwright install --with-deps
+
+# Run in Docker (same as CI)
+docker run --rm -v $(pwd):/work -w /work \
+  mcr.microsoft.com/playwright:v1.40.0-jammy \
+  npx playwright test
+```
+
+### CI-Specific Configuration
+
+```typescript
+// playwright.config.ts
+export default defineConfig({
+  // More artifacts in CI for debugging
+  use: {
+    trace: process.env.CI ? "on-first-retry" : "off",
+    video: process.env.CI ? "retain-on-failure" : "off",
+    screenshot: process.env.CI ? "only-on-failure" : "off",
+  },
+
+  // More retries in CI (but investigate failures!)
+  retries: process.env.CI ? 2 : 0,
+});
+```
+
+### Debug CI Environment
+
+```typescript
+test("CI environment check", async ({ page }, testInfo) => {
+  console.log("CI:", process.env.CI);
+  console.log("Project:", testInfo.project.name);
+  console.log("Worker:", testInfo.workerIndex);
+  console.log("Retry:", testInfo.retry);
+  console.log("Base URL:", testInfo.project.use.baseURL);
+
+  // Check viewport
+  const viewport = page.viewportSize();
+  console.log("Viewport:", viewport);
+});
+```
+
+## Debugging Authentication
+
+```typescript
+test("debug auth", async ({ page, context }) => {
+  // Inspect current storage state
+  const storage = await context.storageState();
+  console.log(
+    "Cookies:",
+    storage.cookies.map((c) => c.name),
+  );
+
+  // Check if auth cookies are present
+  const cookies = await context.cookies();
+  const authCookie = cookies.find((c) => c.name.includes("session"));
+  console.log("Auth cookie:", authCookie ? "present" : "MISSING");
+
+  await page.goto("/protected");
+
+  // Check if redirected to login (auth failed)
+  if (page.url().includes("/login")) {
+    console.error("Auth failed - redirected to login");
+    // Save state for inspection
+    await context.storageState({ path: "debug-auth.json" });
+  }
+});
+```
+
+## Debugging Screenshots
+
+### Compare Visual State
+
+```typescript
+test("visual debug", async ({ page }, testInfo) => {
+  await page.goto("/");
+
+  // Screenshot before action
+  await page.screenshot({
+    path: testInfo.outputPath("before.png"),
+    fullPage: true,
+  });
+
+  await page.getByRole("button", { name: "Open Menu" }).click();
+
+  // Screenshot after action
+  await page.screenshot({
+    path: testInfo.outputPath("after.png"),
+    fullPage: true,
+  });
+
+  // Attach to report
+  await testInfo.attach("before", {
+    path: testInfo.outputPath("before.png"),
+    contentType: "image/png",
+  });
+});
+```
+
+### Screenshot Specific Element
+
+```typescript
+test("element screenshot", async ({ page }) => {
+  await page.goto("/");
+
+  const element = page.getByTestId("problem-area");
+
+  // Screenshot just the element
+  await element.screenshot({ path: "element-debug.png" });
+
+  // Highlight element in full page screenshot
+  await element.evaluate((el) => (el.style.border = "3px solid red"));
+  await page.screenshot({ path: "highlighted.png" });
+});
+```
+
+## Common Issues
+
+### Element Not Found
+
+```typescript
+// Debug: Check if element exists
+console.log(await page.getByRole("button").count());
+
+// Debug: Log all buttons
+const buttons = await page.getByRole("button").all();
+for (const button of buttons) {
+  console.log(await button.textContent());
+}
+
+// Debug: Screenshot before action
+await page.screenshot({ path: "debug.png" });
+await page.getByRole("button").click();
+```
+
+### Timeout Issues
+
+```typescript
+// Increase timeout for slow operations
+await expect(page.getByText("Loaded")).toBeVisible({ timeout: 30000 });
+
+// Global timeout increase
+test.setTimeout(60000);
+
+// Check what's blocking
+test("debug timeout", async ({ page }) => {
+  await page.goto("/slow-page");
+
+  // Log network activity
+  page.on("request", (request) => console.log(">>", request.url()));
+  page.on("response", (response) =>
+    console.log("<<", response.url(), response.status()),
+  );
+});
+```
+
+### Selector Issues
+
+```typescript
+// Debug: Highlight element
+await page.getByRole("button").highlight();
+
+// Debug: Evaluate selector in browser console
+// Run in Inspector console:
+// playwright.locator('button').first().highlight()
+
+// Debug: Get element info
+const element = page.getByRole("button");
+console.log("Count:", await element.count());
+console.log("Visible:", await element.isVisible());
+console.log("Enabled:", await element.isEnabled());
+```
+
+### Frame Issues
+
+```typescript
+// Debug: List all frames
+for (const frame of page.frames()) {
+  console.log("Frame:", frame.url());
+}
+
+// Debug: Check if element is in iframe
+const frame = page.frameLocator("iframe").first();
+console.log(await frame.getByRole("button").count());
+```
+
+## Logging
+
+### Capture Browser Console
+
+```typescript
+test("with logging", async ({ page }) => {
+  page.on("console", (msg) => console.log("Browser:", msg.text()));
+  page.on("pageerror", (error) => console.log("Page error:", error.message));
+  await page.goto("/");
+});
+```
+
+> **For comprehensive console error handling** (fail on errors, allowed patterns, fixtures), see [console-errors.md](console-errors.md).
+
+### Custom Test Attachments
+
+```typescript
+test("with attachments", async ({ page }, testInfo) => {
+  // Attach screenshot to report
+  const screenshot = await page.screenshot();
+  await testInfo.attach("screenshot", {
+    body: screenshot,
+    contentType: "image/png",
+  });
+
+  // Attach logs or data
+  await testInfo.attach("logs", {
+    body: "Custom log data",
+    contentType: "text/plain",
+  });
+
+  // Use testInfo for output paths
+  const outputPath = testInfo.outputPath("debug-file.json");
+});
+```
+
+## Troubleshooting Checklist
+
+### By Symptom
+
+| Symptom                                       | Common Causes                                                | Quick Fixes                                                         | Reference                                                                  |
+| --------------------------------------------- | ------------------------------------------------------------ | ------------------------------------------------------------------- | -------------------------------------------------------------------------- |
+| **Element not found**                         | Wrong selector, element not visible, in iframe, timing issue | Check locator with Inspector, wait for visibility, use frameLocator | [locators.md](../core/locators.md), [assertions-waiting.md](../core/assertions-waiting.md) |
+| **Timeout errors**                            | Slow network, heavy page load, waiting for wrong condition   | Increase timeout, wait for specific response, check network tab     | [assertions-waiting.md](../core/assertions-waiting.md)                             |
+| **Flaky tests**                               | Race conditions, shared state, timing dependencies           | See comprehensive flaky test guide                                  | [flaky-tests.md](flaky-tests.md)                                           |
+| **Tests pass locally, fail in CI**            | Environment differences, missing dependencies, timing        | Simulate CI locally, check CI logs, verify environment vars         | [ci-cd.md](../infrastructure-ci-cd/ci-cd.md), [flaky-tests.md](flaky-tests.md)                     |
+| **Slow test execution**                       | Not parallelized, heavy network calls, unnecessary waits     | Enable parallelization, mock APIs, optimize waits                   | [performance.md](../infrastructure-ci-cd/performance.md)                                           |
+| **Selector works in browser but not in test** | Element not attached, wrong context, dynamic content         | Use auto-waiting, check iframe, verify element state                | [locators.md](../core/locators.md)                                                 |
+| **Test fails on retry**                       | Non-deterministic data, external dependencies                | Use test data fixtures, mock external services                      | [fixtures-hooks.md](../core/fixtures-hooks.md)                                     |
+
+### Step-by-Step Debugging Process
+
+1. **Reproduce the issue**
+
+   ```bash
+   # Run with trace enabled
+   npx playwright test tests/failing.spec.ts --trace on
+
+   # If intermittent, run multiple times
+   npx playwright test --repeat-each=10
+   ```
+
+2. **Inspect the failure**
+
+   ```bash
+   # View trace
+   npx playwright show-trace test-results/path-to-trace.zip
+
+   # Run in headed mode to watch
+   npx playwright test --headed
+
+   # Use inspector for step-by-step
+   PWDEBUG=1 npx playwright test
+   ```
+
+3. **Isolate the problem**
+
+   ```typescript
+   // Add debugging points
+   await page.pause();
+
+   // Log element state
+   console.log("Element count:", await page.getByRole("button").count());
+   console.log("Element visible:", await page.getByRole("button").isVisible());
+
+   // Take screenshot at failure point
+   await page.screenshot({ path: "debug.png" });
+   ```
+
+4. **Check related areas**
+   - Network requests: Are API calls completing? (see [Debugging Network Issues](#debugging-network-issues))
+   - Timing: Is auto-waiting working correctly?
+   - State: Is the test isolated? (see [flaky-tests.md](flaky-tests.md))
+   - Environment: Does it work locally but fail in CI? (see [Debugging in CI](#debugging-in-ci))
+
+5. **Apply fix and verify**
+   - Fix the root cause (not just symptoms)
+   - Run multiple times to confirm stability: `--repeat-each=10`
+   - Check related tests aren't affected
+
+## Related References
+
+- **Flaky tests**: See [flaky-tests.md](flaky-tests.md) for comprehensive flaky test guide
+- **Locator issues**: See [locators.md](../core/locators.md) for selector strategies
+- **Waiting problems**: See [assertions-waiting.md](../core/assertions-waiting.md) for waiting patterns
+- **Test isolation**: See [fixtures-hooks.md](../core/fixtures-hooks.md) for fixtures and isolation
+- **CI issues**: See [ci-cd.md](../infrastructure-ci-cd/ci-cd.md) for CI configuration