How do I install the E2e Testing skill?

Run npx get-skill add jakubmikolajek/e2e-testing in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

Is E2e Testing safe to use?

This skill has not completed SkillMD's automated safety review yet. Capability flags: reads secrets. SkillMD never runs a skill's scripts for you; review the SKILL.md before installing.

Which AI agents work with E2e Testing?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is E2e Testing free to use?

Yes. Installing skills from SkillMD is free, and the skill stays under its author's original license.

Who published E2e Testing?

JakubMikolajek (@jakubmikolajek) published this skill. Their other Agent Skills are listed on their SkillMD profile.

E2e Testing by jakubmikolajek — Agent Skill

Name: E2e Testing
Rating: 4.2 (5 reviews)
Author: JakubMikolajek

File contents

E2E Testing Patterns & Practices

Page Object Pattern

export class FeaturePage {
  constructor(readonly page: Page) {}
  get submitBtn() {
    return this.page.getByRole('button', { name: 'Submit' });
  }
  async navigate() { await this.page.goto('/feature'); }
}

Test Structure

test('should [behavior] when [condition]', async ({ page }) => {
  const id = `test-${Date.now()}-${test.info().parallelIndex}`;
  // Arrange → Act → Assert
});

Mocking (external APIs only)

await page.route('**/api/external/**', route => route.fulfill({ status: 200, body: '{}' }));

Verification Loop

RUN → FAIL? → DEBUG (browser_snapshot) → FIX → REPEAT

Rule	Limit
Max per test	5 iterations → `test.fixme()`
Max per suite	15 iterations → stop
Flaky detection	3 pass/fail mix → investigate
Stability	3+ consecutive passes required
App bug	Mark `test.fixme('BUG: desc')`

Error Recovery

Error	Action
Timeout	Increase once → check selector → check if element renders
Element not found	Alternative locator → check DOM → verify page loaded
Network	Retry → consider mock → verify backend
Flaky	Explicit waits → check race conditions → run 5x
App bug	Mark `test.fixme('BUG: desc')` - test is skipped; CI usually still passes unless skipped tests fail the build

CI Readiness Checklist

Passes in CI runner mode: <project e2e command>
Uses process.env.BASE_URL
No hardcoded credentials
Explicit viewport

Quick Reference

Always: accessible locators, unique test data, 3+ passes, mock external APIs Never: waitForTimeout(), CSS selectors, test interdependencies, hardcoded creds

---name: e2e-testingdescription: 'E2E testing patterns, verification procedures, and CI readiness checklists. Use for writing, debugging, or reviewing end-to-end tests, fixing flaky tests, creating Page Objects, and mocking external APIs.'metadata: source: https://skillmd.com/skills/jakubmikolajek/e2e-testing---# E2E Testing Patterns & Practices## Page Object Pattern```typescriptexport class FeaturePage { constructor(readonly page: Page) {} get submitBtn() { return this.page.getByRole('button', { name: 'Submit' }); } async navigate() { await this.page.goto('/feature'); }}```## Test Structure```typescripttest('should [behavior] when [condition]', async ({ page }) => { const id = `test-${Date.now()}-${test.info().parallelIndex}`; // Arrange → Act → Assert});```## Mocking (external APIs only)```typescriptawait page.route('**/api/external/**', route => route.fulfill({ status: 200, body: '{}' }));```## Verification Loop```RUN → FAIL? → DEBUG (browser_snapshot) → FIX → REPEAT```| Rule | Limit ||------|-------|| Max per test | 5 iterations → `test.fixme()` || Max per suite | 15 iterations → stop || Flaky detection | 3 pass/fail mix → investigate || Stability | 3+ consecutive passes required || App bug | Mark `test.fixme('BUG: desc')` |### Error Recovery| Error | Action ||-------|--------|| Timeout | Increase once → check selector → check if element renders || Element not found | Alternative locator → check DOM → verify page loaded || Network | Retry → consider mock → verify backend || Flaky | Explicit waits → check race conditions → run 5x || App bug | Mark `test.fixme('BUG: desc')` - test is skipped; CI usually still passes unless skipped tests fail the build |## CI Readiness Checklist- [ ] Passes in CI runner mode: `<project e2e command>`- [ ] Uses `process.env.BASE_URL`- [ ] No hardcoded credentials- [ ] Explicit viewport## Quick Reference**Always**: accessible locators, unique test data, 3+ passes, mock external APIs**Never**: `waitForTimeout()`, CSS selectors, test interdependencies, hardcoded creds

Frequently asked questions

E2e Testing