cezar: Skill for Claude Code

e2e: agentic end-to-end tests in TypeScript

e2e runs UI tests with agent goals and exact assertions. agent.act drives one goal; agent.assert, agent.waitFor, and agent.extract judge the screen. screen, app, browser, and expect make exact interactions and checks. The replay cache reruns verified actions and checks their recorded end state without a model call; agent judgments still run live. UI targets use @e2e-dev/web for browsers or @e2e-dev/mobile for iOS simulators, Android emulators, and connected phones. A test that takes only app can check an API with fetch and expect (topic writing-tests). Model sign-in commands are in setup.

// e2e.config.ts
import type { E2EConfig } from 'e2e';
import { web } from '@e2e-dev/web';
import { gateway } from 'ai';

export default {
  targets: [
    {
      engine: web(),
      app: {
        url: 'http://127.0.0.1:3000',
        command: { executable: 'pnpm', args: ['dev'], log: '.e2e/logs/app.log' },
      },
    },
  ],
  // The model behind every agent.* step: an AI SDK instance; gateway() from 'ai' reads AI_GATEWAY_API_KEY or a Vercel OIDC token.
  agents: {
    default: {
      model: gateway('openai/gpt-6-luna-fast'),
      system: 'You are a thorough QA agent. Verify every outcome on screen.',
    },
  },
} satisfies E2EConfig;

// tests/billing.e2e.ts
import { test } from '@e2e-dev/web';
import { expect } from 'e2e';

test('a member upgrades to Pro', async ({ app, agent, screen, browser }) => {
  await app.open('/settings/billing');
  await agent.act('upgrade the workspace to the Pro plan');
  await expect(screen.getByRole('status')).toContainText('Pro');
  await expect(browser).toHaveURL('/settings/billing');
});

Topics

Read the topic for the job before writing code. The files sit next to this one; the installed CLI prints the same text with npx e2e guide <topic> (e2e guide alone prints this page). For anything the topics do not cover, the full documentation ships in the docs/ directory of the installed e2e package (node_modules/e2e/docs in a single-package project); a link such as /reference/cli is docs/reference/cli.mdx. Complete projects for Vite, Next.js, Astro, Expo, SwiftUI, Jetpack Compose, Kotlin Multiplatform, and Flutter, each with its config, scripts, and a passing suite, are in https://github.com/tester-army/e2e/tree/main/examples.