E2E Testing

The Final Safety Net

E2E testing completes the Client-Server Alignment Strategy by testing the full user journey from browser to server and back.

Quick Overview

E2E tests validate:

• Complete form submission flows
• Client-server integration
• Real network requests
• Full user workflows

Basic Pattern

// e2e/registration.spec.ts
import { test, expect } from '@playwright/test';

test('user registration flow', async ({ page }) => {
	await page.goto('/register');

	await page.getByLabelText('Email').fill('[email protected]');
	await page.getByLabelText('Password').fill('secure123');
	await page.getByRole('button', { name: 'Register' }).click();

	// Tests the complete client-server integration
	await expect(page.getByText('Welcome!')).toBeVisible();
});

Why E2E Matters

• Catches client-server contract mismatches that unit tests miss
• Validates real form submissions with actual FormData
• Tests complete user workflows
• Provides confidence in production deployments

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This document will be expanded with comprehensive E2E patterns, configuration, and best practices.