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Backend Integration Tests: - Create IntegrationTestBase class with WebApplicationFactory - AuthIntegrationTests: Registration, login, validation tests (5 tests) - EventsIntegrationTests: CRUD operations, authorization tests (8 tests) Frontend-Backend Integration (E2E): - Install Playwright with Chromium - Create playwright.config.ts with configuration - Auth E2E tests: login/register page visibility, navigation - Event List E2E tests: page display - Navigation E2E tests: main page navigation flow Total Integration Tests: - Backend: 13 tests covering Auth and Events - E2E: 6 tests covering UI flows