Integration Testing

Integration Testing

Learn how to test component interactions, API integration, state management, and complex user workflows

Integration Testing Categories

Component Integration

Testing how multiple components work together

  • Form + Input + Button workflows
  • Modal + Form interactions
  • Calculator + State management
  • Navigation + Routing integration

API Integration

Frontend-backend communication testing

  • SvelteKit API routes testing
  • Form action integration
  • Error handling workflows
  • Authentication flows

State Management

Testing reactive state across components

  • Svelte 5 runes integration
  • Cross-component state sharing
  • Store subscriptions
  • State persistence

Form Workflows

Multi-step form testing patterns

  • Multi-step form wizards
  • Validation workflows
  • Form submission flows
  • Error recovery patterns

Interactive Examples

Code Example

// login-form.integration.test.ts
import { render } from 'vitest-browser-svelte';
import { page } from 'vitest-browser/context';
import { expect, test } from 'vitest';
import LoginForm from './login-form.svelte';

test('should handle complete login flow', async () => {
  render(LoginForm);
  
  // Fill form
  await page.getByRole('textbox', { name: /email/i }).fill('[email protected]');
  await page.getByRole('textbox', { name: /password/i }).fill('password123');
  
  // Submit
  await page.getByRole('button', { name: /sign in/i }).click();
  
  // Verify success
  await expect.element(page.getByText('Welcome back!')).toBeVisible();
});

Key Concepts

  • Component Workflows: Test complete user interactions across multiple components
  • Event Propagation: Verify events flow correctly between parent and child components
  • State Synchronization: Ensure shared state updates consistently across components

Integration Testing Best Practices

Test Real User Workflows

Focus on complete user journeys rather than isolated components

Mock External Dependencies

Use realistic mocks for APIs and external services

Test Error Scenarios

Verify graceful handling of failures and edge cases

Validate State Consistency

Ensure state remains consistent across component boundaries

Real-World Examples

Todo Manager Integration

See integration testing in action with our Todo Manager example, featuring form actions, state management, and component interactions.

View Tests Try Demo

Component Showcase

Explore component integration patterns with our interactive component showcase, featuring live demos and testing examples.

View Components Unit Tests

Ready for End-to-End Testing?

Take your testing to the next level with comprehensive E2E testing patterns and real browser automation

E2E Testing Examples View Documentation