Testing Guide

Complete guide to testing in Lager Guru.

Overview

Testing ensures code quality and prevents regressions.

Testing Types

Unit Tests

Test individual functions and components in isolation.

Integration Tests

Test interactions between components and services.

E2E Tests

Test complete user workflows (to be implemented).

Running Tests

# Run all tests
npm test

# Run tests in watch mode
npm test -- --watch

# Run tests with coverage
npm test -- --coverage

Writing Tests

Component Tests

import { render, screen } from '@testing-library/react'
import { MyComponent } from './MyComponent'

test('renders component', () => {
  render(<MyComponent />)
  expect(screen.getByText('Hello')).toBeInTheDocument()
})

Hook Tests

import { renderHook } from '@testing-library/react'
import { useMyHook } from './useMyHook'

test('hook returns expected value', () => {
  const { result } = renderHook(() => useMyHook())
  expect(result.current).toBeDefined()
})

Test Coverage

Aim for:

• 80%+ code coverage
• All critical paths tested
• Edge cases covered

Best Practices

• Write tests before fixing bugs
• Test user interactions
• Mock external dependencies
• Keep tests fast and isolated
• Use descriptive test names

Next Steps

• Developer Onboarding
• Migrations Guide
• Code Standards