Testing
Test your Wails application
Overview
Testing ensures your application works correctly and prevents regressions.
Unit Testing
Testing Services
go
func TestUserService_Create(t *testing.T) {
service := &UserService{
users: make(map[string]*User),
}
user, err := service.Create("john@example.com", "password123")
if err != nil {
t.Fatalf("unexpected error: %v", err)
}
if user.Email != "john@example.com" {
t.Errorf("expected email john@example.com, got %s", user.Email)
}
}Testing with Mocks
go
type MockDB struct {
users map[string]*User
}
func (m *MockDB) Create(user *User) error {
m.users[user.ID] = user
return nil
}
func TestUserService_WithMock(t *testing.T) {
mockDB := &MockDB{users: make(map[string]*User)}
service := &UserService{db: mockDB}
user, err := service.Create("test@example.com", "pass")
if err != nil {
t.Fatal(err)
}
if len(mockDB.users) != 1 {
t.Error("expected 1 user in mock")
}
}Integration Testing
Testing with Real Dependencies
go
func TestIntegration(t *testing.T) {
// Setup test database
db, err := sql.Open("sqlite3", ":memory:")
if err != nil {
t.Fatal(err)
}
defer db.Close()
// Create schema
_, err = db.Exec(`CREATE TABLE users (...)`)
if err != nil {
t.Fatal(err)
}
// Test service
service := &UserService{db: db}
user, err := service.Create("test@example.com", "password")
if err != nil {
t.Fatal(err)
}
// Verify in database
var count int
db.QueryRow("SELECT COUNT(*) FROM users").Scan(&count)
if count != 1 {
t.Errorf("expected 1 user, got %d", count)
}
}Frontend Testing
JavaScript Unit Tests
javascript
// Using Vitest
import { describe, it, expect } from 'vitest'
import { formatDate } from './utils'
describe('formatDate', () => {
it('formats date correctly', () => {
const date = new Date('2024-01-01')
expect(formatDate(date)).toBe('2024-01-01')
})
})Testing Bindings
javascript
import { vi } from 'vitest'
import { GetUser } from './bindings/changeme/userservice'
// Mock the binding
vi.mock('./bindings/changeme/userservice', () => ({
GetUser: vi.fn()
}))
describe('User Component', () => {
it('loads user data', async () => {
GetUser.mockResolvedValue({ name: 'John', email: 'john@example.com' })
// Test your component
const user = await GetUser(1)
expect(user.name).toBe('John')
})
})Best Practices
✅ Do
- Write tests before fixing bugs
- Test edge cases
- Use table-driven tests
- Mock external dependencies
- Test error handling
- Keep tests fast
❌ Don’t
- Don’t skip error cases
- Don’t test implementation details
- Don’t write flaky tests
- Don’t ignore test failures
- Don’t skip integration tests
Running Tests
bash
# Run Go tests
go test ./...
# Run with coverage
go test -cover ./...
# Run specific test
go test -run TestUserService
# Run frontend tests
cd frontend && npm test
# Run with watch mode
cd frontend && npm test -- --watch
Next Steps
- End-to-End Testing - Test complete user flows
- Best Practices - Learn best practices