test-data-generator

Test Data Generator

Generate test data, fixtures, and mocks for testing.

Quick Start

Create a simple fixture:

const mockUser = {
  id: 1,
  name: 'Test User',
  email: '[email protected]'
}

Instructions

Factory Functions

Create reusable data generators:

function createUser(overrides = {}) {
  return {
    id: Math.floor(Math.random() * 1000),
    name: 'Test User',
    email: '[email protected]',
    role: 'user',
    createdAt: new Date().toISOString(),
    ...overrides
  }
}

// Usage
const admin = createUser({ role: 'admin', name: 'Admin User' })
const regularUser = createUser()

def create_user(**kwargs):
    defaults = {
        'id': random.randint(1, 1000),
        'name': 'Test User',
        'email': '[email protected]',
        'role': 'user',
        'created_at': datetime.now()
    }
    return {**defaults, **kwargs}

# Usage
admin = create_user(role='admin', name='Admin User')

Builder Pattern

For complex objects:

class UserBuilder {
  constructor() {
    this.user = {
      id: 1,
      name: 'Test User',
      email: '[email protected]',
      role: 'user',
      preferences: {}
    }
  }
  
  withId(id) {
    this.user.id = id
    return this
  }
  
  withName(name) {
    this.user.name = name
    return this
  }
  
  withRole(role) {
    this.user.role = role
    return this
  }
  
  withPreferences(preferences) {
    this.user.preferences = preferences
    return this
  }
  
  build() {
    return this.user
  }
}

// Usage
const user = new UserBuilder()
  .withId(123)
  .withName('John Doe')
  .withRole('admin')
  .withPreferences({ theme: 'dark' })
  .build()

Test Fixtures

JavaScript/TypeScript:

// fixtures/users.js
export const users = {
  admin: {
    id: 1,
    name: 'Admin User',
    email: '[email protected]',
    role: 'admin'
  },
  regular: {
    id: 2,
    name: 'Regular User',
    email: '[email protected]',
    role: 'user'
  }
}

// In tests
import { users } from './fixtures/users'

test('admin can delete posts', () => {
  expect(canDelete(users.admin)).toBe(true)
})