Test Data Factory Builder

Create composable factories for consistent test data.

Factory Pattern

// factories/UserFactory.ts
import { faker } from "@faker-js/faker";

export class UserFactory {
  private data: Partial<User> = {};

  static create(overrides?: Partial<User>): User {
    return new UserFactory().with(overrides).build();
  }

  with(overrides: Partial<User>): this {
    this.data = { ...this.data, ...overrides };