Unit Testing Event Listeners

Notes Used to Craft this Lesson

If you'll recall, our welcome email is being sent via an event listener.

// app/services/user_service.ts
export default class UserService {
  /**
   * Sends a welcome email to the user.
   * The email is sent asynchronously and will not block the execution of the current code.
   * @param data - An object containing the user's full name and email address
   * @returns A promise resolving when the email is sent
   */
  async sendWelcomeEmail(data: { fullName: string | null; email: string }) {
++    await emitter.emit('mail:send_welcome_email', data)
  }
}