import { describe, expect, it } from 'vitest'
import { isSyntheticEmail } from '../is-synthetic-email'

describe('isSyntheticEmail', () => {
  it('returns true for vk.local domain', () => {
    expect(isSyntheticEmail('vk_12345@vk.local')).toBe(true)
  })

  it('returns false for real email', () => {
    expect(isSyntheticEmail('user@gmail.com')).toBe(false)
  })

  it('returns false for yandex email', () => {
    expect(isSyntheticEmail('user@yandex.ru')).toBe(false)
  })

  it('returns false for empty string', () => {
    expect(isSyntheticEmail('')).toBe(false)
  })

  it('returns false for email with vk.local as part of username', () => {
    expect(isSyntheticEmail('vk.local@gmail.com')).toBe(false)
  })
})
