describe('TaskEither API operations', () => {
  it('fetches user successfully', async () => {
    const result = await fetchUser(1)()
    expect(result._tag).toBe('Right')
    if (result._tag === 'Right') {
      expect(result.right.id).toBe(1)
      expect(result.right.name).toBe('User 1')
    }
  })

  it('handles API error', async () => {
    const result = await fetchUser(0)()
    expect(result._tag).toBe('Left')
    if (result._tag === 'Left') {
      expect(result.left.status).toBe(404)
    }
  })

  it('updates user email', async () => {
    const result = await updateUserEmail(1, 'newemail@example.com')()
    expect(result._tag).toBe('Right')
    if (result._tag === 'Right') {
      expect(result.right.email).toBe('newemail@example.com')
    }
  })
})