describe('ReaderTaskEither chain', () => {
  const env: Env = {
    users: {
      1: { id: 1, name: 'Alice', companyId: 10 },
      2: { id: 2, name: 'Bob', companyId: 20 },
    },
    companies: {
      10: { id: 10, name: 'Acme Corp' },
      20: { id: 20, name: 'Tech Inc' },
    },
  }

  it('fetches user with company', async () => {
    const result = await fetchUserWithCompany(1)(env)()
    expect(E.isRight(result)).toBe(true)
    if (E.isRight(result)) {
      expect(result.right).toEqual({ user: 'Alice', company: 'Acme Corp' })
    }
  })

  it('fails when user not found', async () => {
    const result = await fetchUserWithCompany(999)(env)()
    expect(E.isLeft(result)).toBe(true)
    if (E.isLeft(result)) {
      expect(result.left).toBe('User 999 not found')
    }
  })
})