describe('ReaderTaskEither practical', () => {
  const config: AppConfig = {
    apiUrl: 'https://api.example.com',
    apiKey: 'secret',
    cache: { user1: { id: 1, name: 'Alice' } },
  }

  it('fetches from cache when available', async () => {
    const result = await fetchFromCache('user1')(config)()
    expect(E.isRight(result)).toBe(true)
    if (E.isRight(result)) {
      expect(result.right).toEqual({ id: 1, name: 'Alice' })
    }
  })

  it('fails when cache miss', async () => {
    const result = await fetchFromCache('user999')(config)()
    expect(E.isLeft(result)).toBe(true)
  })

  it('fetches from API with config', async () => {
    const result = await fetchFromApi('/users/1')(config)()
    expect(E.isRight(result)).toBe(true)
    if (E.isRight(result)) {
      expect(result.right).toEqual({ data: 'https://api.example.com/users/1' })
    }
  })

  it('uses fallback when cache misses', async () => {
    const result = await fetchWithFallback('user999', '/users/999')(config)()
    expect(E.isRight(result)).toBe(true)
    if (E.isRight(result)) {
      expect(result.right).toEqual({ data: 'https://api.example.com/users/999' })
    }
  })
})