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pipe(

  value => value, // Identity

  value => Promise.resolve(value), // Promise wrapped identity

  value -> 2 * value, // multiplyBy2

  async value => 2 * value // asyncMultiplyBy2

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function pipe (...fns) {
  return input => fns.reduce(async (previousOutput, fn) => fn(await previousOutput), input)
}

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{
    const actual = pipe(addTwo, identity, multiplyByThree)(1)
    const expected = 9
    const msg = 'passing functions that do simple math operations'
    deepEqual(actual, expected, msg)
}
{
    const actual = pipe(addTwo, identity, multiplyByThree)(1)
    const expected = multiplyByThree(identity(addTwo(1)))
    const msg = 'functions passed should be able to be composed and produce same output'

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function pipe (...fns) {
  return input => fns.reduce((previousOutput, fn) => fn(previousOutput), input)
}

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{
    const actual = pipe(identity, identity, identity)(1)
    const expected = 1
    const msg = 'passing identity n times should return unmodified value'
    deepEqual(actual, expected, msg)
}

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module.exports = {
  pipe
}

function pipe (fn) {
  return value => fn(value)
}

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const test = require('tape')

test('pipe', function ({ deepEqual, end }) {
  const identity = value => value
  const actual = pipe(identity)(1)
  const expected = 1
  const msg = 'passing just identity should return unmodified value'
  deepEqual(actual, expected, msg)
  end()
})

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app.get('/stores', (req, res) => {
  const responseBody = pipe(
    composeRequest
    makeRequest,
    composeResponse
  )(req.body)
  res.json(responseBody)
})

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const { BeforeAll, AfterAll } = require('cucumber')
const spawn = require('child_process').spawn
const path = require('path')
const processes = []

BeforeAll(async function () {
  /* start up any process before running any test */
  processes.push(await runServer('app'))
})

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const express = require('express')
const app = express()
const port = process.env.PORT || 3000

app.get('/stores', (req, res) => res.json({ name: 'hello world' }))

app.listen(port, () => console.log(`app magic happens on port ${port}`))