text: const addStylesClient = require('../lib/addStylesClient')
  const addStylesServer = require('../lib/addStylesServer')
  
  const mockedList = [
    [1, 'h1 { color: red; }', ''],
    [1, 'p { color: green; }', ''],
    [2, 'span { color: blue; }', ''],
    [2, 'span { color: blue; }', 'print']
  ]
  
  test('addStylesClient (dev)', () => {
    const update = addStylesClient('foo', mockedList, false)
    assertStylesMatch(mockedList)
    const mockedList2 = mockedList.slice(1, 3)
    update(mockedList2)
    assertStylesMatch(mockedList2)
    update()
    expect(document.querySelectorAll('style').length).toBe(0)
  })
  
  test('addStylesClient (prod)', () => {
    const update = addStylesClient('foo', mockedList, true)
    assertStylesMatch(mockedList)
    const mockedList2 = mockedList.slice(2)
    update(mockedList2)
    assertStylesMatch(mockedList2)
    update()
    expect(document.querySelectorAll('style').length).toBe(0)
  })
  
  test('addStylesClient (dev + ssr)', () => {
    mockSSRTags(mockedList, 'foo')
    const update = addStylesClient('foo', mockedList, false)
    assertStylesMatch(mockedList)
    update()
    expect(document.querySelectorAll('style').length).toBe(0)
  })
  
  test('addStylesClient (prod + ssr)', () => {
    mockProdSSRTags(mockedList, 'foo')
    const update = addStylesClient('foo', mockedList, true)
    expect(document.querySelectorAll('style').length).toBe(1)
  })
  
  test('addStylesServer (dev)', () => {
    const context = global.__REACT_SSR_CONTEXT__ = {}
    addStylesServer('foo', mockedList, false)
    expect(context.styles).toBe(
      `<style data-react-ssr-id="foo:0">h1 { color: red; }</style>` +
      `<style data-react-ssr-id="foo:1">p { color: green; }</style>` +
      `<style data-react-ssr-id="foo:2">span { color: blue; }</style>` +
      `<style data-react-ssr-id="foo:3" media="print">span { color: blue; }</style>`
    )
  })
  
  test('addStylesServer (prod)', () => {
    const context = global.__REACT_SSR_CONTEXT__ = {}
    addStylesServer('foo', mockedList, true)
    expect(context.styles).toBe(
      `<style data-react-ssr-id="foo:0 foo:1 foo:2">` +
        `h1 { color: red; }\np { color: green; }\nspan { color: blue; }` +
      `</style>` +
      `<style data-react-ssr-id="foo:3" media="print">span { color: blue; }</style>`
    )
  })
  
  // --- helpers ---
  
  function assertStylesMatch (list) {
    const styles = document.querySelectorAll('style')
    expect(styles.length).toBe(list.length)
    ;[].forEach.call(styles, (style, i) => {
      expect(style.textContent.indexOf(list[i][1]) > -1).toBe(true)
    })
  }
  
  function mockSSRTags (list, parentId) {
    list.forEach((item, i) => {
      const style = document.createElement('style')
      style.setAttribute('data-react-ssr-id', `${parentId}:${i}`)
      style.textContent = item[1]
      if (item[2]) {
        style.setAttribute('media', item[2])
      }
      document.head.appendChild(style)
    })
  }
  
  function mockProdSSRTags (list, parentId) {
    const style = document.createElement('style')
    style.setAttribute('data-react-ssr-id', list.map((item, i) => `${parentId}:${i}`).join(' '))
    style.textContent = list.map(item => item[1]).join('\n')
    document.head.appendChild(style)
  }
  