liquid/test/futures.js

Node.js port of the Liquid template engine

const asyncResult = function (result, delay) {
  if (delay == null) { delay = 1 }
  return new Promise(function (resolve) {
    const onTimeout = () => resolve(result)
    return setTimeout(onTimeout, delay)
  })
}

describe('Futures', function () {
  it('are supported as simple variables', () => renderTest('worked', '{{ test }}', { test: asyncResult('worked') }))

  it('are supported as complex variables', () => renderTest('worked', '{{ test.text }}', { test: asyncResult({ text: 'worked' }) }))

  it('are supported as filter input', () => renderTest('WORKED', '{{ test | upcase }}', { test: asyncResult('worked') }))

  it('are supported as filter arguments', () =>
    renderTest('1-2-3', '{{ array | join:minus }}', {
      minus: asyncResult('-'),
      array: [1, 2, 3]
    })
  )

  it('are supported as filter arguments', () =>
    renderTest('1+2+3', '{{ array | join:minus | split:minus | join:plus }}', {
      minus: asyncResult('-'),
      plus: asyncResult('+'),
      array: [1, 2, 3]
    })
  )

  it('are supported in conditions', () =>
    renderTest('YES', '{% if test %}YES{% else %}NO{% endif %}',
      { test: asyncResult(true) })
  )

  it('are supported in captures', () =>
    renderTest('Monkeys&Monkeys', '{% capture heading %}{{animal}}{% endcapture %}{{heading}}&{{heading}}',
      { animal: asyncResult('Monkeys') })
  )

  it('are supported in assigns', () =>
    renderTest('YES', '{% assign test = var %}{% if test == 42 %}YES{% else %}NO{% endif %}',
      { var: asyncResult(42) })
  )

  return context('in for-loops', function () {
    it('are supported as lists', function () {
      const products = ([1, 2, 2].map((i) => ({ id: `item${i}` })))
      const doc = '{% for product in products %}- {{ product.id }}\n{% endfor %}'
      return renderTest('- item1\n- item2\n- item2\n', doc,
        { products: asyncResult(products) })
    })

    it('are supported as lists (with ifchanged)', function () {
      const products = ([1, 2, 2].map((i) => ({ id: `item${i}` })))
      const doc = '{% for product in products %}{% ifchanged %}- {{ product.id }}\n{% endifchanged %}{% endfor %}'
      return renderTest('- item1\n- item2\n', doc,
        { products: asyncResult(products) })
    })

    return it('are supported as elements', function () {
      const doc = '{% for product in products %}- {{ product.id }}\n{% endfor %}'
      const products = ([1, 2, 3].map((i) => ({ id: asyncResult(`item${i}`) })))

      return renderTest('- item1\n- item2\n- item3\n', doc,
        { products })
    })
  })
})