import { expect } from 'chai'
import Liquid from '../../../src/liquid'

describe('drop/null-drop', function () {
  let liquid: Liquid
  before(() => (liquid = new Liquid()))

  it('render nil as empty string', async function () {
    const html = await liquid.parseAndRender('{{nil}}')
    expect(html).to.equal('')
  })
  it('render null as empty string', async function () {
    const html = await liquid.parseAndRender('{{null}}')
    expect(html).to.equal('')
  })
  it('undefined variable should equal to null', async function () {
    const src = '{%if foo == nil %}foo == nil{%else%}foo != nil{% endif %}'
    const html = await liquid.parseAndRender(src)
    expect(html).to.equal('foo == nil')
  })
  it('nil equals blank', async function () {
    const src = '{%if nil == blank %}nil == blank{%else%}nil != blank{% endif %}'
    const html = await liquid.parseAndRender(src)
    expect(html).to.equal('nil == blank')
  })
  it('0 should not equal to null', async function () {
    const src = '{%if 0 == null %}0 == null{%else%}0 != null{% endif %}'
    const html = await liquid.parseAndRender(src)
    expect(html).to.equal('0 != null')
  })
  it('nil should equal to null', async function () {
    const src = '{%if nil == null %}nil == null{%else%}nil != null{% endif %}'
    const html = await liquid.parseAndRender(src)
    expect(html).to.equal('nil == null')
  })
})