core/packages/runtime-core/__tests__/directives.spec.ts

import {
  h,
  applyDirectives,
  ref,
  render,
  nodeOps,
  DirectiveHook,
  VNode,
  DirectiveBinding,
  nextTick
} from '@vue/runtime-test'
import { currentInstance, ComponentInternalInstance } from '../src/component'

describe('directives', () => {
  it('should work', async () => {
    const count = ref(0)

    function assertBindings(binding: DirectiveBinding) {
      expect(binding.value).toBe(count.value)
      expect(binding.arg).toBe('foo')
      expect(binding.instance).toBe(_instance && _instance.renderProxy)
      expect(binding.modifiers && binding.modifiers.ok).toBe(true)
    }

    const beforeMount = jest.fn(((el, binding, vnode, prevVNode) => {
      expect(el.tag).toBe('div')
      // should not be inserted yet
      expect(el.parentNode).toBe(null)
      expect(root.children.length).toBe(0)

      assertBindings(binding)

      expect(vnode).toBe(_vnode)
      expect(prevVNode).toBe(null)
    }) as DirectiveHook)

    const mounted = jest.fn(((el, binding, vnode, prevVNode) => {
      expect(el.tag).toBe('div')
      // should be inserted now
      expect(el.parentNode).toBe(root)
      expect(root.children[0]).toBe(el)

      assertBindings(binding)

      expect(vnode).toBe(_vnode)
      expect(prevVNode).toBe(null)
    }) as DirectiveHook)

    const beforeUpdate = jest.fn(((el, binding, vnode, prevVNode) => {
      expect(el.tag).toBe('div')
      expect(el.parentNode).toBe(root)
      expect(root.children[0]).toBe(el)

      // node should not have been updated yet
      expect(el.children[0].text).toBe(`${count.value - 1}`)

      assertBindings(binding)

      expect(vnode).toBe(_vnode)
      expect(prevVNode).toBe(_prevVnode)
    }) as DirectiveHook)

    const updated = jest.fn(((el, binding, vnode, prevVNode) => {
      expect(el.tag).toBe('div')
      expect(el.parentNode).toBe(root)
      expect(root.children[0]).toBe(el)

      // node should have been updated
      expect(el.children[0].text).toBe(`${count.value}`)

      assertBindings(binding)

      expect(vnode).toBe(_vnode)
      expect(prevVNode).toBe(_prevVnode)
    }) as DirectiveHook)

    const beforeUnmount = jest.fn(((el, binding, vnode, prevVNode) => {
      expect(el.tag).toBe('div')
      // should be removed now
      expect(el.parentNode).toBe(root)
      expect(root.children[0]).toBe(el)

      assertBindings(binding)

      expect(vnode).toBe(_vnode)
      expect(prevVNode).toBe(null)
    }) as DirectiveHook)

    const unmounted = jest.fn(((el, binding, vnode, prevVNode) => {
      expect(el.tag).toBe('div')
      // should have been removed
      expect(el.parentNode).toBe(null)
      expect(root.children.length).toBe(0)

      assertBindings(binding)

      expect(vnode).toBe(_vnode)
      expect(prevVNode).toBe(null)
    }) as DirectiveHook)

    let _instance: ComponentInternalInstance | null = null
    let _vnode: VNode | null = null
    let _prevVnode: VNode | null = null
    const Comp = {
      setup() {
        _instance = currentInstance
      },
      render() {
        _prevVnode = _vnode
        _vnode = applyDirectives(h('div', count.value), [
          [
            {
              beforeMount,
              mounted,
              beforeUpdate,
              updated,
              beforeUnmount,
              unmounted
            },
            // value
            count.value,
            // argument
            'foo',
            // modifiers
            { ok: true }
          ]
        ])
        return _vnode
      }
    }

    const root = nodeOps.createElement('div')
    render(h(Comp), root)

    expect(beforeMount).toHaveBeenCalled()
    expect(mounted).toHaveBeenCalled()

    count.value++
    await nextTick()
    expect(beforeUpdate).toHaveBeenCalled()
    expect(updated).toHaveBeenCalled()

    render(null, root)
    expect(beforeUnmount).toHaveBeenCalled()
    expect(unmounted).toHaveBeenCalled()
  })
})