message: fix hydration tests
diff: import Vue from 'vue'
  import VNode from 'core/vdom/vnode'
  -import { SSR_ATTR } from 'shared/util'
  import { patch } from 'web/runtime/patch'
  +import { SSR_ATTR } from 'shared/constants'
  describe('vdom patch: hydration', () => {
  let vnode0
  