vue-test-utils v1.0.0-beta.22 broke my test

[joehecn]

Version

1.0.0-beta.22

Reproduction link

joehecn/j#6

What is expected?

I expect that everything will still be working as it used to

What is actually happening?

I does not work. Raising this error:

TypeError: Cannot read property '$el' of undefined
      76 |     cloneStoreConfig.state.curGroupMd5 = 'md5'
      77 |     const store = createStore(cloneStoreConfig)
    > 78 |     const wrapper = mount(Chat, {
         |                     ^
      79 |       mocks: { $$worker, $router },
      80 |       store,
      81 |       localVue
      at VueComponent.mounted (node_modules/element-ui/lib/element-ui.common.js:9126:54)
      at callHook (node_modules/vue/dist/vue.runtime.common.js:2919:21)
      at Object.insert (node_modules/vue/dist/vue.runtime.common.js:4156:7)
      at invokeInsertHook (node_modules/vue/dist/vue.runtime.common.js:5958:28)
      at VueComponent.patch [as __patch__] (node_modules/vue/dist/vue.runtime.common.js:6177:5)
      at VueComponent.Vue._update (node_modules/vue/dist/vue.runtime.common.js:2658:19)
      at VueComponent.updateComponent (node_modules/vue/dist/vue.runtime.common.js:2786:10)
      at Watcher.get (node_modules/vue/dist/vue.runtime.common.js:3140:25)
      at new Watcher (node_modules/vue/dist/vue.runtime.common.js:3129:12)
      at mountComponent (node_modules/vue/dist/vue.runtime.common.js:2793:3)
      at VueComponent.Object.<anonymous>.Vue.$mount (node_modules/vue/dist/vue.runtime.common.js:7997:10)
      at mount (node_modules/@vue/test-utils/dist/vue-test-utils.js:5543:21)
      at Object.test (__tests__/view/Chat.test.js:78:21)

Here's the full test code: https://travis-ci.org/joehecn/j/builds/409703349?utm_source=github_status&utm_medium=notification

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