Vuetify + Vue Test Utils + Jest + Stupid sync flag

README.md

If you remove {sync: false} from

const _mount = () => mount(TestComponent,  {sync: false});

in component.test.js, the test will break. If you keep it, everything is fine.

babel.config.js

module.exports = {
  presets: [
    [
      '@babel/preset-env',
      {
        targets: {
          node: 'current',
        },
      },
    ],
  ],
};

component.test.js

import TestComponent from './component.vue';
import {mount} from '@vue/test-utils';

import Vue from 'vue';
import Vuetify from 'vuetify';
Vue.use(Vuetify);

describe('test', () => {
  const _mount = () => mount(TestComponent,  {sync: false});
  const findForm = (wrapper) => wrapper.find({ref: 'form'});
  const findTextField = (wrapper) => wrapper.find({ref: 'textField'});

  const nextTickPromise = (wrapper) => new Promise(resolve => wrapper.vm.$nextTick(resolve));

  it('should be valid', async () => {
    // Given
    const wrapper = _mount();
    // When
    findTextField(wrapper).vm.$emit('input', 'testText');
    await nextTickPromise(wrapper);
    // Then

    expect(findForm(wrapper).vm.value).toEqual(true);
  });

  it('should ne invalid', () =>  {
    const wrapper = _mount();
    expect(findForm(wrapper).vm.value).toEqual(false);
  })
});

component.vue

<template>
  <v-form v-model="valid" ref="form">
    <v-text-field
      v-model="text"
      ref="textField"
      :rules="rules"/>
  </v-form>
</template>

<script>
  export default {
    data () {
      return {
        rules: [
          (v) => v.length > 0 || 'field required'
        ],
        text: '',
        valid: false
      }
    }
  }
</script>

jest.config.js

module.exports = {
  moduleFileExtensions: ["js", "json", "vue"],
  transform: {
      "^.+\\.js$": "babel-jest",
      "^.+\\.vue$": "vue-jest"
  }
}

package.json

{
  "name": "vuetify-form",
  "version": "1.0.0",
  "scripts": {
    "test": "jest"
  },
  "devDependencies": {
    "@babel/core": "^7.2.2",
    "@babel/preset-env": "^7.3.1",
    "@vue/test-utils": "^1.0.0-beta.29",
    "babel-core": "^7.0.0-bridge.0",
    "jest": "^24.1.0",
    "vue-jest": "^3.0.2",
    "vue-template-compiler": "^2.6.3"
  },
  "dependencies": {
    "vue": "^2.6.3",
    "vuetify": "^1.5.0"
  }
}