[Bug Report] TypeError: Cannot read property 'rtl' of undefined when testing a component with v-date-picker.

Versions and Environment

Vuetify: 1.4.0 Vue: 2.5.21 Browsers: Chrome 70.0.3538.110 OS: Mac OS 10.13.6

Steps to reproduce

1. Create a new vue project: vue create test

2. pick these options:

Please pick a preset: Manually select features
? Check the features needed for your project: Babel, TS, Linter, Unit
? Use class-style component syntax? Yes
? Use Babel alongside TypeScript for auto-detected polyfills? Yes
? Pick a linter / formatter config: TSLint
? Pick additional lint features: Lint on save
? Pick a unit testing solution: Jest
? Where do you prefer placing config for Babel, PostCSS, ESLint, etc.? In package.json
? Save this as a preset for future projects? No

1. add vuetify cd test && vue add vuetify

2. replace everything in /components/HelloWorld.vue with this:

<template>
    <v-date-picker/>
</template>

1. replace /tests/unit/example.spec.ts with:

import { mount, createLocalVue } from "@vue/test-utils";
import Vuetify from "vuetify";
import HelloWorld from "../../src/components/HelloWorld.vue";

const localVue = createLocalVue();
localVue.use(Vuetify);

describe("HelloWorld", () => {
  it("Mount", () => {
    const wrapper = mount(HelloWorld, { localVue });
    expect(wrapper.contains("v-date-picker")).toBeTruthy();
  });
});

Expected Behavior

Test passes

Actual Behavior

HelloWorld › Mount TypeError: Cannot read property ‘rtl’ of undefined

Reproduction Link

https://codesandbox.io/s/l2jzlrq5zl

Other comments

This only works on a local machine, cannot be reproduced on codesandbox or other platform.

[KaelWD]

Duplicate of #4861

localVue.use(Vuetify) breaks things.

[misterabd]

@Stoom The error refers to not being able to find ‘rtl’ on ‘undefined’ i.e. $vuetify so stubbing ‘rtl’ would have no effect as in the stack trace the problem stems from the instance of $vuetify not being able to play nice with the localVue constructor.

I’ve imported Vue to only use it with Vuetify and build the remainder of the tests with localVue:

Vue.use(Vuetify)
localVue.use(Vuex)

This takes care of this problem. Similar feedback here https://github.com/vuejs/vue-test-utils/issues/1087#issuecomment-451553965