Add test argument

You can now generate a test by passing the -t argument.

Full demo looks like:

vc Scrollbar --options=created -t

Scrollbar.vue

<template>
  <div>
  </div>
</template>

<script>
  export default {
    name: 'Scrollbar',

    created () {
    }
  }
</script>

<style scoped>
</style>

Scrollbar.test.js

import { shallow } from 'vue-test-utils'
import Scrollbar from './Scrollbar'

describe('Scrollbar', () => {
  it('renders', () => {
    const wrapper = shallow(Scrollbar)
  })
})