options.md

Mounting Options

Options for mount and shallowMount.

:::tip Aside from the options documented below, the options object can contain any option that would be valid in a call to new Vue ({ /*options here*/ }). These options will be merged with the component's existing options when mounted with mount / shallowMount

See other options for examples :::

• context
• slots
• scopedSlots
• stubs
• mocks
• localVue
• attachToDocument
• propsData
• attrs
• listeners
• parentComponent
• provide
• sync

context

• type: Object

Passes context to functional component. Can only be used with functional components.

Example:

import Foo from './Foo.vue'
import Bar from './Bar.vue'

const wrapper = mount(Component, {
  context: {
    props: { show: true },
    children: [Foo, Bar]
  }
})

expect(wrapper.is(Component)).toBe(true)

slots

• type: { [name: string]: Array<Component>|Component|string }

Provide an object of slot contents to the component. The key corresponds to the slot name. The value can be either a component, an array of components, or a template string, or text.

Example:

import Foo from './Foo.vue'

const bazComponent = {
  name: 'baz-component',
  template: '<p>baz</p>'
}

const wrapper = shallowMount(Component, {
  slots: {
    default: [Foo, '<my-component />', 'text'],
    fooBar: Foo, // Will match `<slot name="FooBar" />`.
    foo: '<div />',
    bar: 'bar',
    baz: bazComponent,
    qux: '<my-component />'
  }
})

expect(wrapper.find('div')).toBe(true)

scopedSlots

• type: { [name: string]: string|Function }

Provide an object of scoped slots to the component. The key corresponds to the slot name.

You can set the name of the props using the slot-scope attribute:

shallowMount(Component, {
  scopedSlots: {
    foo: '<p slot-scope="foo">{{foo.index}},{{foo.text}}</p>'
  }
})

Otherwise props are available as a props object when the slot is evaluated:

shallowMount(Component, {
  scopedSlots: {
    default: '<p>{{props.index}},{{props.text}}</p>'
  }
})

You can also pass a function that takes the props as an argument:

shallowMount(Component, {
  scopedSlots: {
    foo: function(props) {
      return this.$createElement('div', props.index)
    }
  }
})

Or you can use JSX. If you write JSX in a method, this.$createElement is auto-injected by babel-plugin-transform-vue-jsx:

shallowMount(Component, {
  scopedSlots: {
    foo(props) {
      return <div>{props.text}</div>
    }
  }
})

stubs

• type: { [name: string]: Component | boolean } | Array<string>

Stubs child components. Can be an Array of component names to stub, or an object. If stubs is an Array, every stub is <${component name}-stub>.

Example:

import Foo from './Foo.vue'

mount(Component, {
  stubs: ['registered-component']
})

shallowMount(Component, {
  stubs: {
    // stub with a specific implementation
    'registered-component': Foo,
    // create default stub.
    // the component name of default stub is another-component in this case.
    // the default stub is <${the component name of default stub}-stub>.
    'another-component': true
  }
})

mocks

• type: Object

Add additional properties to the instance. Useful for mocking global injections.

Example:

const $route = { path: 'http://www.example-path.com' }
const wrapper = shallowMount(Component, {
  mocks: {
    $route
  }
})
expect(wrapper.vm.$route.path).toBe($route.path)

localVue

• type: Vue

A local copy of Vue created by createLocalVue to use when mounting the component. Installing plugins on this copy of Vue prevents polluting the original Vue copy.

Example:

import { createLocalVue, mount } from '@vue/test-utils'
import VueRouter from 'vue-router'
import Foo from './Foo.vue'

const localVue = createLocalVue()
localVue.use(VueRouter)

const routes = [{ path: '/foo', component: Foo }]

const router = new VueRouter({
  routes
})

const wrapper = mount(Component, {
  localVue,
  router
})
expect(wrapper.vm.$route).toBeInstanceOf(Object)

attachToDocument

• type: boolean
• default: false

Component will be attached to DOM when rendered if set to true.

When attaching to the DOM, you should call wrapper.destroy() at the end of your test to remove the rendered elements from the document and destroy the component instance.

attrs

• type: Object

Set the component instance's $attrs object.

propsData

• type: Object

Set the component instance's props when the component is mounted.

Example:

const Component = {
  template: '<div>{{ msg }}</div>',
  props: ['msg']
}
const wrapper = mount(Component, {
  propsData: {
    msg: 'aBC'
  }
})
expect(wrapper.text()).toBe('aBC')

::: tip It's worth noting that propsData is actually a Vue API, not a Vue Test Utils mounting option. It is processed through extends. Please see Other options. :::

listeners

• type: Object

Set the component instance's $listeners object.

parentComponent

• type: Object

Component to use as parent for mounted component.

Example:

import Foo from './Foo.vue'

const wrapper = shallowMount(Component, {
  parentComponent: Foo
})
expect(wrapper.vm.$parent.$options.name).toBe('foo')

provide

• type: Object

Pass properties for components to use in injection. See provide/inject.

Example:

const Component = {
  inject: ['foo'],
  template: '<div>{{this.foo()}}</div>'
}

const wrapper = shallowMount(Component, {
  provide: {
    foo() {
      return 'fooValue'
    }
  }
})

expect(wrapper.text()).toBe('fooValue')

sync

• type: boolean
• default: true

When sync is true, the Vue component is rendered synchronously.
When sync is false, the Vue component is rendered asynchronously.

Other options

When the options for mount and shallowMount contain the options other than the mounting options, the component options are overwritten with those using extends.

const Component = {
  template: '<div>{{ foo() }}{{ bar() }}{{ baz() }}</div>',
  methods: {
    foo() {
      return 'a'
    },
    bar() {
      return 'b'
    }
  }
}
const options = {
  methods: {
    bar() {
      return 'B'
    },
    baz() {
      return 'C'
    }
  }
}
const wrapper = mount(Component, options)
expect(wrapper.text()).toBe('aBC')