How to use unit test with vuex-loading

I would like to write a unit test with the async action such as:
**File navigation.spec.js:**
`

import Vue from 'vue'

import Vuex from 'vuex'

import Vuetify from 'vuetify'

import vueLoading from 'vuex-loading'

import { shallow, createLocalVue } from '@vue/test-utils'

import Navigation from '@/components/Navigation'

import { stat } from 'fs';


Vue.use(Vuetify)

Vue.use(vueLoading)

const localVue = createLocalVue()

localVue.use(Vuex)

describe('Navigation', () => {

  let store

  let actions

  let state

  beforeEach(() => {

    state = { 

      items: []

    }

    actions = {

      getAsync: jest.fn()

    }

  

    store = new Vuex.Store({

      state,

      actions

    })

  })

  it('dispatches an getAsync action', () => {

    const wrapper = shallow(Navigation, {

      store,

      localVue

    })

    wrapper.find('button').trigger('click')

    expect(actions.getAsync).toHaveBeenCalled()

  })

})

**File Navigation.vue:**
`

  


    

      

        Loading...

      

      Call ajax

    

    
call ajax...

    


      


        {{ item.title }} 


        {{ item.body }}

      

    

  


import { mapState, mapActions } from 'vuex'

export default {

  name: 'RecipeNavigation',

  computed: {

    ...mapState(['items'])

  },

  methods: {

    ...mapActions(['getAsync']),

    fetchResults () {

      this.getAsync()

    },

    onClose () {

      this.$emit('close', this.$el)

    }

  }

}

**The result of test:**
[Vue warn]: Error in config.errorHandler: "TypeError: Cannot read property 'isLoading' of undefined"

Please help me to pass this issue. Thank you for any help you can offer