Vue Js: Use directive in component with vue-loader

I'm using vue-loader and I'm facing a problem because I have created a directive in the main app.js to use in a component but is not possible to use that directive in the component.

I'm receiving this message:

vue.common.js?e881:1014 [Vue wa]: Failed to resolve directive: swiper (found in component: <testimonial-comp>)

app.js

import Vue from 'vue';
import App from './App.vue';

new Vue({
    el: '#app',
    components: { App },
    directives: {
        swiper:  {
            bind: function () {
                console.log('my directive');
          }
        }
    }
});

App.vue

<template lang="jade">
    testimonial-comp
</template>

<script>
    import TestimonialComp from './components/Testimonial.vue'

    export default {
        components: {
            TestimonialComp
        }
    }
</script>

<style lang="stylus" scoped>

</style>

Testimonial.vue

<template lang="jade">
  article#testimonial
    .swiper-container(v-swiper)
      .swiper-wrapper
        .swiper-slide Slide 1
        .swiper-slide Slide 2
        .swiper-slide Slide 3
      .swiper-pagination
      .swiper-button-prev
      .swiper-button-next
      .swiper-scrollbar

</template>

<script>
  import Swiper from 'Swiper/dist/js/swiper.min.js'

</script>
<style lang="stylus">

</style>

I hope you can help me.