Testing VueJS component containing other components written by myself

Question

I work on a website with multiple components that contain other components. Now I would like to test if the save button of a form is deactivated correctly if no data is set. I am using vuetify for the UI and Jest for testing.

Here is my parent component, containing the edit-user-details component:

    <template>
    <v-container>
        <v-form v-model="valid">
            <v-card>
                <v-card-text>
                    <edit-user-details :user="user"></edit-user-details>
                </v-card-text>
                <v-card-actions>
                    <v-btn :disabled="!valid" @click="save()">Save</v-btn>
                    <v-btn @click="cancel()">Cancel</v-btn>
                </v-card-actions>
            </v-card>
        </v-form>
    </v-container>
</template>

<script>
    export default {
        name: "edit-user",
        components: {},
        data: () => ({
            user: {},
            valid: false
        }),
        methods: {
            save() {
                ...
            },
            cancel() {
                ...}
            }
        }
    }
</script>

This is a part of the edit-user-details component:

<template>
    <v-container>
        <v-text-field
                v-model="user.userName"
                label="Username*"
                required
                :rules="[v => !!v || 'Please, enter a user name.']"
        ></v-text-field>
       ...
    </v-container>
</template>

<script>
    export default {
        name: "edit-user-details",
        props: {
            user: {
                type: Object,
                default: () => ({})
            }
        }
    }
</script>

And here we have my test:

import { mount, createLocalVue } from '@vue/test-utils'
import EditUser from '../../src/views/EditUser'
import Vuetify from 'vuetify';
import EditUserDetails from '../../src/components/EditUserDetails'


describe('Edited user data ', () => {

  it('can be saved if valid', () => {
      const localVue = createLocalVue();
      localVue.use(Vuetify)
      localVue.use(EditUserDetails)

      const wrapper = mount(EditUser, {
          localVue: localVue
      });

  })
})

The test is green because it has no assert. The main issue is, that I get this error: [Vue warn]: Unknown custom element: - did you register the component correctly? For recursive components, make sure to provide the "name" option.

So my question is: How can I test a component containing other components written by me?

Thank you in advance for your help.

Answer 1

I haven’t tried this together with createLocalVue(), but I hope it'll help:

import Vuetify from 'vuetify'

const vuetify = new Vuetify()

const wrapper = mount(Component, { ..., vuetify })

Answer 2

instead of mount, use shallowMount.

Like mount, it creates a Wrapper that contains the mounted and rendered Vue component, but with stubbed child components.

https://vue-test-utils.vuejs.org/api/#shallowmount