vuejs unit test a component which has a child component - unit-testing

Question

I want to test a TheLogin.vue component that has a child BaseInput.vue component. I tried the code below and also shallowMount but I keep getting the error below.
TheLogin.vue
<template>
<section>
<legend>
Hello Login
</legend>
<BaseInput id="userName"></BaseInput>
</section>
</template>
export default {
name: 'TheLogin',
data() {
return {
userName: null
}
}
}
TheLogin.spec.js
import TheLogin from '#/pages/login/TheLogin.vue';
import BaseInput from '#/components/ui/BaseInput.vue';
import { createLocalVue, mount } from '#vue/test-utils';
describe('TheLogin.vue', () => {
const localVue = createLocalVue();
localVue.use(BaseInput); // no luck
it('renders the title', () => {
const wrapper = mount(TheLogin, {
localVue,
// stubs: {BaseInput: true // no luck either
// stubs: ['base-input'] // no luck again
});
expect(wrapper.find('legend').text()).toEqual(
'Hello Login'
);
});
I import my base components in a separate file which I import into my main.js
import Vue from 'vue';
const components = {
BaseInput: () => import('#/components/ui/BaseInput.vue'),
BaseButton: () => import('#/components/ui/BaseButton.vue'),
//et cetera
};
Object.entries(components).forEach(([name, component]) =>
Vue.component(name, component)
);
The error I'm getting is:
TypeError: Cannot read property 'userName' of undefined
UPDATE
Turned out it was Vuelidate causing the error (the code above was not complete). I also had in my script:
validations: {
userName: {
required,
minLength: minLength(4)
},
password: {
required,
minLength: minLength(4)
}
}
I solved it by adding in my test:
import Vuelidate from 'vuelidate';
import Vue from 'vue';
Vue.use(Vuelidate);

Answer 1

Have you tried to shallow mount the component without using localVue and setting BaseInput as a stub?
Something like:
import TheLogin from '#/pages/login/TheLogin.vue';
import { shallowMount } from '#vue/test-utils';
describe('TheLogin.vue', () => {
it('renders the title', () => {
const wrapper = shallowMount(TheLogin, {
stubs: { BaseInput: true }
});
expect(wrapper.find('legend').text()).toEqual(
'Hello Login'
);
});
});