No doubt that Suspense feature leads to a cleaner code base, but as tidy as it is, it turns to be hard to test. Specifically it is not well documented yet.
Regular app generated by VUE CLI
I made use of Suspense component as recommended as follows:
<RouterView name="default" v-slot="{ Component, route }">
<transition :name="route.meta.transition" mode="out-in" :duration="300" :key="route.path">
<Suspense >
<template #default>
<component :is="Component" :key="route.path"/>
</template>
<template #fallback>
<div class="top-0 right-0 h-screen w-screen z-50 flex justify-center items-center">
<div class="animate-spin rounded-full h-32 w-32 border-t-2 border-b-2 border-yellow-700"></div>
</div>
</template>
</Suspense>
</transition>
</RouterView>
// here is the gotcha, if ever I removed async from setup the test runs well otherwise it always returns empty vm.
async setup(){
const router = useRouter()
const route = useRoute()
const form = reactive(new Form({
username:'',
password:'',
}))
}
test('Shows login form', async () => {
let wrapper = mount(Login,{
// tried set global.stubs.transition to false
renderDefaultSlot: true // tried as well to move this attr to beforeEach hook
})
expect(wrapper.exists()).toBe(true) // passes
await nextTick()
// tried to flushPromises()
console.log(wrapper.vm) // always empty object {}
expect(wrapper.findAll('div')).toBeTruthy() // fails accordingly as it can't run helper methods to get the parentElement
})
All open discussions on Github shows that I am not the only one stumbled on this issue, but for now it is just a discussion.
https://github.com/vuejs/vue-test-utils-next/issues/108#issue-611802592
After investigation wrote a little helper quoted from Github discussion above:
import {defineComponent,h,Suspense } from 'vue'
import { mount } from '@vue/test-utils'
import flushPromises from 'flush-promises';
const mountSuspense = async (component, options) => {
const wrapper = mount(defineComponent({
render() {
return h(Suspense, null, {
default: h(component),
fallback: h('div', 'fallback')
})
}}), ...options)
await flushPromises()
return wrapper
}
describe('App renderes', ()=>{
test('About page renders',async()=>{
const wrapper = await mountSuspense(About)
await console.log(wrapper.text()) // it works
})
})
options not is a iterable, remove spread.
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