Struggling with creating unit tests using Jest for Vue 3 components that utilize useRoute()? Take a look at the code snippet below:
<template>
<div :class="{ 'grey-background': !isHomeView }" />
</template>
<script lang="ts">
import { defineComponent, computed } from 'vue';
import { useRoute } from 'vue-router';
export default defineComponent({
setup: () => {
const isHomeView = computed(() => {
return useRoute().name === 'Home';
});
return {
isHomeView,
};
},
});
</script>The component's computed property calls useRoute(), and this causes issues when writing Jest tests. The error message "TypeError: Cannot read property 'name' of undefined" is commonly encountered.
Attempts to mock useRoute by doing
jest.mock('vue-router', () => ({ useRoute: jest.fn() }))useRoute.mockReturnValueOnce({ name: 'Home' })beforeEach have not yielded successful results.
This problem specifically relates to Vue 3 and its routing system, as opposed to the behavior in Vue 2.