How to fix warning when running tests with jest: Failed to mount component: template or render function not defined

Question

I've seen loads of posts about the same error but I'm only getting the it when running tests with Jest:

    console.error node_modules/vue/dist/vue.runtime.common.dev.js:621
      [Vue warn]: Failed to mount component: template or render function not defined.

      found in

      ---> <Navbar>
             <Root>

Navbar.vue

<template>
...
  <div>
    <Image
      v-if="email"
    />
  </div>
</template>
<script>
module.exports = require("./Navbar.ts");
</script>

Navbar.ts

import Vue from "vue";
import Image from "@/components/Image/Image";

export default Vue.extend({
  name: "Navbar",
  components: {
    Image,
  },
  computed: {
    email() {
      return this.$store.getters.email;
    }
  }
});

Navbar.spec.ts example test

import { mount, createLocalVue } from "@vue/test-utils";
import Navbar from "../Navbar";
import Vuex from "vuex";

const localVue = createLocalVue();
localVue.use(Vuex);
let wrapper;
const state = {
  email: "[email protected]"
};
const getters = {
  email: state => state.email
};
const store = new Vuex.Store({ state, getters });

describe("Navbar", () => {
  beforeEach(() => {
    wrapper = mount(Navbar, {
      store,
      localVue
    });
  });

  it("returns correct email from the store", () => {
    expect(wrapper.vm.email).toBe("[email protected]");
  });
});

Tests itself pass. I assume I'm missing/set wrong some configuration but not sure exactly what. I'm also using Typescript.

Jest configuration:

module.exports = {
  displayName: "test",
  roots: ["<rootDir>/src"],
  moduleFileExtensions: ["ts", "tsx", "js", "jsx", "json", "node", "vue"],
  transform: {
    ".*\\.(vue)$": "vue-jest",
    "^.+\\.tsx?$": "ts-jest"
  },
  testURL: "http://localhost/",
  snapshotSerializers: ["<rootDir>/node_modules/jest-serializer-vue"],
  testRegex: "(/__tests__/.*|(\\.|/)(test|spec))\\.tsx?$",
  moduleNameMapper: {
    "^@/(.*)$": "<rootDir>/src/$1"
  }
};

I expect tests to still pass without the console error.

Silva Kirsimäe · Accepted Answer · 2019-07-15 09:58:00Z

2

I resolved the warning by modifying the order of the extensions in moduleFileExtensions to:

moduleFileExtensions: ["js", "jsx", "json", "vue", "ts", "tsx", "node"],

I also needed to use shallowMount instead of mount as I have Image child component that is committing to the Vuex store which I don't want to be executed.

answered Jul 15, 2019 at 9:58

Silva Kirsimäe

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