Vue.js Vuetify，用Jest运行我的第一个单元测试的问题

这是我的第一个测试：

Heading.spec.js

    import Vuetify from "vuetify";
    import { shallowMount, createLocalVue } from "@vue/test-utils";
    import router from "@/router";
    import i18n from "@/locales";
    import Heading from "@/components/Home/Heading.vue";

    describe("Heading.vue", () => {
      let wrapper;

      beforeEach(() => {
        const localVue = createLocalVue()
        localVue.use(router)
        localVue.use(Vuetify)
        localVue.filter("translate", function(value) {
          if (!value) return "";
          value = "lang.views.global." + value.toString();
          return i18n.t(value);
        });

        wrapper = shallowMount(Heading, { localVue: localVue, router, i18n });
      });

      it("should contains default heading", () => {
        console.log ('WRAPPER: ', wrapper)
        // const heading = wrapper.find("h1");
        // expect(heading.text()).toContain("In the heart of Charentes...");
      });
    });

当我运行它时，出现Vuetify错误...

console.log

    vue-cli-service test:unit

     PASS  tests/unit/Heading.spec.js (11.247s)
      Heading.vue
        ✓ should contains default heading (462ms)

      console.log tests/unit/Heading.spec.js:23
        WRAPPER:  undefined

      console.error node_modules/vuetify/dist/vuetify.js:19429
        [Vuetify] Multiple instances of Vue detected
        See https://github.com/vuetifyjs/vuetify/issues/4068

        If you're seeing "$attrs is readonly", it's caused by this

      console.error node_modules/vuetify/dist/vuetify.js:19429
        [Vuetify] Multiple instances of Vue detected
        See https://github.com/vuetifyjs/vuetify/issues/4068

        If you're seeing "$attrs is readonly", it's caused by this

      console.error node_modules/vue/dist/vue.runtime.common.js:589
        [Vue warn]: Invalid prop: type check failed for prop "src". Expected String, got Object.

        found in

        ---> <VParallax>
               <Heading>
                 <Root>

    Test Suites: 1 passed, 1 total
    Tests:       1 passed, 1 total
    Snapshots:   0 total
    Time:        17.641s
    Ran all test suites.

为什么我会检测到多个Vue实例？在我的测试中定义了一次……就这些了？

测试通过了，但是我不理解Vuetify的错误..感谢您的反馈