Jest Version 24.9.0

Steps to reproduce

1. I am using vue@2.6.14, @vue/cli-service@4.5.18 , jest@24.9.0, @vue/cli-plugin-unit-jest@4.5.18 , typescript@3.9.10
2. Previously I was using node 14 and esnext. Jest Coverage was working fine, there was no issues
3. Later I updated node 14 to 16 and esnext to es2019 and configured snapshots as well, then lost my coverage. Then reverted my changes, still facing coverage issue.

Even if any tests failed, its giving 100% coverage

Jest Configuration :

collectCoverageFrom: ["src/**/*.vue"]

"test:unit": "npm run requirements-check && vue-cli-service test:unit --colors --coverage --maxWorkers=4 -u"

Node: 14.15.4 npm: 6.14.10

Sample testcase (its enough to get 100% coverage even file has multiple functions) :

describe("Can able to see page is mounted", () => {
  let i18n: VueI18n;
  let localVue: VueConstructor<Vue>;
  let routerMock: any;
  let wrapper: Wrapper<test& {
    [key: string]: any;
   }>;

beforeEach(() => {
    localVue = createLocalVue();
    localVue.use(plugins);
    localVue.use(VueI18n);
    localVue.prototype.$notify = jest.fn();
    localVue.config.ignoredElements = [/vl*/];

    window.scrollTo = jest.fn();

    routerMock = {
        $router: {
        replace: jest.fn(),
        push: jest.fn(),
        go: jest.fn()
      }
    };

    wrapper = mount(test, {
      i18n,
      localVue,
      mocks: routerMock,
      directives: {
        "full-screen-loading": jest.fn()
      },
      stubs: ["router-link", "router-view"]
    });
  });

  it("test", () => {
     expect(wrapper.exists()).toBe(true);
     expect(wrapper.find(".test").exists()).toBe(true);
     expect(wrapper.element).toMatchSnapshot();
  });
});