What could be the reason for the discrepancy between document.activeElement and the focused element in JSDom while testing a Vue component using Jest?

Currently, I am in the process of testing a Vue.js 2 component using a combination of vue-test-utils and jest. One functionality of this component is that it automatically sets focus to a specific element. When examining JSDom, we expect it to reference this element in the document.activeElement variable. However, even when manually setting focus within the test using

wrapper.find(...).element.focus()
, the active element still only seems to point to the body element.

it('focuses the default option automatically', async () => {
  const wrapper = await mount(component);
  console.log(document.activeElement); // -> <body></body>
  // expect(document.activeElement.value).toBe('none');
});

Answer №1

When component is mounted using vue-test-utils, it does not automatically connect to JSDom. To establish a connection, utilize the attachTo option within the mount() / shallowMount() function.

const wrapper = await mount(component, {
  attachTo: document.body, // ← added!
});

One clue that helped me was an issue found in enzymejs repository: https://github.com/enzymejs/enzyme/issues/2337#issuecomment-586583502

Moreover, concerning focus, certain versions of JSDom may present problems (v16 works correctly for me). In some cases, the tabindex attribute becomes necessary: https://github.com/jsdom/jsdom/issues/2586

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